Novel Mott Transitions in Non-Isotropic Two-Band Hubbard Model

Details Novel Mott Transitions in Non-Isotropic Two-Band Hubbard Model Novel Mott Transitions in Non-Isotropic Two-Band Hubbard Model

2005-05-16

arxiv.org/abs/cond-mat/0505393v3

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures improved results for n_s=8

Scientific paper

10.1103/PhysRevLett.95.116402

The Mott transition in a two-band Hubbard model involving subbands of different widths is studied as a function of temperature using dynamical mean field theory combined with exact diagonalization. The phase diagram is shown to exhibit two successive first-order transitions if the full Hund's rule coupling is included. In the absence of spin-flip and pair-exchange terms the lower transition remains first-order while the upper becomes continuous.

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