Библиотека института физики им. Л.В. Киренского СО РАН

Главная

Базы данных

Труды сотрудников ИФ СО РАН - результаты поиска

Вид поиска

Каталог книг и брошюр библиотеки ИФ СО РАН

Каталог журналов библиотеки ИФ СО РАН

Труды сотрудников ИФ СО РАН

Область поиска

в найденном

Найдено в других БД:

Каталог книг и брошюр библиотеки ИФ СО РАН (28)

Формат представления найденных документов:
полный	информационный	краткий

Отсортировать найденные документы по:
автору	заглавию	году издания	типу документа

Поисковый запрос: (<.>K=Functions<.>)

Общее количество найденных документов : 62
Показаны документы с 1 по 20

Two-dimensional hexagonal CrN with promising magnetic and optical properties: A theoretical prediction / A. V. Kuklin [et al.] // Nanoscale. - 2017. - Vol. 9, Is. 2. - P. 621-630, DOI 10.1039/c6nr07790k. - Cited References: 76. - We acknowledge the Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk; the Institute of Computational Modeling of SB RAS, Krasnoyarsk; the Joint Supercomputer Center of RAS, Moscow; and the ICC of Novosibirsk State University for providing the computing resources. This work was supported by the government contract of the Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant No. 16.1500.2014/K). P. V. A. acknowledges the Kyungpook National University Research Fund, 2014. N. S. M. acknowledges the Russian Foundation for Basic Research (RFBR 16-32-60003 mol_a_dk). . - ISSN 2040-3364
Кл.слова (ненормированные):
Boron nitride -- Calculations -- Energy gap -- Ferromagnetic materials -- Ferromagnetism -- Graphene -- Magnetism -- Metals -- Transition metals -- Transparency -- Dielectric functions -- Ferromagnetic orderings -- First-principles calculation -- Half-metallic properties -- Magnetic and optical properties -- Optical transparency -- Spintronics application -- Transition metal dichalcogenides -- Optical properties
Аннотация: Half-metallic ferromagnetic materials with planar forms are promising for spintronics applications. A wide range of 2D lattices like graphene, h-BN, transition metal dichalcogenides, etc. are non-magnetic or weakly magnetic. Using first principles calculations, the existence of graphene-like hexagonal chromium nitride (h-CrN) with an almost flat atomically thin structure is predicted. We find that freestanding h-CrN has a 100% spin-polarized half-metallic nature with possible ferromagnetic ordering and a high rate of optical transparency. As a possible method for stabilization and synthesis, deposition of h-CrN on 2D MoSe2 or on MoS2 is proposed. The formation of composites retains the half-metallic properties and leads to the reduction of spin-down band gaps to 1.43 and 1.71 eV for energetically favorable h-CrN/MoSe2 and h-CrN/MoS2 configurations, respectively. Calculation of the dielectric functions of h-CrN, h-CrN/MoSe2 and h-CrN/MoS2 exhibit the high transparency of all three low-dimensional nanomaterials. The honeycomb CrN may be considered as a promising fundamental 2D material for a variety of potential applications of critical importance. © The Royal Society of Chemistry 2017.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation
Department of Chemistry, Kyungpook National University, 80 Daehakro Bukgu, Daegu, South Korea
L.V. Kirensky Institute of Physics, 50/38 Akademgorodok, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kuklin, A. V.; Куклин, Артем Валентинович; Kuzubov, A. A.; Кузубов, Александр Александрович; Kovaleva, E. A.; Mikhaleva, N. S.; Tomilin, F. N.; Томилин, Феликс Николаевич; Lee, H.; Avramov, P. V.
}
Найти похожие

Transport properties of HTSC plus Ba(Pb, Met)O-3 composites as functions of the electrical and magnetic characteristics of nonsuperconducting components / M. I. Petrov [et al.] // Phys. Solid State. - 2000. - Vol. 42, Is. 5. - P. 810-815, DOI 10.1134/1.1131294. - Cited References: 27 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   CURRENT-VOLTAGE CHARACTERISTICS
   NORMAL-METAL LAYER
   WEAK LINKS
   JUNCTIONS
   SCATTERING
   BAPB1-XBIXO3
   TRANSITION
   IMPURITIES
   BREAKING
Аннотация: Composites simulating a network of weak metallic links and consisting of a classic 1-2-3 HTSC and a BaPbO3 metal oxide with incorporated Sn, Ni, and Fe impurities have been prepared. Experimental resistivity, magnetic, and Mossbauer studies of the BaPb(0.9)Met(0.1)O(3) nonsuperconducting components are presented. The transport properties of the HTSC + BaPb(0.9)Met(0.1)O(3) composites have been investigated. The superconducting properties of the composites are observed to be suppressed, both when the carrier mean free path in nonsuperconducting components with tin impurities decreases, and as a result of an additional interaction of the magnetic moments of (Fe, Ni) impurities with the spins of supercurrent carriers. The experimental temperature dependences of the composite critical current are analyzed in terms of the de Gennes theory for the superconductor-normal metal-superconductor structures. (C) 2000 MAIK "Nauka/Interperiodica".

WOS,
Scopus,
Читать в сети ИФ
Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Ospishchev, S. V.; Оспищев С. В.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
Найти похожие

Zobov, V. E.
The coordinate of the singular point of generating functions of clusters in the high-temperature dynamics of spin lattice systems with axially symmetric interaction / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2003. - Vol. 136, Is. 3. - P. 1297-1311, DOI 10.1023/A:1025603416535. - Cited References: 25 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
CONSISTENT FLUCTUATING FIELD
   NUCLEAR-DOUBLE-RESONANCE
   HEISENBERG PARAMAGNET
   LINE SHAPE
   RELAXATION
   SPECTRUM
   APPROXIMATION
   CRYSTALS
   MOMENT
   CAF2
Кл.слова (ненормированные):
spin dynamics -- singular points -- expansion over the reciprocal space dimension -- Expansion over the reciprocal space dimension -- Singular points -- Spin dynamics
Аннотация: We investigate generating functions for equipped trees composed of double bonds of two sorts on a hypercubic lattice of dimension d with built-in fragments. Rules for constructing these clusters are chosen to ensure the estimate for coefficients of power series in time for the longitudinal and transverse autocorrelation functions of the spin system with axially symmetric interaction. We derive a system of two equations for the tree-generating functions and an equation for the generating functions of chains leading from the root to a fragment in a tree using the Bethe approximation and under the condition that mainly bonds of one sort are taken into account. For the face-centered hypercubic lattice, we find the First terms of the 1/d expansion for the coordinate of the singular point of the generating function in both the anisotropic and the isotropic cases taking fragments in the forms of a triangle from four bonds and a four-fold bound pair into account. The obtained result is written in terms of ratios of lattice sums and is generalized to nuclear spin systems with dipole-dipole interaction. The theoretical value of the singular-point coordinate agrees well with the experimental value calculated from the tail of the absorption spectrum of the nuclear magnetic resonance in a barium fluoride monocrystal.

WOS,
Scopus,
Читать в сети ИФ
Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Novosibirsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, RAS, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
}
Найти похожие

Zobov, V. E.
The coordinate of a singular point of the time correlation functions for a heteronuclear spin system of a crystal / V. E. Zobov, M. A. Popov // J. Exp. Theor. Phys. - 2005. - Vol. 100, Is. 4. - P. 775-783, DOI 10.1134/1.1926438. - Cited References: 24 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
FLUCTUATION SPECTRUM
   CROSS-RELAXATION
   NMR ABSORPTION
   SHAPE
   WINGS
   LINE
Кл.слова (ненормированные):
Correlation methods -- Crystal lattices -- Crystallography -- Functions -- Integral equations -- Lithium compounds -- Nuclear magnetic resonance -- Quantum theory -- Random processes -- Autocorrelation functions (ACF) -- Dipole-dipole interactions (DDI) -- Heteronuclear spin systems -- Self-consistent fluctuating field (SCFF) -- Crystals
Аннотация: The singularities of the time autocorrelation functions (ACFs) for a heteronuclear spin system of a crystal are investigated. Exact expressions are obtained for ten moments of the spectra of ACFs in the approximation of a self-consistent fluctuating field (SCFF) with arbitrary axial symmetry. These expressions are applied to determine the coordinate of the lowest singular point of these functions on the imaginary-time axis for a spin system with a dipole-dipole interaction (DDI). The leading corrections to this coordinate due to the correlation of local fields in real crystals are calculated. These corrections are determined by lattice sums with triangles of four bonds and pairs of four bonds. Numerical values of the coordinate are obtained for a LiF crystal in a magnetic field directed along three crystallographic axes. An increase in the coordinate of the singular point, which follows from the theory and leads to a faster falloff of the wings of the ACF spectra, qualitatively agrees with experiment. © 2005 Pleiades Publishing, Inc.

WOS,
Scopus,
Читать в сети ИФ
Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
}
Найти похожие

Synthesis, crystal structure, and thermodynamic properties of CuSm2Ge2O8 / L. T. Denisova, M. S. Molokeev, Y. F. Kargin [et al.] // Russ. J. Inorg. Chem. - 2021. - Vol. 66, Is. 12. - P. 1817-1821, DOI 10.1134/S0036023621120020. - Cited References: 30. - This work was carried out with partial financial support within the framework of the State assignment for science of the Siberian Federal University, project number FSRZ2020-0013 . - ISSN 0036-0236. - ISSN 1531-8613

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
TEMPERATURE HEAT-CAPACITY
   CU-O
   PREDICTION
   GERMANATES
   GROWTH
Кл.слова (ненормированные):
copper samarium germanate -- crystal structure -- high-temperature heat capacity -- thermodynamic functions
Аннотация: Copper samarium germanate CuSm2Ge2O8 have been synthesized by the ceramic method from CuO, Sm2O3, and GeO2 in air at the final calcination temperature 1273 K (200 h), and its crystal structure has been determined (space group Cm; a = 9.7592(2) Å, b = 15.2608(4) Å, c = 8.2502(2) Å, β = 148.2566(8)°, V = 646.46(3) Å3). The temperature dependence of the molar heat capacity Cp = f(T) measured in the temperature range 350–1000 K shows a maximum at Tmax = 498.5 K caused by the phase transition. Thermodynamic properties have been calculated from experimental data.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ

Публикация на русском языке Синтез, кристаллическая структура и термодинамические свойства CuSm2Ge2O8 [Текст] / Л. Т. Денисова, М. С. Молокеев, Ю. Ф. Каргин [и др.] // Журн. неорг. химии. - 2021. - Т. 66 № 12. - С. 1700-1705

Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Baikov Inst Met & Mat Sci, Moscow 119991, Russia.

Доп.точки доступа:
Denisova, L. T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kargin, Yu F.; Irtyugo, L. A.; Belousova, N., V; Denisov, V. M.; Siberian Federal University [FSRZ2020-0013]
}
Найти похожие

Synthesis, crystal structure, and thermal properties of substituted titanates Bi2Pr2Ti3O12 and Bi2Nd2Ti3O12 / L. T. Denisova, M. S. Molokeev, N. A. Galiakhmetova [et al.] // Phys. Solid State. - 2021. - Vol. 63. Is. 8. - P. 1159-1164, DOI 10.1134/S1063783421080084. - Cited References: 39. - This study was carried out in part within the state assignment for the Siberian Federal University, project no. FSRZ-2020-0013 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
BI4-XRXTI3O12 R-X
   PHASE-EQUILIBRIA
   HEAT-CAPACITY
   ND
   BI4TI3O12
   PR
Кл.слова (ненормированные):
substituted bismuth titanate -- solid-state synthesis -- crystal structure -- high-temperature heat capacity -- thermodynamic functions
Аннотация: Titanates Bi2Pr2Ti3O12 and Bi2Nd2Ti3O12 have been obtained by the solid-phase synthesis using sequential annealing of the Bi2O3, Nd2O3, Pr6O11, and TiO2 stoichiometric mixtures in air at temperatures of 1003–1323 K. Their crystal structure has been established by X-ray diffractometry and the high-temperature heat capacity has been determined by differential scanning calorimetry. Based on the experimental Cp = f(T) data, the main thermodynamic functions have been calculated.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ

Публикация на русском языке Синтез, кристаллическая структура и теплофизические свойства замещенных титанатов Bi2Pr2Ti3O12 и Bi2Nd2Ti3O12 [Текст] / Л. Т. Денисова, М. С. Молокеев, Н. А. Галиахметова [и др.] // Физ. тверд. тела. - 2021. - Т. 63 Вып. 8. - С. 1056-1061

Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Denisova, L. T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Galiakhmetova, N. A.; Denisov, V. M.; Vasil'ev, G. V.; [FSRZ-2020-0013]
}
Найти похожие

Bulgakov, E. N.
Statistics of wave functions and currents induced by spin-orbit interaction in chaotic billiards / E. N. Bulgakov, A. F. Sadreev // Phys. Rev. E. - 2004. - Vol. 70, Is. 5. - Ст. 56211, DOI 10.1103/PhysRevE.70.056211. - Cited References: 33 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
HELMHOLTZ-EQUATION
   PERSISTENT CURRENTS
   ELECTRON-GAS
   RINGS
   EIGENFUNCTIONS
   SYSTEMS
   PHASE
Кл.слова (ненормированные):
Approximation theory -- Chaos theory -- Degrees of freedom (mechanics) -- Eigenvalues and eigenfunctions -- Electric field effects -- Electric potential -- Electron gas -- Hamiltonians -- Heterojunctions -- Microwaves -- Statistical methods -- Chaotic Robnik billiards -- Current distributions -- Spin-orbit interaction (SOI) -- Wave functions -- Quantum theory
Аннотация: We show that the wave function and current statistics in chaotic Robnik billiards crucially depend on the constant of the spin-orbit interaction (SOI). For small constant the current statistics is described by universal current distributions derived for slightly opened chaotic billiards [Saichev et al. J. Phys. A. 35, L87 (2002)] although one of the components of the spinor eigenfunctions is not universal. For strong SOI both components of the spinor eigenstate are complex random Gaussian fields. This observation allows us to derive the distributions of spin-orbit persistent cut-rents which well describe numerical statistics. For intermediate values of the statistics of the eigenstates and currents, both are deeply nonuniversal.

WOS,
Scopus,
Читать в сети ИФ
Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Astafev Krasnoyarsk Pedag Univ, Lebedeva 660049 89, Russia
Linkoping Univ, IFM, S-58183 Linkoping, Sweden
ИФ СО РАН
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
Astaf'ev Krasnoyarsk Pedagogical U., 660049, Lebedeva, 89, Russian Federation
IFM, Linkoping University, S-581 83 Linkoping, Sweden

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
}
Найти похожие

Aplesnin, S. S.
Static and dynamic magnetic properties of coupled spin-1/2 antiferromagnetic chains / S. S. Aplesnin // J. Phys.: Condens. Matter. - 2000. - Vol. 12, Is. 37. - P. 8191-8207, DOI 10.1088/0953-8984/12/37/316. - Cited References: 21 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
ONE-DIMENSIONAL ANTIFERROMAGNETS
   SYSTEMS
   SUSCEPTIBILITY
   EXCITATIONS
   SR2CUO3
   CA2CUO3
   KCUF3
Кл.слова (ненормированные):
Computational methods -- Copper compounds -- Correlation methods -- Functions -- Magnetic field effects -- Magnetic properties -- Magnetization -- Monte Carlo methods -- Quantum theory -- Specific heat -- Thermal effects -- Excitation spectroscopy -- Interchain coupling -- Intrachain couplings -- Mean-field approximation -- Spin-spin correlation function -- Spinons -- Antiferromagnetic materials
Аннотация: Calculations of the thermodynamic quantities, and the spectra of spinons, triplet excitations, and two-particle spin-singlet (Delta S-z = 0, +/- 1) excitations for a weakly coupled antiferromagnetic S = 1/2 spin chain are made using a mean-field approximation for the interchain couplings (J(2)) by the quantum Monte Carlo method. The mass gaps in these excitation spectra are estimated as functions of the interchain coupling. The critical held H-c, and the temperatures at which the spinon and singlet gaps close (T-1 and T-2, respectively) are obtained. Some peculiarities of the staggered magnetization, the specific heat, and the spin-spin correlation function are found at T-1 = 0.9J(2), T-2 = 1.5J(2), H-c = 3.8J(2), as determined by linear function fitting for J(2)/J(1) < 0.15 The intrachain and interchain couplings, and the staggered magnetization for KCuF3, Sr2CuO3, and Ca2CuO3 are estimated, and mass gaps are predicted to exist in the spectra of the spinons and the singlet two-particle excitations.

WOS,
Scopus,
Читать в сети ИФ
Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Br. Russ. Acad. of Sci., Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
Найти похожие

Spin fluctuation renormalizations of normal and superconducting state properties in t-J*-model / V. V. Val'kov, A. A. Golovnya // J. Phys. Conf. Ser. - 2010. - Vol. 200, Is. SECTION 1, DOI 10.1088/1742-6596/200/1/012050 . - ISSN 1742-6588
Кл.слова (ненормированные):
Critical temperatures -- Electron concentration -- Hubbard -- Hubbard operators -- Joint effect -- Normal phase -- One-loop approximation -- Order parameter -- Renormalization -- Scattering process -- Strongly correlated electrons -- Superconducting phase -- Superconducting state -- Distribution functions -- Mathematical operators -- Superconductivity -- Spin fluctuations
Аннотация: The effect of spin-fluctuation scattering processes on the region of the superconducting phase in the strongly correlated electrons (Hubbard fermions) has been investigated by the diagram technique for Hubbard operators. It is shown that spin fluctuations in the one-loop approximation for the t - t? - t? - J*- model taking into account long-range hoppings and three-center interactions are reflected by components of the strength operator. In this approximation for the d-type symmetry of the order parameter for the superconducting phase a system of infinite integral equations has been derived. Obtained dependencies of critical temperature on the electron concentrations show that joint effect of long-range hoppings, three-center interactions, and dynamical spin-fluctuation processes leads to strong renormalization of the superconducting phase region. It was shown that these processes essentially modify distribution functions of Hubbard fermions in normal phase. © 2010 IOP Publishing Ltd.

Scopus,
eLibrary
Держатели документа:
Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Val'kov, V.V.; Golovnya, A.A.
}
Найти похожие

10.

    Val'kov, V. V.
    Spectral representations and description of a superconducting state with S-type order parameter Delta(k) / V. V. Val'kov, D. M. Dzebisashvili, A. S. Kravtsov // JETP Letters. - 2003. - Vol. 77, Is. 9. - P. 505-509, DOI 10.1134/1.1591980. - Cited References: 11 . - ISSN 0021-3640
Рубрики:
GREENS FUNCTIONS
   MODEL
Аннотация: The inclusion of a singular contribution to the spectral intensity of the anomalous correlation function is shown to regain the sum rule and remove the unjustified forbidding of the S-symmetry order parameter in superconductors with strong correlations. For the order parameter of this symmetry, the solution to the self-consistency equation is analyzed beyond the nearest-neighbor approximation. (C) 2003 MAIK "Nauka / Interperiodica".

WOS,
Scopus,
Читать в сети ИФ

Публикация на русском языке Вальков, Валерий Владимирович. Спектральные представления и проблема описания сверхпроводящего состояния с S-типом симметрии параметра порядка Δ(k) [Текст] / В. В. Вальков, Д. М. Дзебисашвили, А. С. Кравцов // Письма в "Журн. эксперим. и теор. физ.". - 2003. - Т. 77 Вып. 9. - С. 604-608

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk, 660074, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Kravtsov, A. S.; Вальков, Валерий Владимирович
}
Найти похожие

11.

Ovchinnikov, S. G.
Spectral functions in the Hubbard model with half-filling / S. G. Ovchinnikov, E. I. Shneider // Phys. Solid State. - 2004. - Vol. 46, Is. 8. - P. 1469-1473, DOI 10.1134/1.1788780. - Cited References: 8. - This study was supported by the program “Strongly Correlated Electrons” (Department of Physical Sciences, Russian Academy of Sciences) . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: Under the assumption of long-range antiferromagnetic order at low temperatures, the spectral functions and the density of states are calculated in the two-dimensional Hubbard model with half-filling in the Hubbard-I approximation. The results are compared with the data obtained using an exact numerical technique, namely, the quantum Monte Carlo method. The influence of hopping to the next-to-nearest neighbor on the formation of the electronic structure is considered. (C) 2004 MAIK "Nauka / Interperiodica".

WOS,
Scopus,
РИНЦ,
Смотреть статью,
Читать в сети ИФ

Публикация на русском языке Овчинников, Сергей Геннадьевич. Спектральные функции модели Хаббарда в случае половинного заполнения [Текст] / С. Г. Овчинников, Е. И. Шнейдер // Физ. тверд. тела. - 2004. - Т. 46 Вып. 8. - С. 1428-1432

Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Shneider, E. I.; Шнейдер, Елена Игоревна; Kazantsev, A. \пер.\; Овчинников, Сергей Геннадьевич
}
Найти похожие

12.

Zobov, V. E.
Singular points of time-dependent correlation functions of spin systems on large-dimensional lattices at high temperatures / V. E. Zobov // Theor. Math. Phys. - 2000. - Vol. 123, Is. 1. - P. 511-523, DOI 10.1007/BF02551058. - Cited References: 21 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
BRANCHED POLYMERS
   HEISENBERG MAGNET
   EXPANSION
   MODELS
Аннотация: Time-dependent autocorrelation functions are investigated for the Heisenberg model with spins 1/2 on d-dimensional simple cubic lattices of large dimensions d at infinite temperature. The autocorrelation function on the imaginary time axis is interpreted as the generating function of bond trees constructed with double bonds. These trees provide the leading terms with respect to lid for the time-expansion coefficients of the autocorrelation function. The correction terms from branch intersections to the generating function in the Bethe approximation are derived for these trees. A procedure is suggested for finding the correction to the coordinate of the singular point of the generating function (i.e., to the reciprocal of the branch growth-rate parameter) from the above correction terms without calculating the number of trees. The leading correction terms of order 1/sigma(2) (where sigma = 2d - 1) are found for the coordinates of the singular points of the autocorrelation function in question and for the generating function of the trees constructed with single bonds in the Eden model.

WOS,
Scopus,
Читать в сети ИФ
Держатели документа:
RAS, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk, Russia
ИФ СО РАН

Доп.точки доступа:
Зобов, Владимир Евгеньевич
}
Найти похожие

13.

Ignatchenko, V. A.
Self-consistent approximation: Development and application to the problem of waves in inhomogeneous media / V. A. Ignatchenko, D. S. Polukhin, D. S. Tsikalov // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 83-86, DOI 10.1016/j.jmmm.2016.12.058. - Cited References:20. - This work was supported in part by the Complex Program No II.2P (0356-2015-0410) of the SB of the Russian Academy of Sciences. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SUPERCONDUCTING CRITICAL-TEMPERATURE
MIGDALS THEOREM
VERTEX FUNCTION
Кл.слова (ненормированные):
Self-consistent approximation -- Greens functions -- Vertex corrections -- Inhomogeneities -- Correlations -- Dynamic susceptibility
Аннотация: A new self-consistent approximation proposed earlier, is compared with various existing approximations, as well as with a numerical simulation of solutions of the wave equation for a medium with one-dimensional inhomogeneities. The Green's function, found using the new approach, is the closest to the result obtained by the numerical simulation. The results of the work show that the new approach has undoubted advantages in the study of stochastic problems in media with longwave inhomogeneities. The new self-consistent approximation in some cases has advantages over a numerical method: a more rapid process of calculation and the possibility of consideration of three-dimensional problems.

Смотреть статью,
WOS,
Читать в сети ИФ

Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Tsikalov, D. S.; Цикалов, Денис Сергеевич; Игнатченко, Вальтер Алексеевич; SB of the Russian Academy of Sciences [II.2P (0356-2015-0410)]; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
}
Найти похожие

14.

    Muzalevskiy, K. V.
    Retrieving soil moisture profiles based on multifrequency polarimetric radar backscattering observations. Theoretical case study / K. Muzalevskiy // Int. J. Remote Sens. - 2021. - Vol. 42, Is. 2. - P. 506-519, DOI 10.1080/01431161.2020.1809743. - Cited References: 46. - This work was supported by the Russian Foundation for Basic Research (grant No. 18-05-00405) in part of the sensing depth investigation and retrieving soil moisture in the L-band, a technique for measuring moisture profiles at two frequencies of 435 MHz and 5.4 GHz was created in part of SB RAS project No. 0356-2019-0004 . - ISSN 0143-1161
   Перевод заглавия: Восстановление профилей влажности почвы на основе многочастотных поляриметрических наблюдений обратного радарного рассеяния
Кл.слова (ненормированные):
Antennas -- Backscattering -- Cost functions -- Exponential functions -- Inverse problems -- Perturbation techniques -- Polarimeters -- Radar -- Remote sensing -- Soil moisture
Аннотация: In this theoretical work, a dual-frequency polarimetric method is proposed for measuring moisture profiles in the topsoil up to 0.30 m thick. A case of measuring soil moisture profiles, which monotonically changes with depth, during 37 days after irrigation is considered. Original values of backscattering coefficients are calculated by the Oh model and by the small perturbation method at frequencies of 5.4 GHz and 435 MHz, respectively. In these calculations, we used measured moisture profiles and spectroscopic refractive mixing dielectric model of non-saline mineral soil with a clay fraction of 9.1%. Soil moisture profiles are retrieved by solving the inverse problem, the cost function of which is constructed based on the co- and cross-polarized ratios, calculated at two frequencies for the measured and modelled soil moisture profiles. An exponential function is used as a modelled soil moisture profile. It is shown that the standard deviation between the retrieved and measured soil moisture values in the surface layer 0.30 m thick appears to be ≤0.02 m3 m−3 (theoretical limit), and the determination coefficient is 0.881. The study shows a promising path towards developing multi-frequency radar systems for remote sensing of soil moisture profiles using satellites-based and unmanned aerial vehicles air-based platforms.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Laboratory of Radiophysics of the Earth Remote Sensing, Kirensky Institute of Physics Federal Research Center KSC Siberian Branch Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Музалевский, Константин Викторович
}
Найти похожие

15.

KOLOVSKII, A. R.
QUASIENERGY FUNCTIONS OF ELECTRONS IN A SEMICONDUCTOR AFFECTED BY AN EXTERNAL ELECTROMAGNETIC-FIELD / A. R. KOLOVSKII // Phys. Lett. A. - 1990. - Vol. 143, Is. 3. - P. 129-133, DOI 10.1016/0375-9601(90)90663-9. - Cited References: 11 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary

WOS,
Scopus
Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
ИФ СО РАН
}
Найти похожие

16.

Vyunishev, A. M.
Quasi-phase-matched second-harmonic generation in nonlinear crystals with harmonic modulation of nonlinearity / A. M. Vyunishev, V. G. Arkhipkin // Laser Phys. - 2020. - Vol. 30, Is. 4. - Ст. 045401, DOI 10.1088/1555-6611/ab7381. - Cited References: 20 . - ISSN 1054-660X
Кл.слова (ненормированные):
Efficiency -- Harmonic analysis -- Harmonic functions -- Modulation -- Nonlinear optics -- Phase matching -- Photonic crystals -- Harmonic modulations -- Nonlinear photonic crystals -- Periodic oscillation -- Quadratic nonlinearities -- Quasi phase matching -- Quasi-phase-matched -- Rectangular lattices -- Spatial modulations -- Harmonic generation
Аннотация: We propose a new type of nonlinear photonic crystal with the lattice representing a harmonic function of the propagation coordinate. This type of spatial modulation of the quadratic nonlinearity is implemented to enhance the second-harmonic generation (SHG) efficiency. The process resembles that realized in periodic nonlinear photonic crystals with rectangular nonlinearity modulation under quasi-phase-matching. Residual periodic oscillations of the second-harmonic intensity were found. Comparison of the unipolar and bipolar modulations showed that they are equivalent with regard to the oscillations. The SHG efficiency in the harmonic lattices is 1.6 times lower compared with the efficiency corresponding to the quasi-phase-matching in periodic nonlinear photonic crystals with rectangular lattices.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Kirensky Institute of Physics, Federal Research Center Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation
Department of Photonics and Laser Technology, Siberian Federal University, Krasnoyarsk, 660079, Russian Federation

Доп.точки доступа:
Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Вьюнышев, Андрей Михайлович
}
Найти похожие

17.

Quantum stress in chaotic billiards / K. F. Berggren [et al.] // Phys. Rev. E. - 2008. - Vol. 77, Is. 6. - Ст. 66209, DOI 10.1103/PhysRevE.77.066209. - Cited References: 43 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
MICROWAVE CAVITIES
   WAVE-FUNCTIONS
   STATISTICAL PROPERTIES
   SYSTEMS
   FIELDS
Кл.слова (ненормированные):
Computer networks -- Electric fields -- Electroacupuncture -- Electromagnetic field theory -- Electromagnetic fields -- Electromagnetism -- Function evaluation -- Functions -- Gaussian distribution -- Image segmentation -- Magnetism -- Mathematical models -- Microwaves -- Modal analysis -- Nematic liquid crystals -- Numerical analysis -- Random processes -- Stresses -- Tensors -- Trellis codes -- Two dimensional -- Wave functions -- Waves -- abiotic and biotic stress -- e ,2e theory -- p ,p ,t measurements -- American Physical Society (APS) -- Analytic expressions -- Current flowing -- Dinger equation -- Experimental studies -- Gaussian random fields -- net flows -- Plane waves -- Quantum billiards -- Quantum-mechanical (QM) -- Scattering wave functions -- Sinai billiard (SB) -- Statistical distributions -- Stress tensors -- Two-dimensional (2D) -- Chaotic systems
Аннотация: This paper reports on a joint theoretical and experimental study of the Pauli quantum-mechanical stress tensor T(alpha beta)(x,y) for open two-dimensional chaotic billiards. In the case of a finite current flow through the system the interior wave function is expressed as psi=u + iv. With the assumption that u and v are Gaussian random fields we derive analytic expressions for the statistical distributions for the quantum stress tensor components T(alpha beta). The Gaussian random field model is tested for a Sinai billiard with two opposite leads by analyzing the scattering wave functions obtained numerically from the corresponding Schrodinger equation. Two-dimensional quantum billiards may be emulated from planar microwave analogs. Hence we report on microwave measurements for an open two-dimensional cavity and how the quantum stress tensor analog is extracted from the recorded electric field. The agreement with the theoretical predictions for the distributions for T(alpha beta)(x,y) is quite satisfactory for small net currents. However, a distinct difference between experiments and theory is observed at higher net flow, which could be explained using a Gaussian random field, where the net current was taken into account by an additional plane wave with a preferential direction and amplitude.

WOS,
Scopus,
Читать в сети ИФ
Держатели документа:
[Berggren, Karl-Fredrik
Sadreev, Almas F.] Linkoping Univ, IFM Theory & Modeling, S-58183 Linkoping, Sweden
[Maksimov, Dmitrii N.
Sadreev, Almas F.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Hoehmann, Ruven
Kuhl, Ulrich
Stoeckmann, Hans-Joergen] Univ Marburg, Fachbereich Phys, AG Quantenchaos, D-35032 Marburg, Germany
ИФ СО РАН
IFM-Theory and Modeling, Linkoping University, S-581 83 Linkoping, Sweden
L.V. Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
AG Quantenchaos, Fachbereich Physik der Philipps-Universitat Marburg, Renthof 5, D-35032 Marburg, Germany

Доп.точки доступа:
Berggren, K. F.; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Hohmann, R.; Kuhl, U.; Stockmann, H. J.
}
Найти похожие

18.

Kuz'min, E. V.
Quantum spin liquid in the FCC lattice / E. V. Kuz'min // J. Exp. Theor. Phys. - 2003. - Vol. 96, Is. 1. - P. 129-139, DOI 10.1134/1.1545392. - Cited References: 12 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
HEISENBERG-ANTIFERROMAGNET
TRANSITION
Кл.слова (ненормированные):
Antiferromagnetism -- Green's function -- Linear systems -- Magnetic couplings -- Quantum theory -- Thermodynamic properties -- Antiferromagnetic interactions -- Green temperature functions -- Heisenberg model -- Quantum spin liquid -- Spin system -- Spin-wave theory -- Crystal lattices
Аннотация: The properties of the spin system in the FCC lattice described by the Heisenberg model (s=1/2) with antiferromagnetic interactions between the nearest neighbors were studied. It was shown within the framework of spin-wave theory that long-range antiferromagnetic order was absent because of frustration of exchange coupling and transverse quantum spin fluctuations. The system was in the quantum spin liquid state. A method for describing it within linear second-order theory with self-consistently calculated parameters was suggested. It was proved that the ground spin liquid state was singlet. The thermodynamic properties of the spin liquid in the whole temperature range and the character of spatial spin correlations, which had alternating signs and a finite correlation length, were determined. The theory was constructed based on the method of two-time Green temperature functions. (C) 2003 MAIK "Nauka/Interperiodica".

WOS,
Scopus,
Читать в сети ИФ
Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
}
Найти похожие

19.

Ivantsov, I. D.
Quantum Monte Carlo study of the itinerant-localized model of strongly correlated electrons: Spin-spin correlation functions / I. Ivantsov, A. Ferraz, E. Kochetov // Phys. Rev. B. - 2016. - Vol. 94, Is. 23. - Ст. 235118, DOI 10.1103/PhysRevB.94.235118. - Cited References: 15 . - ISSN 1098-0121
Аннотация: We perform quantum Monte Carlo simulations of the itinerant-localized periodic Kondo-Heisenberg model for the underdoped cuprates to calculate the associated spin correlation functions. The strong electron correlations are shown to play a key role in the abrupt destruction of the quasi-long-range antiferromagnetic order in the lightly doped regime. © 2016 American Physical Society.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
L. V. Kyrensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Russian Federation
International Institute of Physics - UFRN, Department of Experimental and Theoretical Physics, UFRN, Natal, Brazil

Доп.точки доступа:
Ferraz, A.; Kochetov, E.; Иванцов, Илья Дмитриевич
}
Найти похожие

20.

Berman, G. P.
Quantum chaos in interactions of multilevel quantum-systems with a coherent radiation-field / G. P. Berman, A. R. Kolovskii // Uspekhi Fiz. Nauk. - 1992. - Vol. 162, Is. 4. - P. 95-141. - Cited References: 36 . - ISSN 0042-1294

РУБ Physics, Multidisciplinary
Рубрики:
QUASIENERGY FUNCTIONS
   RESONANCES
   BEHAVIOR
   OVERLAP
Аннотация: The paper is short review of the papers devoted to the dynamics of the multilevel quantum systems affected by the external periodic field. The main attention is paid to the phenomenon of the quantum nonlinear resonance and the interaction of the two quantum nonlinear resonances, when the dynamics of the system is chaotic in the classical limit. The paper also contains the analysis of some physical systems where these phenomena take place. 30 figs. 37 refs.

WOS

Доп.точки доступа:
Kolovskii, A. R.; Коловский, Андрей Радиевич; Берман, Геннадий Петрович
}
Найти похожие