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/ V. I. Kuz'min, S. V. Nikolaev, S. G. Ovchinnikov // Phys. Rev. B. - 2014. - Vol. 90, Is. 24. - Ст. 245104, DOI 10.1103/PhysRevB.90.245104. - Cited References: 37. - This work is supported by RFBR (Grants No. 13-02-01395-a, No. 14-02-31677-mol-a, and No. 14-02-00186-a), the Ministry of Education and Science of Russia (Government Contract No. 3085, SibFU 2014 GF-2), and a grant of the Russian President (Grant No. NSh-2886.2014.2). . - ISSN 1098-0121. - ISSN 1550-235XРУБ Physics, Condensed Matter

Аннотация: Electronic dispersion and density of states ( DOS) have been calculated for the Hubbard model and the t - J and t - J* models with three-site correlated hopping by the cluster perturbation theory. We have found a rather strong quantitative difference both in dispersion and DOS at all doping for the Hubbard and t - J models at the energy scale omega greater than or similar to t. The three-site correlated hopping addition results in an almost negligible difference for the Hubbard and t - J* models. Close to the Fermi energy, at the scale omega less than or similar to J, the electronic structure of all three models is similar. We have found the line of zeros of the Green function for the t J model that has been previously obtained for the Hubbard model by cellular dynamical mean-field theory calculations.

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Держатели документа:
[Kuz'min, V. I.
Nikolaev, S. V.
Ovchinnikov, S. G.] SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Nikolaev, S. V.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН

Доп.точки доступа:
Kuz'min, V.I.; Nikolaev, S.V.; Ovchinnikov, S.G.; RFBR [13-02-01395-a, 14-02-31677-mol-a, 14-02-00186-a]; Ministry of Education and Science of Russia [3085, SibFU 2014 GF-2]; [NSh-2886.2014.2]