https://doi.org/10.1140/epjb/e2017-80115-7
Regular Article
Mott-Hubbard transition in the mass-imbalanced Hubbard model
Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
a
e-mail: marie.therese1@gmx.de
Received: 24 February 2017
Received in final form: 13 April 2017
Published online: 19 June 2017
The mass-imbalanced Hubbard model represents a continuous evolution from the Hubbard to the Falicov-Kimball model. We employ dynamical mean field theory and study the paramagnetic metal-insulator transition, which has a very different nature for the two limiting models. Our results indicate that the metal-insulator transition rather resembles that of the Hubbard model as soon as a tiny hopping between the more localized fermions is switched on. At low temperatures we observe a first-order metal-insulator transition and a three peak structure. The width of the central peak is the same for the more and less mobile fermions when approaching the phase transition, which agrees with our expectation of a common Kondo temperature and phase transition for the two species.
Key words: Solid State and Materials
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