Mott-Hubbard transition in the mass-imbalanced Hubbard model

Marie-Therese Philipp (), Markus Wallerberger, Patrik Gunacker and Karsten Held
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Marie-Therese Philipp: Institute of Solid State Physics, TU Wien
Markus Wallerberger: Institute of Solid State Physics, TU Wien
Patrik Gunacker: Institute of Solid State Physics, TU Wien
Karsten Held: Institute of Solid State Physics, TU Wien

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 6, 1-7

Abstract: Abstract 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.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-80115-7

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