Персона: Неверов, Вячеслав Дмитриевич
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Неверов
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Вячеслав Дмитриевич
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- ПубликацияОткрытый доступAntiferromagnetic and spectral properties of two-orbital model of iron-based HTSC(2019) Neverov, V.; Lukyanov, A.; Zhumagulov, Y.; Krasavin, A.; Неверов, Вячеслав Дмитриевич; Лукьянов, Александр Евгеньевич; Красавин, Андрей Валерьевич© 2019 Published under licence by IOP Publishing Ltd. Two-orbital model describing iron-based high-temperature superconductors was studied within the limits of variational cluster approximation. The electron density of states for each orbital, as well as momentum distribution, were calculated; the magnetic ordering was determined. The results obtained are in a good agreement with known experimental data.
- ПубликацияОткрытый доступVariational cluster approximation and exact diagonalization for calculation of Hubbard models(2019) Lukyanov, A.; Neverov, V.; Zhumagulov, Y.; Krasavin, A.; Лукьянов, Александр Евгеньевич; Неверов, Вячеслав Дмитриевич; Красавин, Андрей Валерьевич© 2019 Published under licence by IOP Publishing Ltd. The numerical method was developed that combines the variational cluster approximation and the exact diagonalization techniques to solve Hubbard models of various dimensionality, number of orbitals, and lattice geometry. The developed method was tested on the one-band Hubbard model; antiferromagnetic ordering and the superconducting phase were observed, in accordance with known results obtained by other techniques. The method may be successfully used for studying properties of high-temperature superconductors.
- ПубликацияОткрытый доступSymmetry of superconducting order parameter in minimal model of iron-based HTSC: Variational cluster approximation(2019) Zhumagulov, Y.; Lukyanov, A.; Neverov, V.; Krasavin, A.; Лукьянов, Александр Евгеньевич; Неверов, Вячеслав Дмитриевич; Красавин, Андрей Валерьевич© 2019 Published under licence by IOP Publishing Ltd. Two-orbital model describing iron-based high-temperature superconductors is studied within the limits of variational cluster approximation. It is found that in the undoped regime the stripe antiferromagnetic ordering is realized, while in doped regime antiferromagnetism and superconductivity coexist. In the superconducting state, two types of symmetry are found: extended inter-orbit s-wave and intra-orbit d-wave, in agreement with known experimental results.
- ПубликацияТолько метаданныеPolaronic signatures in pristine phosphorene(2021) Perebeinos, V.; Neverov, V. D.; Lukyanov, A. E.; Zhumagulov, Y. V.; Krasavin, A. V.; Неверов, Вячеслав Дмитриевич; Лукьянов, Александр Евгеньевич; Красавин, Андрей Валерьевич©2021 American Physical Society.We investigate polaronic effects in a monolayer black phosphorus (or phosphorene) due to the charge carrier-intrinsic phonons interaction. We employ a microscopic model to describe vibrational spectra and electron-phonon interactions within the tight-binding approach. Our adiabatic solution for polarons suggests the critical coupling constant of λc=3.0 for polaron self-trapping in this anisotropic material. We report nonadiabatic calculations for the band-gap renormalization and the effective mass enhancement as a function of temperature and a range of electron-phonon coupling strengths. Our results demonstrate a surprising large band-gap renormalization, even for the lower bound of the electron-phonon coupling strength reported in the literature. We find that optical phonons give the dominant contributions to the polaronic effect.
- ПубликацияОткрытый доступFully Microscopic Treatment of Magnetic Field Using Bogoliubov–De Gennes Approach(2024) Neverov, V. D.; Kalashnikov, A.; Lukyanov, A. E.; Krasavin, A. V.; Неверов, Вячеслав Дмитриевич; Калашников, Александр Викторович; Лукьянов, Александр Евгеньевич; Красавин, Андрей ВалерьевичThis work introduces an algorithm designed to solve the Bogoliubovў??de Gennes equations of superconductivity theory. What sets this algorithm apart is its remarkable ability to precisely and consistently consider the impact of an external magnetic field, all within the microscopic approach. The computation schemeў??s convergence is guaranteed by addressing the Biotў??Savart equation for the field where the vector potential appears on both of its sides. To showcase the capabilities of this approach, we provide several key examples: the Abrikosov lattice, vortex core states, and the vortex structure in the intermediate mixed state of a superconductor. This method promises to offer valuable insights into the microscopic physics of intertype superconductivity.
- ПубликацияОткрытый доступEstimation of electron-phonon coupling constant in Ba1-xKxBiO3(2020) Lukyanov, A. E.; Neverov, V. D.; Krasavin, A. V.; Menushenkov, A. P.; Лукьянов, Александр Евгеньевич; Неверов, Вячеслав Дмитриевич; Красавин, Андрей Валерьевич; Менушенков, Алексей Павлович© Published under licence by IOP Publishing Ltd.The Holstein model was used to determine the value of electron-phonon coupling in BaBiO3-based compounds in the framework of the dynamical mean-field theory calculations for various levels of doping with potassium. The results obtained characterize the electron-phonon interaction as strong. The phase diagram of the model was calculated with reference to experimental data.
- ПубликацияТолько метаданныеPhase Diagram of the Two-Orbital Model for Iron-Based HTSC: Variational Cluster Approximation(2019) Zumagulov, Y. V.; Kashurnikov, V. A.; Krasavin, A. V.; Lukyanov, A. E.; Neverov, V. D.; Кашурников, Владимир Анатольевич; Красавин, Андрей Валерьевич; Лукьянов, Александр Евгеньевич; Неверов, Вячеслав ДмитриевичThe phase diagram of the two-dimensional two-orbital Hubbard model, which is widely used to describe high-temperature iron-based superconductors, is calculated in the electron doping region using the method of the variational cluster approximation. It is found that the coexistence of the antiferromagnetic and superconducting phases is realized in a wide range of electron doping values. In the superconducting phase, the order parameter has s(+/-) symmetry.
- ПубликацияТолько метаданныеEffect of Optical Excitation on the Band Structure and X-Ray Absorption Spectra of BaBiO3-Based High-Temperature Superconductors: Ab Initio Calculation(2019) Zhumagulov, Y. V.; Krasavin, A. V.; Lukyanov, A. E.; Neverov, V. D.; Yaroslavtsev, A. A.; Menushenkov, A. P.; Красавин, Андрей Валерьевич; Лукьянов, Александр Евгеньевич; Неверов, Вячеслав Дмитриевич; Менушенков, Алексей Павлович© 2019, Pleiades Publishing, Inc.The band structure, densities of states, and O K-edge X-ray absorption spectra have been calculated by the density functional theory method for BaBiO3-based perovskite high-temperature superconductors at different potassium doping levels in the ground and optically excited states. It has been shown that this approach including local structural inhomogeneities caused by doping and optical irradiation allows the correct description of changes in the properties of the electron subsystem near the Fermi level. It has been shown that doping is accompanied by the appearance of hole carriers on the Bi6s−O2pσ*. hybridized orbital in agreement with the model of the electronic structure of bismuth-based high-temperature superconductors in terms of a spatially separated Fermi-Bose mixture. It has been found that the band structure for the excited state of the undoped compound is equivalent to the band structure of the tight binding model for a cubic lattice. The results are important for the preliminary analysis of time-resolved X-ray absorption spectra on an X-ray free electron laser at femtosecond optical excitation.
- ПубликацияОткрытый доступElectronic structure of BaBiO: QMC CT-INT algorithm(2019) Lukyanov, A.; Neverov, V.; Krasavin, A.; Zhumagulov, Y.; Лукьянов, Александр Евгеньевич; Неверов, Вячеслав Дмитриевич; Красавин, Андрей Валерьевич© Published under licence by IOP Publishing Ltd.The continuous time quantum Monte Carlo algorithm with interaction expansion is implemented for Hubbard-Holstein model. Algorithm is approbated on the Bethe lattice with exact diagonalization technique and then is applied to calculate the self-energy of the BaBiO3 compound.
- ПубликацияОткрытый доступElectronic properties and X-ray absorption spectra of Ba1-xKxBiO3(2019) Zhumagulov, Y.; Krasavin, A.; Lukyanov, A.; Neverov, V.; Yaroslavtsev, A. A.; Menushenkov, A. P.; Красавин, Андрей Валерьевич; Лукьянов, Александр Евгеньевич; Неверов, Вячеслав Дмитриевич; Менушенков, Алексей Павлович© Published under licence by IOP Publishing Ltd.The band structure, the density of states, and X-ray absorption spectra of the oxygen K-edge for perovskite high-temperature superconductors based on BaBiO3 are calculated by the density functional theory method for different levels of potassium doping in the ground and optically excited states. It is shown that changes in the properties of the electronic subsystem near the Fermi level can be correctly described by taking into account local structural inhomogeneities caused by doping and exposure to optical radiation. The appearance with doping of hole carriers on the hybridized Bi6s - O2p σ∗ orbital is demonstrated, which agrees with the model of the electronic structure of bismuthate high-temperature superconductors based on a spatially separated Fermi-Bose mixture.