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    Dudarev, A. V.
    Lang-Firsov transformation in the generalized tight-binding method / A. V. Dudarev, E. I. Shneyder // J. Sib. Fed. Univ. Math. Phys. - 2023. - Vol. 16, Is. 6. - P780-785 ; Журн. СФУ. Матем. и физ. - Cited References: 9 . - ISSN 1997-1397. - ISSN 2313-6022
   Перевод заглавия: Преобразование Ланга-Фирсова в обобщенном методе сильной связи
Кл.слова (ненормированные):
Lang–Firsov transformation -- polaron and bipolaron crossover -- pd-model -- преобразование Ланга и Фирсова -- кроссовер поляронов и биполяронов -- pd-модель
Аннотация: The effects of strong electron-phonon interaction in a realistic model of a system with strong Coulomb correlations are analyzed using the Lang and Firsov transformation. It is shown that polaronic and bipolaronic transformations, widely discussed in the literature and associated with a smooth or sharp transitions in the properties of charge carriers when the strength of the electron-phonon coupling changes, determine the switching of the system between the regimes of correlated carriers, polarons or bipolarons. These transitions are controlled by the local electron-phonon interaction of the Holstein type. At the same time, the non local electron-lattice contribution associated with the modulation of the hopping integral plays a major role in the crossover of the polaron and bipolaron regimes in the limit of strong electron correlations.
В настоящей работе с помощью преобразования Ланга и Фирсова анализируются эффекты сильного электрон-фононного взаимодействия в реалистичной модели системы с сильными кулоновскими корреляциями. Показано, что широко обсуждаемые в литературе поляронные и биполяронные трансформации, связанные с плавным или резким изменением свойств носителей заряда при изменении силы электрон-фононной связи, определяют переключение системы между режимами коррелированных носителей, поляронов или биполяронов. При этом существенную роль в кроссовере поляронного и биполяронного режимов в пределе сильных электронных корреляций играет нелокальный электрон-фононный вклад, связанный с модуляцией интеграла перескока между различными орбиталями.

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Держатели документа:
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна

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Spin-polaron concept in the theory of normal and superconducting states of cuprates / V. V. Val'kov, D. M. Dzebisashvili, M. M. Korovushkin, A. F. Barabanov // Phys. Usp. - 2021. - Vol. 64, Is. 7. - P. 641-670, DOI 10.3367/UFNe.2020.08.038829. - Cited References: 328. - The authors' study was supported by the Russian Foundation for Basic Research (RFBR) within project nos. 18-02-00837, 19-02-00509, and 20-32-70059, and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund within project no. 18-42-240014 "Single-orbital effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors.'' The review was carried out with support from the RFBR within the Expansion competition (project no. 19-12-50116) . - ISSN 1063-7869. - ISSN 1468-4780

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
CHARGE-DENSITY-WAVE
HIGH-TEMPERATURE SUPERCONDUCTORS
Кл.слова (ненормированные):
strongly correlated electron systems -- high-temperature superconductivity -- spin polarons -- intersite Coulomb interaction -- London penetration depth
Аннотация: The review discusses the emergence of the spinfermion model of cuprates and the formation of the spin-polaron concept of the electronic structure of hole-doped cuprate superconductors. This concept has allowed describing the properties of cuprates in the normal phase as well as the features of superconducting pairing in the unified approach. The derivation of the spin-fermion model from the Emery model in the regime of strong electronic correlations is described, demonstrating the appearance of strong coupling between the spins of copper ions and holes on oxygen ions. Such a strong interaction against the background of the singlet state of the spin subsystem of copper ions (quantum spin liquid) leads to the formation of special Fermi quasiparticlesDnonlocal spin polarons. Under doping, the spin-polaron ensemble exhibits instability with respect to superconducting d-wave pairing, whereas superconducting swave pairing is not implemented. At the optimal doping, the transition to the superconducting phase occurs at temperatures corresponding to experimental data. It is shown that the superconducting d-wave pairing of spin-polaron quasiparticles is not suppressed by the Coulomb repulsion of holes located on neighboring oxygen ions. It is emphasized that, when the spectral characteristics of spin-polaron quasiparticles are taken into account, the calculated temperature and doping dependences of the London penetration depth are in good agreement with experimental data.

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Публикация на русском языке Спин-поляронная концепция в теории нормального и сверхпроводящего состояний купратов [Текст] / В. В. Вальков, Д. М. Дзебисашвили, М. М. Коровушкин, А. Ф. Барабанов // Успехи физ. наук. - 2021. - Т. 191 № 7. - С. 673-704

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys,Fed Res Ctr, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Prosp Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660037, Russia.
Russian Acad Sci, Vereshchagin Inst High Pressure Phys, Kaluzhskoe Shosse 14, Moscow 108840, Russia.

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [18-02-00837, 19-02-00509, 20-32-70059]; Government of Krasnoyarsk Region; Krasnoyarsk Region Science and Technology Support Fund [18-42-240014]; RFBRRussian Foundation for Basic Research (RFBR) [19-12-50116]
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Mitskan, V. A.
Implementation of the concept of spin polaron in cuprate superconductors within the diagram technique / V. A. Mitskan, M. M. Korovushkin, D. M. Dzebisashvili // JETP Letters. - 2021. - Vol. 114, Is. 5. - P. 289-295, DOI 10.1134/S0021364021170094. - Cited References: 43. - This work was supported by the Russian Foundation for Basic Research, project nos. 18-02-00837 and 20-32-70059 . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRONIC-STRUCTURE
ELEMENTARY EXCITATIONS
QUASI-PARTICLES
Аннотация: The spectral properties of an ensemble of spin-polaron quasiparticles have been studied within the spin–fermion model of cuprate superconductors using the method combining the Feynman diagram technique and the diagram technique for spin operators. It has been shown that strong spin–charge coupling results in the formation of the lower spin-polaron band separated by a wide energy gap from the band of bare holes. It has been shown that the spin-polaron band has a local minimum near the (π/2, π/2) point of the Brillouin zone. A class of diagrams for the self-energy part that have a fundamental significance for the description of the main features of the spin-polaron spectrum has been determined.

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Публикация на русском языке Мицкан, Виталий Александрович. Реализация концепции спинового полярона в купратных сверхпроводниках на основе диаграммной техники [Текст] / В. А. Мицкан, М. М. Коровушкин, Д. М. Дзебисашвили // Письма в ЖЭТФ. - 2021. - Т. 114 Вып. 5. - С. 339-345

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

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Мицкан, Виталий Александрович
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    Polaron transformations in the realistic model of the strongly correlated electron system / E. I. Shneyder, S. V. Nikolaev, M. V. Zotova [et al.] // Phys. Rev. B. - 2020. - Vol. 101, Is. 23. - Ст. 235114, DOI 10.1103/PhysRevB.101.235114. - Cited References: 69. - We acknowledge the stimulating discussions with V. A. Gavrichkov, G. Seibold, and K. I. Kugel. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project "Features of electron-phonon coupling in high-temperature superconductors with strong electronic correlations" No. 18-42-240017 and project "Electronic correlation effects and multiorbital physics in iron-based materials and cuprates" No. 19-42240007. . - ISSN 2469-9950. - ISSN 2469-9969
   Перевод заглавия: Поляронные трансформации в реалистичной модели системы с сильными электронными корреляциями

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
ANOMALOUS-DISPERSION
   PHONON INTERACTION
   PHASE-TRANSITIONS
   LO PHONONS
Аннотация: Electron-phonon coupling, diagonal in a real space formulation, leads to a polaron paradigm of smoothly varying properties. However, fundamental changes, namely the singular behavior of polarons, occur if off-diagonal pairing is involved into consideration. The study of polaron transformations and related properties of matter is of particular interest for realistic models, since competition between diagonal and off-diagonal electron-phonon contributions in the presence of other strong interactions can result in unconventional behavior of the system. Here we consider a two-dimensional multiband pd model of cuprate superconductors with electron-phonon interaction and analyze the features of the systems that are caused by the competition of diagonal and off-diagonal electron-phonon contributions in the limit of strong electron correlations. Using the polaronic version of the generalized tight-binding method, we describe the evolution of the band structure, Fermi surface, density of states at Fermi level, and phonon spectral function in the space of electron-phonon parameters ranging from weak to strong coupling strength of the adiabatic limit. On the phase diagram of polaron properties we reveal two quantum phase transitions and show how electron-phonon interaction gives rise to Fermi surface transformation (i) from hole pockets to true Fermi arcs and (ii) from hole to electron type of conductivity. We also demonstrate the emergence of new states in the phonon spectral function of the polaron and discuss their origin.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Nikolaev, S. V.; Николаев, Сергей Викторович; Zotova, M. V.; Зотова, Мария Владимировна; Kaldin, R. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [18-42-240017, 19-42240007]
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Val'kov, V. V.
Influence of the Coulomb repulsions on the formation of the superconducting gap of the spin-polaron quasiparticles in cuprates / V. V. Val'kov, M. M. Korovushkin, A. F. Barabanov // J. Low Temp. Phys. - 2019. - Vol. 196, Is. 1-2. - P. 242–252, DOI 10.1007/s10909-018-02120-3. - Cited References: 26. - The work was supported by the program of the Presidium of the Russian Academy of Sciences No. 12 “Fundamental problems of high-temperature superconductivity,” the Russian Foundation for Basic Research (Projects Nos. 16-02-00304 and 18-02-00837) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (Projects Nos. 18-42-243002 “Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors” and 18-42-243018 “Contact phenomena and magnetic disorder in the problem of the formation and detection of topological edge states in semiconductor nanostructures”), and the grant of the President of the Russian Federation (Project MK-1398.2017.2). . - ISSN 0022-2291. - ISSN 1573-7357
Кл.слова (ненормированные):
Cuprate superconductors -- Intersite Coulomb interaction -- Spin polarons -- Spin-charge correlations -- Unconventional superconductivity
Аннотация: Taking into account the real crystalline structure of the CuO2 plane and the strong spin-fermion coupling, the influence of the on-site Coulomb repulsion of holes Up and the intersite Coulomb repulsion V2 between holes located at the next-nearest-neighbor oxygen ions on the formation of the superconducting gap with the d-wave symmetry of the order parameter of the spin-polaron quasiparticles is studied. It is shown that the formation of the resulting superconducting gap within the spin-fermion model is caused by three components. The dependence of the narrowing of the superconducting gap on the values Up and V2 is analyzed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Vereshchagin Institute for High Pressure Physics, Troitsk, Moscow, Russia

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
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Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge / A. S. Sukhanov [et al.] // Phys. Rev. B. - 2019. - Vol. 99, Is. 21. - Ст. 214445, DOI 10.1103/PhysRevB.99.214445. - Cited References: 53. - We thank S. E. Nikitin for many stimulating discussions. A.S.S. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). Work at the TU Dresden was funded by the German Research Foundation (DFG) through projects B05 and C03 of the Collaborative Research Center SFB 1143 (project i.d. 247310070), Wurzburg-Dresden Cluster of Excellence ct.qmat (EXC 2147; project i.d. 39085490), and Priority Program SPP 2137 "Skyrmionics." . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics,
Рубрики:
TRIANGULAR SPIN CONFIGURATION
WEAK FERROMAGNETISM
MN3SN
Аннотация: We present detailed inelastic neutron scattering measurements of the noncollinear antiferromagnet Mn3Ge. Time-of-flight and triple-axis spectroscopy experiments were conducted at the temperature of 6 K, well below the high magnetic ordering temperature of 370 K. The magnetic excitations have a 5-meV gap and display an anisotropic dispersive mode reaching ~ 90 meV at the boundaries of the magnetic Brillouin zone. The spectrum at the zone center shows two additional excitations that demonstrate characteristics of both magnons and phonons. Ab initio lattice-dynamics calculations show that these can be associated with the magnon-polaron modes resulting from the hybridization of the spin fluctuations and the low-energy optical phonons. The observed magnetoelastic coupling agrees with the previously found negative thermal expansion in this compound and resembles the features reported in the spectroscopic studies of other antiferromagnets with similar noncollinear spin structures.

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Держатели документа:
Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany.
Tech Univ Dresden, Inst Festkorper & Mat Phys, D-01069 Dresden, Germany.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Univ Paris Saclay, CEA Saclay, CNRS, Lab Leon Brillouin,CEA, F-91191 Gif Sur Yvette, France.
Rutherford Appleton Lab, STFC, ISIS Facil, Didcot OX11 0QX, Oxon, England.

Доп.точки доступа:
Sukhanov, A. S.; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Bourges, P.h.; Walker, H. C.; Manna, K.; Felser, C.; Inosov, D. S.; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM); German Research Foundation (DFG) through project B05 of the Collaborative Research Center [SFB 1143, 247310070]; German Research Foundation (DFG) through project C03 of the Collaborative Research Center [SFB 1143, 247310070]; German Research Foundation (DFG) through Wurzburg-Dresden Cluster of Excellence ct.qmat [EXC 2147, 39085490]; German Research Foundation (DFG) [SPP 2137]
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Diagram Approach to the Problem of the Normal Phase Properties of the Spin-Polaron Ensemble in Cuprate Superconductors / V. V. Val'kov [et al.] // J. Low Temp. Phys. - 2019. - Vol. 197, Is. 1-2. - P. 34-43, DOI 10.1007/s10909-019-02211-9. - Cited References: 29. - The work was supported by the program of the Presidium of the Russian Academy of Sciences No. 12 “Fundamental problems of high-temperature superconductivity,” the Russian Foundation for Basic Research (RFBR) (Projects Nos. 18-02-00837 and 19-02-00509) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (Projects Nos. 18-42-243002 “Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors,” 18-42-243018 “Contact phenomena and magnetic disorder in the problem of the formation and detection of topological edge states in semiconductor nanostructures,” and 18-42-240014 “Single-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors”). . - ISSN 0022-2291
Кл.слова (ненормированные):
Cuprate superconductors -- Unconventional superconductivity -- Spin-charge correlations
Аннотация: Taking into account the real crystalline structure of the CuO 2 plane within the spin-fermion model and using the diagram technique, the spin-polaron concept of the fermionic excitations in cuprate superconductors is implemented. It is shown that an account of the on-site scattering processes leads to considerable binding energy of the spin-polaron quasiparticles. An account of the two-site spin-fermion scattering processes results in the energy spectrum and spectral properties of the spin-polaron quasiparticles which agree well with experimental data on cuprate superconductors.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
Vereshchagin Institute for High Pressure Physics, Troitsk, Moscow, 108840, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.
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The alternating-sign magnetoresistance of polycrystalline manganese chalcogenide films / S. S. Aplesnin [et al.] // Semicond. Sci. Technol. - 2018. - Vol. 33, Is. 8. - Ст. 085006, DOI 10.1088/1361-6641/aace44. - Cited References: 33. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the research project No 18-52-00009 Bel_a; No 18-32-00079 mol_a; No 18-42-240001 r_a; the state order No 3.5743.2017/6.7. . - ISSN 0268-1242. - ISSN 1361-6641

РУБ Engineering, Electrical & Electronic + Materials Science,
Рубрики:
NEUTRON-SCATTERING
   SURFACE-STATES
   MNTE
   CONDUCTIVITY
   MECHANISM
Кл.слова (ненормированные):
polycrystalline films -- magnetoresistance -- impedance -- polaron -- magnetic -- properties -- thermoelectric
Аннотация: The correlation between the dc and ac electrical resistance and the structural, magnetic, and thermoelectric properties of polycrystalline MnSe1−X Te Х (0.3 ≤ X ≤ 0.4) manganese chalcogenide films in the temperature range of 80–400 K has been investigated. Inhomogeneous electronic states and transitions between them accompanied by structural lattice deformations have been found at temperatures including the Neel temperature region. The magnetic susceptibility maximum above the Neel temperature in a magnetic field of 8.6 kOe has been observed. Temperature ranges of the coexistence of two types of electrically inhomogeneous states have been established by impedance spectroscopy in the frequency range of 0.1–1000 kHz and the change of the hopping conductivity for diffusion one accompanied by the magnetic susceptibility minimum has been found. The magnetoresistance in magnetic fields of up to 12 kОе has been established. It has been revealed that the thermopower and magnetoresistance change its sign upon heating. The experimental data are explained using a spin polaron model with the localization of polarons and formation of the electron phase-separation. The alternation of magnetoresistance in sign is attributed to the ferromagnetic orbital ordering of electrons and the negative magnetoresistance is explained by suppression of spin fluctuations in a magnetic field.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarskii Rabochi Ave 31, Krasnoyarsk 660014, Russia.
Sci Pract Mat Res Ctr NAS Belarus, P Brovki Str 19, Minsk 220072, BELARUS.

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Romanova, O. B.; Романова, Оксана Борисовна; Sitnikov, M. N.; Kretinin, V. V.; Galyas, A., I; Yanushkevich, K., I; Russian Foundation for Basic Research (RFBR) [18-52-00009 Bel_a, 18-32-00079 mol_a, 18-42-240001 r_a]; [3.5743.2017/6.7]
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Valkov, V. V.
Generalized Kondo lattice model and its spin-polaron realization by the projection method for cuprates / V. V. Valkov, D. M. Dzebisashvili, A. F. Barabanov // Theor. Math. Phys. - 2017. - Vol. 191, Is. 2. - P. 752-763, DOI 10.1134/S0040577917050142. - Cited References:35. - This research was supported by the Russian Foundation for Basic Research (Grant No. 16-02-00073, 16-02-00304, and 16-42-240435) and the Siberian Branch of the Russian Academy of Sciences (Complex Program No. II.2P, Grant No. 0358-2015-0005). . - ISSN 0040-5779. - ISSN 1573-9333

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
COPPER OXIDES
Кл.слова (ненормированные):
strong electron correlation -- spin-fermion model -- Kondo lattice model -- spin polaron
Аннотация: The spin-fermion model, which is an effective low-energy realization of the three-band Emery model after passing to the Wannier representation for the px and py orbitals of the subsystem of oxygen ions, reduces to the generalized Kondo lattice model. A specific feature of this model is the existence of spin-correlated hoppings of the current carriers between distant cells. Numerical calculations of the spectrum of spin-electron excitations highlight the important role of the long-range spin-correlated hoppings.

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Публикация на русском языке

Держатели документа:
RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk, Russia.
Reshetnyov Siberian State Aerosp Univ, Krasnoyarsk, Russia.
RAS, Inst High Pressure Phys, Troitsk, Moscow Oblast, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [16-02-00073, 16-02-00304, 16-42-240435]; Siberian Branch of the Russian Academy of Sciences (Complex Program) [II.2P, 0358-2015-0005]
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10.

Ovchinnikov, S. G.
Multiphonon contribution to the polaron formation in cuprates with strong electron correlations and strong electron-phonon interaction / S. G. Ovchinnikov, I. A. Makarov, P. A. Kozlov // Proceedings of SPIE - The International Society for Optical Engineering : SPIE, 2017. - Vol. 10105, DOI 10.1117/12.2266799. - Cited References: 17. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support.
Кл.слова (ненормированные):
High-temperature superconductivity -- Cuprates -- Strong electronic correlations -- Cluster form of perturbation theory -- Hubbard operator -- Three-band p-d model -- Electron-phonon interaction -- Polaron -- Franck-Condon broadening
Аннотация: In this work dependences of the electron band structure and spectral function in the HTSC cuprates on magnitude of electron-phonon interaction (EPI) and temperature are investigated. We use three-band p-d model with diagonal and offdiagonal EPI with breathing and buckling phonon mode in the frameworks of polaronic version of the generalized tight binding (GTB) method. The polaronic quasiparticle excitation in the system with EPI within this approach is formed by a hybridization of the local multiphonon Franck-Condon excitations with lower and upper Hubbard bands. Increasing EPI leads to transfer of spectral weight to high-energy multiphonon excitations and broadening of the spectral function. Temperature effects are taken into account by occupation numbers of local excited polaronic states and variations in the magnitude of spin-spin correlation functions. Increasing the temperature results in band structure reconstruction, spectral weight redistribution, broadening of the spectral function peak at the top of the valence band and the decreasing of the peak intensity. The effect of EPI with two phonon modes on the polaron spectral function is discussed. © 2017 SPIE.

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Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Kozlov, P. A.; Козлов, Пётр Александрович; Овчинников, Сергей Геннадьевич; Oxide-Based Materials and Devices(8 ; 2017 ; 29 Jan. - 1 Feb.)
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