Phase Diagram of the Two-dimensional t–t′ Falicov-Kimball Model |
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| Authors: | Jacek Wojtkiewicz |
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| Institution: | (1) Department for Mathematical Methods in Physics, Hoza 74, 00-682 Warsaw, Poland |
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| Abstract: | The ground-state phase diagram of the two-dimensional Falicov-Kimball model with nearest-neighbour and next-nearest-neighbour hoppings has been studied in the perturbative regime where hoppings are small compared with the on-site Coulomb interaction. The phase diagram at fourth-order exhibits a richer structure than the one of the ordinary Falicov-Kimball model.
PACS numbers: 71.10.Fd, 71.21.+a, 75.10.Hk, 75.30.Kz |
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| Keywords: | Tight-binding models Falicov-Kimball model Perturbation expansions Phase diagrams Pirogov-Sinai theory |
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