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Kagan, M. Y. Manifestation of the upper Hubbard band in the 2D Hubbard model at low electron density / M. Y. Kagan, V. V. Val'kov, P. . Woelfle> // Low Temp. Phys. - 2011. - Vol. 37, Is. 9-10. - P. 834-839 ; Физика низких температур, DOI 10.1063/1.3670026. - Cited References: 31. - This work was supported by RFBR Grants No. 11-0200798 and 11-02-00741.
. - ISSN 1063-777XРУБ Physics, Applied Рубрики: 2-DIMENSIONAL FERMI GAS LIQUID BEHAVIOR SPECTRAL FUNCTIONS TRANSITION METALS SUPERCONDUCTIVITY FERROMAGNETISM DIMENSIONS SCATTERING STATE Кл.слова (ненормированные): electron density -- electronic density of states -- Fermi liquid -- Green's function methods -- Hubbard model Аннотация: We consider the 2D Hubbard model in the strong-coupling case (U > > W) and at low electron density (nd(2) ≪1). We find an antibound state as a pole in the two-particle T-matrix. The contribution of this pole in the self-energy reproduces a two-pole structure in the dressed one-particle Green-function similar to the Hubbard-I approximation. We also discuss briefly the Engelbrecht-Randeria mode which corresponds to the pairing of two holes below the bottom of the band for U >> W and low electron density. Both poles produce nontrivial corrections to Landau Fermi-liquid picture already at low electron density but do not destroy it in 2D.
WOS, Scopus, Читать в сети ИФ Держатели документа: [Kagan, M. Yu.] PL Kapitza Inst Phys Problem, Moscow 119334, Russia [Val'kov, V. V.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia [Woelfle, P.] Karlsruhe Inst Technol, Inst Theoret Condensed Matter Phys, D-76131 Karlsruhe, Germany ИФ СО РАН P.L. Kapitza Institute for Physical Problem, 2 ul. Kosygina, Moscow 119334, Russian Federation Kirensky Institute of Physics, Akademgorodok, 50, bld. 38, Krasnoyarsk 660036, Russian Federation Institute for Theoretical Condensed Matter physics, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, Karlsruhe D-76131, Germany Доп.точки доступа: Val'kov, V. V.; Вальков, Валерий Владимирович; Woelfle, P. } Найти похожие
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