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1.


   
    Electrical properties of the polycrystalline BiFe0.95Co0.05O3 films / O. B. Romanova, V. V. Kretinin, S. S. Aplesnin [et al.] // Phys. Solid State. - 2021. - Vol. 63. Is. 6. - P. 897-903, DOI 10.1134/S1063783421060184. - Cited References: 34. - This study was supported by the Russian Foundation for Basic Research and the Belarusian Republican Foundation for Basic Research, project no. 20-52-00005 . - ISSN 1063-7834. - ISSN 1090-6460
РУБ Physics, Condensed Matter
Рубрики:
BiFeO3 THIN-FILMS
   PHASE-SEPARATION

   CRYSTAL

   MODEL

Кл.слова (ненормированные):
semiconductor films -- magnetoresistance -- magnetoimpedance -- magnetization
Аннотация: Semiconductor BiFe0.95Co0.05O3 thin-film compounds have been synthesized by a burst technique. The film surface morphology and the effect of electronic doping via substitution of cobalt ions for trivalent iron on the optical, magnetic, and kinetic properties have been investigated in the temperature range of 77-600 K in magnetic fields of up to 12 kOe. Two electron relaxation channels have been found in the impedance spectrum in the frequency range of 0.1-1000 kHz. The negative magnetoresistance in the anomalous magnetization region and the maximum magnetoimpedance in the vicinity of the surface phase transition have been established. Using the Hall measurements, carrier types dominating in the magnetoresistance and magnetoimpedance effects have been determined. The magnetization anomalies have been explained in the model of superparamagnetic clusters and the magnetoresistance, by the carrier scattering by spin fluctuations.

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Публикация на русском языке Электрофизические свойства поликристаллических пленок BiFe0.95Co0.05O3 [Текст] / О. Б. Романова, В. В. Кретинин, С. С. Аплеснин [и др.] // Физ. тверд. тела. - 2021. - Т. 63 Вып. 6. - С. 721-728

Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian State Univ Sci & Technol, Krasnoyarsk 660014, Russia.
Natl Acad Sci Belarus, Sci & Pract Mat Res Ctr, Minsk 220072, BELARUS.

Доп.точки доступа:
Romanova, O. B.; Романова, Оксана Борисовна; Kretinin, V. V.; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Sitnikov, M. N.; Udod, L. V.; Удод, Любовь Викторовна; Yanushkevich, K. I.; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Belarusian Republican Foundation for Basic Research [20-52-00005]
}
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2.


    Muzalevskiy, K. V.
    Application of Sentinel-1B polarimetric observations to soil moisture retrieval using neural networks: Case study for bare Siberian chernozem soil / K. Muzalevskiy, A. Zeyliger // Remote Sens. - 2021. - Vol. 13, Is. 17. - Ст. 3480, DOI 10.3390/rs13173480. - Cited References: 21. - This work was supported by the Russian Foundation for Basic Research (grant No. 19-29-05261 mk). The field experiment and EC-5 Decagon sensor calibration in laboratory conditions were carried out with the support of Ministry of Science and Higher Education of the Russian Federation, project No. 0287-2021-0034 (basic state assignment) . - ISSN 2072-4292
РУБ Environmental Sciences + Geosciences, Multidisciplinary + Remote Sensing + Imaging Science & Photographic Technology
Рубрики:
SURFACE
   MODEL

   PARAMETERS

   ROUGHNESS

   INVERSION

   DUBOIS

   IEM

   OH

Кл.слова (ненормированные):
microwave remote sensing -- Sentinel-1 -- bare soil -- soil moisture -- soil permittivity
Аннотация: Sentinel-1 is currently the only synthetic-aperture radar, which radar measurements of the earth’s surface to be carried out, regardless of weather conditions, with high resolution up to 5–40 m and high periodicity from several to 12 days. Sentinel-1 creates a technological platform for the development of new globally remote sensing algorithms of soil moisture, not only for hydrological and climatic model applications, but also on a single field scale for individual farms in precision farming systems used. In this paper, the potential of soil moisture remote sensing using polarimetric Sentinel-1B backscattering observations was studied. As a test site, the fallow agricultural field with bare soil near the Minino village (56.0865°N, 92.6772°E), Krasnoyarsk region, the Russian Federation, was chosen. The relationship between the cross-polarized ratio, reflectivity, and the soil surface roughness established Oh used as a basis for developing the algorithm of soil moisture retrieval with neural networks (NNs) computational model. Two NNs is used as a universal regression technique to establish the relationship between scattering anisotropy, entropy and backscattering coefficients measured by the Sentinel-1B on the one hand and reflectivity on the other. Finally, the soil moisture was found from the soil reflectivity in solving the inverse problem using the Mironov dielectric model. During the field campaign from 21 May to 25 August 2020, it was shown that the proposed approach allows us to predict soil moisture values in the layer thickness of 0.00–0.05 m with the root-mean-square error and determination coefficient not worse than 3% and 0.726, respectively. The validity of the proposed approach needs additional verification on a wider dataset using soils of different textures, a wide range of variations in soil surface roughness, and moisture.

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Держатели документа:
Russian Acad Sci, Lab Radiophys Earth Remote Sensing, Kirensky Inst Phys, Fed Res Ctr KSC,Siberian Branch, Krasnoyarsk 630090, Russia.
Russian State Agr Univ, Dept Appl Informat, Moscow Timiryazev Agr Acad, Moscow 127550, Russia.

Доп.точки доступа:
Zeyliger, Anatoly; Музалевский, Константин Викторович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-29-05261 mk]; Ministry of Science and Higher Education of the Russian Federation [0287-2021-0034]
}
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3.


   
    Decisive proofs of the s± → s++ transition in the temperature dependence of the magnetic penetration depth / V. A. Shestakov, M. M. Korshunov, Y. N. Togushova, O. V. Dolgov // Supercond. Sci. Technol. - 2021. - Vol. 34, Is. 7. - Ст. 075008, DOI 10.1088/1361-6668/abff6f. - Cited References: 40. - We are grateful to D V Efremov, A S Fedorov, S G Ovchinnikov, E I Shneyder, D Torsello, and A N Yaresko for useful discussions. This work was supported in part by the Russian Foundation for Basic Research (RFBR) Grant No. 19-32-90109 and by RFBR and Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science to the Research Projects 'Electronic correlation effects and multiorbital physics in iron-based materials and cuprates' Grant No. 19-42-240007. . - ISSN 0953-2048. - ISSN 1361-6668
РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
ORDER-PARAMETER
   IMPURITIES

   SUPERCONDUCTORS

   STATES

   MODEL

Кл.слова (ненормированные):
unconventional superconductors -- iron pnictides -- iron chalcogenides -- impurity scattering -- penetration depth
Аннотация: One of the features of the unconventional s± state in iron-based superconductors is possibility to transform to the s++ state with the increase of the nonmagnetic disorder. Detection of such a transition would prove the existence of the s± state. Here we study the temperature dependence of the London magnetic penetration depth within the two-band model for the s± and s++ superconductors. By solving Eliashberg equations accounting for the spin-fluctuation mediated pairing and nonmagnetic impurities in the T-matrix approximation, we have derived a set of specific signatures of the s± → s++ transition: (1) sharp change in the behavior of the penetration depth λL as a function of the impurity scattering rate at low temperatures; (2) before the transition, the slope of ΔλL(T) = λL(T) - λL(0) increases as a function of temperature, and after the transition this value decreases; (3) the sharp jump in the inverse square of the penetration depth as a function of the impurity scattering rate, λL-2(Γa), at the transition; (4) change from the single-gap behavior in the vicinity of the transition to the two-gap behavior upon increase of the impurity scattering rate in the superfluid density ρs(T).

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.
Donostia Int Phys Ctr, San Sebastian 20018, Spain.

Доп.точки доступа:
Shestakov, V. A.; Шестаков, Вадим Андреевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu. N.; Тогушова Ю. Н.; Dolgov, O., V; Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [19-32-90109]; RFBRRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science to the Research Projects 'Electronic correlation effects and multiorbital physics in iron-based materials and cuprates' [19-42-240007]
}
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4.


   
    Unraveling the mechanochemical synthesis and luminescence in MnII-based two-dimensional hybrid perovskite (C4H9NH3)2PbCl4 / G. J. Zhou [et al.] // Sci. China Mater. - 2019. - Vol. 62, Is. 7. - P. 1013-1022, DOI 10.1007/s40843-018-9404-4. - Cited References: 40. - The present work was supported by the National Natural Science Foundation of China (91622125, 51722202 and 51572023) and the Natural Science Foundation of Beijing (2172036), and Molokeev M acknowledges the support of the Russian Foundation for Basic Research (17-52-53031). The DFT calculation was carried out at the National Supercomputer Center in Tianjin, and the calculations were performed on TianHe-1(A). . - ISSN 2095-8226. - ISSN 2199-4501
   Перевод заглавия: Открытие механохимического синтеза и люминесценции в двумерном гибридном перовските (C4H9NH3)2PbCl4 с допированием MnII
РУБ Materials Science, Multidisciplinary
Рубрики:
DOPANT ENERGY-TRANSFER
   EMISSION

   EXCITON

   MODEL

Кл.слова (ненормированные):
2D hybrid perovskite -- mechanochemical -- Mn-doping -- luminescence -- phosphor
Аннотация: The mechanochemical route is a facile and fast way and has received much attention for developing versatile advanced functional materials. Herein, we reported a mechanochemical synthesis for incorporating divalent manganese ions (MnII) into a two-dimensional (2D) hybrid perovskite (C4H9NH3)2PbCl4. The mild external stimuli originating from the grinding at room temperature enabled the formation of MnII-doped 2D hybrid perovskites, and rapidly changed the luminescence characteristics. The photoluminescence analyses show that the violet and orange emissions are attributed to (C4H9NH3)2Pb1–xMnxCl4 band-edge emission and the T1→6A1 transition of Mn2+ resulting from an efficient energy transfer process, respectively. Site preference and distribution of the doped Mn2+ cations on the locations of Pb2+ were analyzed. The formation energy calculated by the density functional theory (DFT) indicates that the Mn2+ ions can rapidly enter the crystal lattice due to the unique 2D crystal structure of the hybrid perovskite. Such a case of mechanochemical synthesis for the 2D hybrid perovskite motivates many novel emerging materials and the related applications.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Beihang Univ, Minist Educ, Sch Phys, Key Lab Micronano Measurement Manipulat & Phys, Beijing 100191, Peoples R China.
RAS, SB, KSC, Lab Crystal Phys,Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Zhou, Guojun; Guo, Shaoqiang; Zhao, Jing; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Quanlin; Zhang, Junying; Xia, Zhiguo
}
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5.


   
    Mossbauer spectroscopy study of the superparamagnetism of ultrasmall ε-Fe2O3 nanoparticles / Y. V. Knyazev [et al.] // JETP Letters. - 2018. - Vol. 108, Is. 8. - P. 527-531, DOI 10.1134/S0021364018200092. - Cited References: 22. - This work was supported by the Russian Science Foundation (project no. 17-12-01111). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
High-temperature
   Particles

   ε-Fe2O3

   Phase

   Model

Аннотация: The superparamagnetism of an ensemble of ϵ-Fe2O3 nanoparticles with a mean size of 3.9 nm dispersed in a xerogel SiO2 matrix is studied by the Mössbauer spectroscopy method. It is shown that most nanoparticles at room temperature are in the superparamagnetic (unblocked) state. As the temperature decreases, the progressive blocking of the magnetic moments of the particles occurs, which is manifested in the Mössbauer spectra as the transformation of the quadrupole doublet into a Zeeman sextet. The analysis of the relative intensity of the superparamagnetic (quadrupole doublet) and magnetically split (sextets) spectral components in the range of 4–300 K provides the particle size distribution, which is in agreement with the transmission electron microscopy data. The values of the effective magnetic anisotropy constants (Keff) are determined, and the contribution of surface anisotropy (KS) is estimated for particles of various sizes. It is shown that the quantity Keff is inversely proportional to the particle size, which indicates the significant contribution of the surface to the magnetic state of the ϵ-Fe2O3 nanoparticles with the size of several nanometers.

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Публикация на русском языке Изучение суперпарамагнетизма ультрамалых наночастиц ε-Fe2O3 методом мессбауэровской спектроскопии [Текст] / Ю. В. Князев [и др.] // Письма в ЖЭТФ. - 2018. - Т. 108 № 7-8. - С. 558-562

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr KSC, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Balaev, D. A.; Балаев, Дмитрий Александрович; Kirillov, V. L.; Bayukov, O. A.; Баюков, Олег Артемьевич; Mart'yanov, O. N.; Russian Science Foundation [17-12-01111]
}
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6.


    Kolovsky, A. R.
    Topological phase transitions in tilted optical lattices / A. R. Kolovsky // Phys. Rev. A. - 2018. - Vol. 98, Is. 1. - Ст. 013603, DOI 10.1103/PhysRevA.98.013603. - Cited References: 17 . - ISSN 2469-9926. - ISSN 2469-9934
РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
BLOCH OSCILLATIONS
   REALIZATION

   BANDS

   MODEL

Аннотация: We analyze the energy spectrum and eigenstates of cold atoms in a tilted brick-wall optical lattice. When the tilt is applied, the system exhibits a sequence of topological phase transitions reflected in an abrupt change of the eigenstates. It is demonstrated that these topological phase transitions can be easily detected in a laboratory experiment by observing Bloch oscillations of cold atoms.

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Держатели документа:
RAS, VL Kirensky Inst Phys SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Sch Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Коловский, Андрей Радиевич
}
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7.


    Val'kov, V. V.
    Effect of the three-center terms on the chiral superconducting d-wave pairing of the Hubbard fermions on the triangular lattice / V. V. Val'kov, T. A. Val'kova, V. A. Mitskan // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 129-132, DOI 10.1016/j.jmmm.2016.12.085. - Cited References: 14. - The reported study was funded by the Russian Foundation for Basic Research, project no. 16-02-00073 and by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project no. 16-42-240435. . - ISSN 0304-8853
РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
MODEL
Кл.слова (ненормированные):
Superconductivity -- Chiral order parametr -- Triangular lattice
Аннотация: Using the diagram technique for the Hubbard operators an integral equation that determines the order parameter of the superconducting phase Δ(p) was obtained in the framework of t−J−V and t−J*−V models on triangular lattice. It is shown that there are two scenarios of formation of superconducting phase with gapless spectrum at the critical concentration of carriers xc. The effect of three-center terms on implementation of this phase was also considered.

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Доп.точки доступа:
Val'kova, T. A.; Mitskan, V. A.; Мицкан, Виталий Александрович; Вальков, Валерий Владимирович; 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
}
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8.


    Kagan, M. Yu..
    Coulomb interactions-induced perfect spin-filtering effect in a quadruple quantum-dot cell / M. Y. Kagan, V. V. Val'kov, S. V. Aksenov // 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. 15-18, DOI 10.1016/j.jmmm.2016.12.106. - Cited References:29. - We acknowledge fruitful discussions with P.I. Arseyev, N.S. Maslova, V.N. Mantsevich and R.Sh. Ikhsanov. This work was supported by the Comprehensive programme SB RAS no. 0358-2015-0007, the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects nos. 15-02-03082, 16-42-243056, 16-42-242036, 17-42-240441. M.Yu.K. thanks the Program of Basic Research of the National Research University Higher School of Economics for support. . - ISSN 0304-8853. - ISSN 1873-4766
РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPINTRONICS
   TRANSPORT

   MODEL

Кл.слова (ненормированные):
Spin filter -- Quantum interference -- Fano-Feshbach resonance -- Coulomb -- correlations
Аннотация: A quadruple quantum-dot (QQD) cell is proposed as a spin filter. The transport properties of the QQD cell were studied in linear response regime on the basis of the equations of motion for retarded Green's functions. The developed approach allowed us to take into account the influence of both intra-and interdot Coulomb interactions on charge carriers' spin polarization. It was shown that the presence of the insulating bands in the conductance due to the Coulomb correlations results in the emergence of spin-polarized windows (SPWs) in magnetic field leading to the high spin polarization. We demonstrated that the SPWs can be effectively manipulated by gate fields and considering the hopping between central dots in both isotropic and anisotropic regimes.

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Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Aksenov, S. V.; Аксенов, Сергей Владимирович; 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
}
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9.


    Val'kov, V. V.
    The modification of low-temperature magnetic properties of the Fe-based double-zigzag single-chain magnet under irradiation / V. V. Val'kov, M. S. Shustin // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 19-22, DOI 10.1016/j.jmmm.2016.12.100. - Cited References: 14. - This study was supported by the Presidium of the Russian Academy of Sciences, program Actual problems of low temperature physics (project 0358-2015-0005); the Russian Foundation for Basic Research, projects nos. 16-42-243057 (partly with Government of Krasnoyarsk Territory) and 15-42-04372; Technology Support Fund to the research project nos. 14/16. The work of M.S.S. was supported by grant of the President of the Russian Federation (project MK-1398.2017.2). . - ISSN 0304-8853
   Перевод заглавия: Модификация низкотемпературных свойств железо содержащего одноцепочечного магнетика с магнитной топологией двойного зигзага
РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPIN-CROSSOVER
   MODEL

Кл.слова (ненормированные):
Single-chain magnets -- Light-induced spin crossover -- Magnetic susceptibility -- Quantum phase transitions
Аннотация: An exact solution for a generalized Ising model describing single-chain magnet {[FeIII(Tp*)(CN)3]2FeII(bpmh)}·2H2O with alternating high-spin and low-spin iron ions and double-zigzag magnetic topology has been calculated making use of the transfer-matrix technique. The introduction of a statistical ensemble taking into account the presence of iron ions with high-spin (HS) and low-spin (LS) states made it possible to describe the modification of magnetic susceptibility under optical irradiation. It has been shown that joint implementation of iron ions with photoinduced magnetic states and non-magnetic intersite repulsion ions of these states is caused by the difference of the ionic radii of HSFeIIHSFeII and LSFeIILSFeII leads to the quantum phase transitions in the system.

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Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; 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
}
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10.


    Kolovsky, A. R.
    Bose-Hubbard Hamiltonian: Quantum chaos approach / A. R. Kolovsky // Int. J. Mod. Phys. B. - 2016. - Vol. 30, Is. 10. - Ст. 1630009, DOI 10.1142/S0217979216300097. - Cited References:42 . - ISSN 0217-9792. - ISSN 1793-6578
   Перевод заглавия: Гамильтониан Бозе-Хаббарда: подход с точки зрения квантового хаоса
РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
Optical lattice
   Dynamics

   Atoms

   States

   Model

Кл.слова (ненормированные):
Cold atoms in optical lattices -- quantum transport -- nonlinear dynamics and chaos
Аннотация: We discuss applications of the theory of quantum chaos to one of the paradigm models of many-body quantum physics - the Bose-Hubbard (BH) model, which describes, in particular, interacting ultracold Bose atoms in an optical lattice. After preliminary, pure quantum analysis of the system we introduce the classical counterpart of the BH model and the governing semiclassical equations of motion. We analyze these equations for the problem of Bloch oscillations (BOs) of cold atoms where a number of experimental results are available. The paper is written for nonexperts and can be viewed as an introduction to the field.

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Доп.точки доступа:
Коловский, Андрей Радиевич
}
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