Abstract
Abstract We investigate magnetic properties of the two-band Hubbard model with different bandwidths. By means of dynamical mean-field theory combined with the hybridization expansion continuous time quantum Monte Carlo method, we discuss how the difference in the bandwidths affects the magnetism at low temperatures. It is found that the nature of the magnetic phase transition is not affected by the difference in the bandwidths at half filling and thus a single phase transition occurs at the same critical temperature. By contrast, the introduction of holes induces an orbital-selective insulator–metal transition. The characteristic properties of the intermediate phase with one orbital localized and the other itinerant are also discussed.
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