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Low-Temperature Properties of the Fermionic Mixtures with Mass Imbalance in Optical Lattice

We study the attractive Hubbard model with mass imbalance to clarify the low-temperature properties of fermionic mixtures in an optical lattice. By combining dynamical mean-field theory with continuous-time quantum Monte Carlo simulation, we discuss the competition between the superfluid and density...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2012-06, Vol.81 (6), p.063002-063002-4
Main Authors: Takemori, Nayuta, Koga, Akihisa
Format: Article
Language:English
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Summary:We study the attractive Hubbard model with mass imbalance to clarify the low-temperature properties of fermionic mixtures in an optical lattice. By combining dynamical mean-field theory with continuous-time quantum Monte Carlo simulation, we discuss the competition between the superfluid and density wave states at half filling. By calculating the energy and order parameter for each state, we clarify that the coexisting (supersolid) state, where the density wave and superfluid states are degenerate, is realized in the system. We then determine the phase diagram at finite temperatures.
ISSN:0031-9015
1347-4073
DOI:10.1143/JPSJ.81.063002