Zobrazeno 1 - 8 of 8 pro vyhledávání: '"Vaclav Janis"'
1
Single-impurity Anderson model out of equilibrium: A two-particle semianalytic approach
Autor: Jiawei Yan, Vaclav Janis
Publikováno v: Physical Review B. 105
We apply a two-particle semi-analytic approach to a single Anderson impurity attached to two biased metallic leads. The theory is based on reduced parquet equations justified in critical regions of singularities in the Bethe-Salpeter equations. It of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dc7427a5dc902027d91e8c8105d90610
https://doi.org/10.1103/physrevb.105.085122
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2
Akademický článek
Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot
Autor: Václav Janiš, Jiawei Yan
Publikováno v: AIP Advances, Vol 12, Iss 3, Pp 035139-035139-6 (2022)
The zero-temperature physics of interacting quantum dots attached to superconducting leads is now well understood. The overall qualitative picture is obtained from the static mean-field approximation. The situation drastically changes at non-zero tem
Externí odkaz: https://doaj.org/article/328c6e6b826040f89f5651735dd3011f
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3
Dynamical electron correlations in metals: TB-LMTO and multiband Hubbard Hamiltonian
Autor: Drchal, V., Vaclav Janis, Kudrnovsky, J.
Publikováno v: ResearcherID
We study electronic properties of solids with correlated d electrons which could be described by a multiband Hubbard Hamiltonian in the weak-interaction case, $U/w
13 pages, 6 PS figures; International Workshop on Electron Correlations and Mater
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e9e8a773dfc48c54b47ad0b613f6dc9
http://arxiv.org/abs/cond-mat/9810181
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4
Strongly correlated electrons: Dynamical vertex renormalization
Autor: Vaclav Janis
Publikováno v: ResearcherID
Single-band Hubbard model at criticality of the metal-insulator transition is studied using approximations derived from parquet theory. It is argued that only the electron-hole and interaction two-particle channels in the parquet algebra are relevant
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cdc8d2cfd8ec60d90e7e05e09a398d1
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5
Green functions in the renormalized many-body perturbation theory for correlated and disordered electrons
Autor: Vaclav Janis
Publikováno v: Condensed Matter Physics, Vol 9, Iss 3, Pp 499-518 (2006)
ResearcherID
The ways of introducing and handling renormalizations in the many-body perturbation theory are reviewed. We stress the indispensable role the technique of Green functions plays in extrapolating the weak-coupling perturbative approaches to intermediat
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b10f31b4f1bd73403ec793eb96dc4455
https://doi.org/10.5488/cmp.9.3.499
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6
Akademický článek
Antiferromagnetic fluctuations in the one-dimensional Hubbard model
Autor: Václav Janiš, Antonín Klíč, Jiawei Yan
Publikováno v: AIP Advances, Vol 10, Iss 12, Pp 125127-125127-6 (2020)
We study the low-temperature critical behavior of the one-dimensional Hubbard model near half filling caused by enhanced antiferromagnetic fluctuations. We use a mean-field-type approximation with a two-particle self-consistency renormalizing the bar
Externí odkaz: https://doaj.org/article/4df86205c7c24898ade1500bec32d3a2
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