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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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Теперь показываю 1 - 10 из 21

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The Impact of Short-Range (Gaussian) Disorder Correlations on Superconducting Characteristics
(2024) Neverov, V. D.; Lukyanov, A. E.; Krasavin, A. V.; Vagov, A.; Неверов, Вячеслав Дмитриевич; Лукьянов, Александр Евгеньевич; Красавин, Андрей Валерьевич
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Nonlinear spectroscopy of excitonic states in transition metal dichalcogenides
(2022) Zhumagulov, Y. V.; Gulevich, D. R.; Vagov, A.; Perebeinos, V.; Neverov, V. D.; Lukyanov, A. E.; Krasavin, A. V.; Неверов, Вячеслав Дмитриевич; Лукьянов, Александр Евгеньевич; Красавин, Андрей Валерьевич
© 2022 American Physical Society.Second-harmonic generation (SHG) is a well-known nonlinear spectroscopy method to probe electronic structure, specifically, in transition metal dichalcogenide (TMDC) monolayers. This work investigates the nonlinear dynamics of a strongly excited TMDC monolayer by solving the time evolution equations for the density matrix. It is shown that the presence of excitons qualitatively changes the nonlinear dynamics leading, in particular, to a huge enhancement of the nonlinear signal as a function of the dielectric environment. It is also shown that the SHG polarization angular diagram and its dependence on the driving strength are very sensitive to the type of exciton state. This sensitivity suggests that SHG spectroscopy is a convenient tool for analyzing the fine structure of excitonic states.
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Symmetry 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.
Только метаданные
Поляронные эффекты в фосфорене
(2020) Неверов, В. Д.; Неверов, Вячеслав Дмитриевич; Красавин Андрей Валерьевич
Только метаданные
Correlated disorder as a way towards robust superconductivity
(2022) Vagov, A.; Croitoru, M. D.; Neverov, V. D.; Lukyanov, A. E.; Krasavin, A. V.; Неверов, Вячеслав Дмитриевич; Лукьянов, Александр Евгеньевич; Красавин, Андрей Валерьевич
© 2022, The Author(s).Ordinary superconductors are widely assumed insensitive to small concentrations of random nonmagnetic impurities, whereas strong disorder suppresses superconductivity and even makes superconductor-insulator transition occur. In between these limiting cases, a most fascinating regime can take place where disorder enhances superconductivity. Hitherto, almost all theoretical studies have been conducted under the assumption that disorder is completely independent and random. In real materials, however, positions of impurities and defects tend to correlate with each other. This work shows that these correlations have a strong impact on superconductivity making it more robust and less sensitive to the disorder potential. Superconducting properties can therefore be controlled not only by the overall density of impurities and defects, but by their spatial correlations as well.
Открытый доступ
Exploring disorder correlations in superconducting systems: spectroscopic insights and matrix element effects
(2024) Neverov, V. D.; Lukyanov, A. E.; Krasavin, A. V.; Vagov, A.; Неверов, Вячеслав Дмитриевич; Лукьянов, Александр Евгеньевич; Красавин, Андрей Валерьевич
Открытый доступ
Antiferromagnetic 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.
Открытый доступ
Estimation 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.
Открытый доступ
Electronic 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.
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Laser-induced ultrafast insulator-metal transition in BaBiO3
(2020) Lukyanov, A. E.; Neverov, V. D.; Zhumagulov, Y. V.; Menushenkov, A. P.; Krasavin, A. V.; Лукьянов, Александр Евгеньевич; Неверов, Вячеслав Дмитриевич; Менушенков, Алексей Павлович; Красавин, Андрей Валерьевич
We investigate ultrafast coherent quantum dynamics of undoped BaBiO3 driven by a strong laser pulse. Our calculations demonstrate that in a wide range of radiation frequencies and intensities the system undergoes a transient change from the insulating to the metallic state, where the charge density wave and the corresponding energy spectrum gap vanish. The transition takes place on the ultrafast timescale of tens femtoseconds, comparable to the period of the corresponding lattice vibrations. The dynamics are determined by a complex interplay of the particle-hole excitation over the gap and of the tunneling through it, giving rise to the highly nontrivial time evolution which comprises high harmonics and reveals periodic reappearance of the gap. The time evolution is obtained by solving the dynamical mean-field theory equations with the realistic parameters for the system and radiation. Results are summarized in the phase diagram, helpful for a possible experimental setup to achieve a dynamical control over the conduction state of this and other materials with the similarly strong electron-phonon interaction.