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Shneyder, E. I.
Phonon and magnetic pairing mechanisms in high-temperature superconductors in the strong correlation limit / E. I. Shneyder, S. G. Ovchinnikov // JETP Letters. - 2006. - Vol. 83, Is. 9. - P. 394-398, DOI 10.1134/S0021364006090062. - Cited References: 22 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
BAND HUBBARD-MODEL
   ELECTRON
   SCATTERING
   SPECTRUM
Аннотация: The t-t'-t"-J* model of electrons interacting with three phonon modes (breathing, apical breathing, and buckling) is considered. The wave-vector dependence of the matrix elements of the electron-phonon interaction leads to opposite contributions to the pairing potential with the d(x2-y2) symmetry: the buckling mode facilitates electron pairing, while the breathing mode suppresses it. As a result, the critical temperature of La2-xSrxCuO4 that is associated with the magnetic mechanism is lowered when phonons are taken into account.

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Шнейдер, Елена Игоревна
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Shneyder, E. I.
Contribution of the non-Heisenberg ring exchange to the magnetic mechanism of high-Tc superconductivity / E. I. Shneyder, S. G. Ovchinnikov, A. V. Shnurenko // JETP Letters. - 2012. - Vol. 95, Is. 4. - P. 193-197, DOI 10.1134/S0021364012040078. - Cited References: 44. - This work was supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh-1044.2012.2), by the Russian Foundation for Basic Research (project no. 12-02-00040), by the Presidium of the Russian Academy of Sciences (program no. 20 "Quantum Mesoscopic and Disordered Systems"), jointly by the Siberian and Ural Branches of the Russian Academy of Sciences, by Siberian Federal University (project no. s/b S-11), and by the Ministry of Education and Science of the Russian Federation (state contract no. P891, federal program "Human Capital"). E.I.Sh. acknowledges the support of the Dynasty Foundation. . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
BAND HUBBARD-MODEL
   COPPER OXIDES
   ELEMENTARY EXCITATIONS
   SPIN
   ELECTRON
   STATE
   T/U
Аннотация: The effect of non-Heisenberg four-spin ring exchange on the superconducting transition temperature in strongly correlated electron systems is studied. It is shown that the ring exchange can significantly suppress the contribution of the Heisenberg exchange to superconducting pairing.

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Публикация на русском языке Шнейдер, Елена Игоревна. Влияние негейзенберговского кольцевого обмена на магнитный механизм высокотемпературной сверхпроводимости [Текст] / Е. И. Шнейдер, С. Г. Овчинников, А. В. Шнуренко // Письма в Журн. эксперим. и теор. физ. : Санкт-Петербургская издательская фирма "Наука" РАН, 2012. - Т. 95 Вып. 3-4. - С. 211-215

Держатели документа:
[Shneyder, E. I.
Ovchinnikov, S. G.
Shnurenko, A. V.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shnurenko, A. V.; Шнуренко, А. В.; Шнейдер, Елена Игоревна
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Sadreev, A. F.
Bound states in the continuum in zigzag quantum wire enforced by a finger gate / A. F. Sadreev, A. S. Pilipchuk // JETP Letters. - 2015. - Vol. 100, Is. 9. - P. 585-590, DOI 10.1134/S0021364014210139. - Cited References:41. - This work was supported by the Russian Foundation for Basic Research(project no. 14-12-00266). . - ISSN 0021. - ISSN 1090-6487. -

РУБ Physics, Multidisciplinary
Рубрики:
WAVE-GUIDE
   DOUBLE-BEND
   SYSTEMS
   TRANSMISSION
   RESONANCES
   ELECTRON
Аннотация: We consider electron transport in a zigzag quantum wire by the effect of finger gate potential. Using a non-Hermitian effective Hamiltonian, we calculate resonance positions and widths to show that the resonance widths are easily governed by the gate potential. In particular, the resonance width can be enforced to be equal to zero, which leads to an electron localization with the Fermi energy embedded in the propagation band of the wire, i.e., the bound state in the continuum (BSC). We show that, for positive values of the potential, a zigzag wire becomes a Fabry-Perot resonator to give rise to BSC too.

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Публикация на русском языке Садреев, Алмаз Фаттахович. Связанные состояния в континууме, инициированные потенциалом электрода в зигзагообразной квантовой проволоке [Текст] / А. Ф. Садреев, А. C. Пилипчук // Письма в Журн. эксперим. и теор. физ. - 2014. - Т. 100 Вып. 9-10. - С. 664– 669

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660080, Russia.

Доп.точки доступа:
Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Садреев, Алмаз Фаттахович; Russian Foundation for Basic Research [14-12-00266]
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Sadreev, A. F.
Bound states in the continuum in open quantum billiards with a variable shape / A. F. Sadreev, E. N. Bulgakov, I. . Rotter // Phys. Rev. B. - 2006. - Vol. 73, Is. 23. - Ст. 235342, DOI 10.1103/PhysRevB.73.235342. - Cited References: 24 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
TRANSMISSION
   RESONANCES
   ELECTRON
   DYNAMICS
Аннотация: We show the existence of bound states in the continuum (BICs) in quantum billiards (QBs) that are opened by attaching single-channel leads to them. They may be observed by varying an external parameter continuously, e.g., the shape of the QB. At some values of the parameter, resonance states with vanishing decay width (the BICs) occur. They are localized almost completely in the interior of the closed system. The phenomenon is shown analytically to exist in the simplest case of a two level QB and is complemented by numerical calculations for a real QB.

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Держатели документа:
Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
ИФ СО РАН
Institute of Physics, Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Rotter, I.; Садреев, Алмаз Фаттахович
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Optodynamic phenomena in aggregates of polydisperse plasmonic nanoparticles / A. E. Ershov [et al.] // Appl. Phys. B. - 2014. - Vol. 115, Is. 4. - P. 547-560, DOI 10.1007/s00340-013-5636-6. - Cited References: 48. - Authors are thankful to Prof. V. A. Markel (University of Pennsylvania) for supplying program codes for realization of the coupled dipole method for polydisperse metal nanoparticle aggregates. This research was supported by the Russian Academy of Sciences under the Grants 24.29, 24.31, III.9.5, 43, SB RAS-SFU (101); Ministry of Education and Science of Russian Federation under Contract 14.B37.21.0457. . - ISSN 0946-2171. - ISSN 1432-0649

РУБ Optics + Physics, Applied
Рубрики:
SMALL-PARTICLE COMPOSITES
   OPTICAL-PROPERTIES
   NOBLE-METALS
   SILVER
   ELECTRON
   LIQUID
   GENERATION
   DYNAMICS
   FORCES
   GOLD
Аннотация: We propose an optodynamical model of interaction of pulsed laser radiation with aggregates of spherical metallic nanoparticles embedded into host media. The model takes into account polydispersity of particles, pair interactions between the particles, dissipation of absorbed energy, heating and melting of the metallic core of particles and of their polymer adsorption layers, and heat exchange between electron and ion components of the particle material as well as heat exchange with the interparticle medium. Temperature dependence of the electron relaxation constant of the particle material and the effect of this dependence on interaction of nanoparticles with laser radiation are first taken into consideration. We study in detail light-induced processes in the simplest resonant domains of multiparticle aggregates consisting of two particles of an arbitrary size in aqueous medium. Optical interparticle forces are realized due to the light-induced dipole interaction. The dipole moment of each particle is calculated by the coupled dipole method (with correction for the effect of higher multipoles). We determined the role of various interrelated factors leading to photomodification of resonant domains and found an essential difference in the photomodification mechanisms between polydisperse and monodisperse nanostructures.

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Держатели документа:
Russian Acad Sci, LV Kirenski Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660028, Russia

Доп.точки доступа:
Ershov, A. E.; Ершов, Александр Евгеньевич; Gavrilyuk, A. P.; Karpov, S. V.; Карпов, Сергей Васильевич; Semina, P. N.; Семина, Полина Николаевна; Russian Academy of Sciences [24.29, 24.31, III.9.5, 43, SB RAS-SFU (101)]; Ministry of Education and Science of Russian Federation [14.B37.21.0457]
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Makarov, I. A.
Reconstruction of the Fermi surface of HTSC cuprates in a high magnetic field / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneider // JETP Letters. - 2009. - Vol. 89, Is. 12. - P. 632-637, DOI 10.1134/S002136400912008X. - Cited References: 19. - This work was supported by the Russian Foundation for Basic Research (project no. 09-02-00127), the Siberian Branch and the Ural Division, Russian Academy of Sciences (integration project no. 40), and the Presidium of the Russian Academy of Sciences (program no. 5.7). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   COPPER OXIDES
   ELECTRON
   SPECTRUM
   BAND
Аннотация: The effect of a high magnetic field on the electronic structure of HTSC cuprates is considered. The study is performed in the t-t'-taEuro(3)-J* model, and the high magnetic field effect is taken into account not only as the Zeeman splitting of the one-electron levels, but also in the occupation numbers of the states with different spin projections and in the formation of the spin correlation functions. The field is assumed to be high enough to align all of the spins along the field. As a result, the Fermi surface reconstruction is obtained from four hole pockets about the nodal point (pi/2, pi/2) in the paramagnetic phase to a large hole pocket about the point (pi, pi) in the ferromagnetic phase. As the magnetic field strength decreases, a number of quantum phase transitions are revealed; they are manifested in the changed Fermi surface topology. The Fermi surface reconstruction with a decreasing field is qualitatively the same as that with an increasing doping degree in the absence of a magnetic field.

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Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.
Shneider, E. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneider, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneider, E. I.; Шнейдер, Елена Игоревна; Макаров, Илья Анатольевич; Russian Foundation for Basic Research [09-02-00127]; Siberian Branch and the Ural Division, Russian Academy of Sciences [40]; Presidium of the Russian Academy of Sciences [5.7]
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Makarov, I. A.
Effect of Interlayer Single-Particle Hoppings on the Superconducting Transition Temperature / I. A. Makarov, S. G. Ovchinnikov // JETP Letters. - 2011. - Vol. 93, Is. 6. - P. 339-343, DOI 10.1134/S0021364011060063. - Cited References: 27. - This work was supported by the Presidium of the Russian Academy of Sciences (program no. 18.7 "Quantum Physics of Condensed Matter"), by the Siberian and Ural Branches of the Russian Academy of Sciences (joint project no. 40), by the Russian Foundation for Basic Research (project no. 09-02-00127), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-1683.2010.2), and by the Ministry of Education and Science of the Russian Federation (project no. GK P891, federal program "Scientific and Pedagogical Personnel of Innovative Russia"). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   DEPENDENCE
   YBA2CU3O7-DELTA
   ELECTRON
   SPECTRUM
   STRESS
Аннотация: It is well known that the superconducting transition temperature of high-T-c cuprates depends on the number of CuO2 planes in the unit cell. The multilayer structure implies the possibility of interlayer hopping. Under the assumption that the interlayer hopping can be specified by the parameter t(perpendicular to)(k) = t(perpendicular to)(cos(k(x)) - cos(k(y)))(2), the quasiparticle excitation spectrum for the bilayer cuprate in the superconducting state has been determined in the framework of the t - t' - t '' - t(perpendicular to) - J* model using the generalized mean-field approximation. It turns out that the interlayer hoppings does not create any additional mechanism of the Cooper paring and does not lead to an increase in T-c. The splitting of the upper Hubbard quasiparticle band attributed to the interlayer hoppings is manifested as two peaks in the doping dependence of the superconducting transition temperature at temperatures below the maximum T-c value for a single-layer cuprate. It has been found that antiferromagnetic interlayer correlations suppress the interlayer splitting. This probably leads to the common doping dependence of T-c for both single-layer and bilayer cuprates.

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Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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Korshunov, M. M.
Effective hamiltonian and properties of the normal and superconducting phases of n-type cuprates / M. M. Korshunov, S. G. Ovchinnikov, A. V. Sherman // JETP Letters. - 2004. - Vol. 80, Is. 1. - P. 39-43, DOI 10.1134/1.1800212. - Cited References: 32 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   ORDER-PARAMETER
   QUASI-PARTICLES
   COPPER OXIDES
   FERMI-SURFACE
   ELECTRON
   SYMMETRY
   RANGE
   ND1.85CE0.15CUO4
   TRANSITIONS
Аннотация: An effective low-energy Hamiltonian is derived from a microscopic multiband p-d model in the regime of strong electron correlations. The parameters of the p-d model are determined by comparison with the ARPES data for undoped Nd2CuO4. The Hamiltonian is the t-J* model in which hopping and exchange slowly decay with distance and are taken into account up to the fifth coordination sphere. The quasiparticle band structure is calculated as a function of the doping concentration with regard to short-range magnetic order, and the superconductivity theory with the spin-fluctuation pairing mechanism is constructed. Assuming that the parameters of the model do not depend on the doping level, we obtained quantitative agreement with the properties observed experimentally for the normal and superconducting phases without introducing fitting parameters. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Institute of Physics, University of Tartu, Tartu, 51014, Estonia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Sherman, A. V.; Коршунов, Максим Михайлович
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    Ignatchenko, V. A.
    Fine structure of the crossing resonance spectrum of wavefields in an inhomogeneous medium / V. A. Ignatchenko, D. S. Polukhin // J. Exp. Theor. Phys. - 2020. - Vol. 130, Is. 3. - P. 358-369, DOI 10.1134/S1063776120010033. - Cited References: 37 . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
SUPERCONDUCTING CRITICAL-TEMPERATURE
   ELECTRON
   BREAKDOWN
   SPIN
Аннотация: The crossing resonance of two wavefields m(x, t) and u(x, t) of different natures in an inhomogeneous medium with zero mean value of the coupling parameter η between fields has been studied. The stages of formation of the fine structure of the crossing resonance have been analyzed. It has been shown within the model of independent crystallites that the removal of the degeneracy of eigenfrequencies of these fields at the crossing resonance point has a threshold character in the coupling parameter and occurs under the condition η ηc, where ηc = |Γu – Γm|/2, Γu and Γm are the relaxation parameters of the corresponding wavefields. At η ηc, each random implementation of the Green’s functions G~′′mm and G~′′uu of wavefields has the form of two resonance peaks with the same half-width (Γu + Γm)/2 spaced by the interval 2η; this form is standard for crossing resonances. At η ηc, the functions G~′′mm and G~′′uu are different: if Γu Γm, the function G~′′mm has the form of a narrow resonance peak at ω = ωr, whereas the function G~′′uu has the form of a broader resonance peak split at the top by a narrow antiresonance. Averaging over regions where η ηc leads to the formation of a broad resonance with a resonance line half-width of about η2〉1/2 on the both averaged Green’s functions, which is due to the stochastic distribution of resonance frequencies. Averaging over regions where η ηc results in the sharpening of a resonance peak on the function G′′mm and an antiresonance peak on the function G′′uu at the same frequency ω vu at the first and second crossing points, respectively.

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Публикация на русском языке Игнатченко, Вальтер Алексеевич. Тонкая структура спектра кроссинг-резонанса волновых полей в неоднородной среде [Текст] / В. А. Игнатченко, Д. С. Полухин // Журн. эксперим. и теор. физ. - 2020. - Т. 157 Вып. 3. - С. 428-441

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

Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Игнатченко, Вальтер Алексеевич
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10.

Ignatchenko, V. A.
Development of a self-consistent approximation / V. A. Ignatchenko, D. S. Polukhin // J. Phys. A. - 2016. - Vol. 49, Is. 9. - Ст. 095004, DOI 10.1088/1751-8113/49/9/095004. - Cited References: 43 . - ISSN 1751-8113

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
SUPERCONDUCTING CRITICAL-TEMPERATURE
   LATTICE-VIBRATIONS
   VERTEX FUNCTION
   ELECTRON
Кл.слова (ненормированные):
self-consistent approximation -- Green's functions -- vertex corrections -- inhomogeneities -- correlations -- dynamic susceptibility
Аннотация: A self-consistent approximation of a higher level than the standard self-consistent approximation, known in various fields of physics as the Migdal, Kraichnan or Born self-consistent approximation, is derived taking into account both the first and second terms of the series for the vertex function. In contrast to the standard approximation, the new self-consistent approximation is described by a system of two coupled nonlinear integral equations for the self-energy and the vertex function. In addition to all the diagrams with non-intersecting lines of correlation/interaction taken into account by the standard self-consistent approximation, the new approach takes into account in each term of the Green's function expansion a significant number of diagrams with intersections of these lines. Because of this, the shape, linewidth, and amplitude of the resonance peaks of the dynamic susceptibility calculated in this approximation are much closer to the exact values of these characteristics. The advantage of the new self-consistent approach is demonstrated by the example of calculation of the dynamic susceptibility of waves in an inhomogeneous medium. © 2016 IOP Publishing Ltd.

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Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Игнатченко, Вальтер Алексеевич
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