Phase Diagrams of the Two-Orbital Hubbard Model with Different Bandwidths

Details Phase Diagrams of the Two-Orbital Hubbard Model with Different Bandwidths Phase Diagrams of the Two-Orbital Hubbard Model with Different Bandwidths

2006-03-17

arxiv.org/abs/cond-mat/0603470v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 12 figures

Scientific paper

We investigate the two-orbital Hubbard model in infinite dimensions by means of the self-energy functional method. By calculating the entropy, susceptibility, and quasi-particle weight at zero temperature, we determine the phase diagram for the system with same and different bandwidths, which is compared with that obtained recently. It is clarified that orbital fluctuations play a key role in controlling the nature of the Mott transitions in the system.

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