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Lundin, U.
Mott-Hubbard transition in the N-orbital Hubbard model / U. . Lundin, I. . Sandalov, B. . Johansson // Physica B. - 2000. - Vol. 281. - P. 836-837, DOI 10.1016/S0921-4526(99)00980-1. - Cited References: 5
. - ISSN 0921-4526РУБ Physics, Condensed Matter
Кл.слова (ненормированные):
Hubbard model -- Mott-Hubbard transition -- d(1) systems
Аннотация: The Mort-Hubbard insulator-metal transition (MHT) is studied for the N-orbital symmetrical Hubbard model with diagonal (t(1)) and non-diagonal(t(2)) hopping matrix elements. In the paramagnetic state (PM) For an n = 1 filling the non-diagonal hopping gives rise to two wide Hubbard sub-bands with small spectral weight of the order of similar to 1/N and 2N - 2 narrow sub-bands with a large weight similar to (1 - 1/N). No orbital polarization arises in this solution. In some directions in the (t(1), t(2))-plane the insulating energy gap in the density of stares is closed in the vicinity of a critical Hubbard repulsion of U-c similar to z(t(1) + (N - 1)t(2)) (z-coordination number), whereas the narrow bands in this region of parameters still correspond to a deeply correlated phase (with bandwidth z(t(1) - t(2))). (C) 2000 Elsevier Science B.V. All rights reserved.
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Держатели документа:
Univ Uppsala, Dept Phys, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
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Доп.точки доступа:
Sandalov, I.; Johansson, B.; Yamada Conference on Strongly Correlated Electon Systems(51 ; 1999 ; Aug. 24-28 ; NAGANO, JAPAN))
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