Abstract
Self-consistent equations corresponding to the single-loop approximation at an arbitrary relation between the Hubbard energy U and hop integral t have been obtained for the determination of the energy spectrum in the Hubbard model. The conditions of the insulator-metal transition, as well as the conditions for the transition from the paradielectric to antiferromagnetic state (spin-density wave), have been determined in the case of an exactly half-filled band.
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Original Russian Text © R.O. Zaitsev, 2015, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 101, No. 3, pp. 218–223.
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Zaitsev, R.O. Low-temperature properties of the Hubbard model. Jetp Lett. 101, 199–205 (2015). https://doi.org/10.1134/S0021364015030157
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DOI: https://doi.org/10.1134/S0021364015030157