Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Alexei Sherman"'
Autor:
Andreas Bill, Vladimir Hizhnyakov, Reinhard K. Kremer, Götz Seibold, Aleksander Shelkan, Alexei Sherman
Publikováno v:
Condensed Matter, Vol 5, Iss 4, p 65 (2020)
The microscopic mechanism of charge instabilities and the formation of inhomogeneous states in systems with strong electron correlations is investigated. We demonstrate that within a strong coupling expansion the single-band Hubbard model shows an in
Externí odkaz:
https://doaj.org/article/95b4fbdb912545b3849d44328f9719b4
Autor:
Alexei Sherman
To explain the low frequencies of quantum oscillations observed in lightly doped cuprates, we consider the two-dimension Hubbard model supplemented with the perpendicular magnetic field. For large Hubbard repulsions, the electron spectrum is investig
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a73e798321c703d6b153bbefbf64d89e
Autor:
Alexei Sherman
A new method for estimating the parameter ensuring the fulfillment of the Mermin-Wagner theorem in the strong coupling diagram technique (SCDT) for the two-dimensional Hubbard model is suggested. With the precise parameter value, calculated magnetic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bdfef9bacf55ba8ff5ec04b42f034546
http://arxiv.org/abs/2107.06520
http://arxiv.org/abs/2107.06520
Autor:
Alexei Sherman
Publikováno v:
The European Physical Journal B. 93
A model of CuO$_2$ planes of cuprate perovskites, containing $d_{x^2-y^2}$ copper orbitals and symmetric combinations of oxygen $p_\sigma$ orbitals, is investigated using the strong coupling diagram technique. This approach allows one to take into ac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3657a0567428b17ab437bcdeb5b61b16
https://doi.org/10.1140/epjb/e2020-10221-4
https://doi.org/10.1140/epjb/e2020-10221-4
Autor:
Alexei Sherman
The two-orbital Hubbard-Kanamori model is studied using the strong coupling diagram technique. This approach allows one to take into account the interactions of electrons with spin, charge, and orbital fluctuations of all ranges. It was found that, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9dae0d2eab38ecbc12b552228fd62750
http://arxiv.org/abs/2005.09901
http://arxiv.org/abs/2005.09901
Autor:
Aleksander Shelkan, Andreas Bill, Vladimir Hizhnyakov, Reinhard K. Kremer, Götz Seibold, Alexei Sherman
Publikováno v:
Condensed Matter
Volume 5
Issue 4
Condensed Matter, Vol 5, Iss 65, p 65 (2020)
Volume 5
Issue 4
Condensed Matter, Vol 5, Iss 65, p 65 (2020)
We investigate the microscopic mechanism of charge instabilities and the formation of inhomogeneous states in systems with strong electron correlations. It is demonstrated that within a strong coupling expansion the single-band Hubbard model shows an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f328ba696a302812d865d2ef0ac159e9
Autor:
Alexei Sherman
We relate the phase separation observed in many crystals with pronounced electron correlations to the regions of negative electron compressibility. They were found in several models describing strong electron correlations. At low temperatures, these
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7a1565aba6d0c7af05a75cae0034fce
Autor:
Alexei Sherman
Using the strong coupling diagram technique, we study the one-band repulsive Hubbard model on a two-dimensional square lattice in a wide range of chemical potentials $��$. Infinite sequences of diagrams describing interactions of electrons with s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::531b66172fc15c183be30d1daedd38f9
http://arxiv.org/abs/1905.02929
http://arxiv.org/abs/1905.02929
Autor:
Alexei Sherman
Publikováno v:
The European Physical Journal B. 92
Using the strong coupling diagram technique, magnetic and spectral properties of the two-dimensional repulsive Hubbard model are investigated in the ranges of repulsions $t\leq U\leq 10t$, temperatures $0.1t\lesssim T\lesssim 4t$ and electron concent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dc0d3c9741060e1cc86c0cfcb04254a5
https://doi.org/10.1140/epjb/e2019-90531-2
https://doi.org/10.1140/epjb/e2019-90531-2
Autor:
Alexei Sherman
Publikováno v:
Physica Scripta. 96:095804
The possibility of the superconducting transition in the repulsive Hubbard model on a square lattice is studied using the ladder approximation of the strong coupling diagram technique. The t–U and t–t′–t″–U models are considered in the re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed8b0c6f78af53a1a14e14b6ab86dd38
https://doi.org/10.1088/1402-4896/ac03e2
https://doi.org/10.1088/1402-4896/ac03e2