Polarized Superfluidity in the imbalanced attractive Hubbard model

Details Polarized Superfluidity in the imbalanced attractive Hubbard model Polarized Superfluidity in the imbalanced attractive Hubbard model

2010-02-16

arxiv.org/abs/1002.2958v1

J. Phys. Soc. Jpn. 79, 064401 (2010)

Physics

Condensed Matter

Quantum Gases

7 pages and 8 figures

Scientific paper

10.1143/JPSJ.79.064401

We investigate the attractive Hubbard model in infinite spatial dimensions by means of dynamical mean-field theory. Using a continuous-time Monte Carlo algorithm in the Nambu formalism as an impurity solver, we directly deal with the superfluid phase in the population imbalanced system. By calculating the superfluid order parameter, the magnetization, and the density of states, we discuss how the polarized superfluid state is realized in the attractive Hubbard model at quarter filling. We find that a drastic change in the density of states is induced by spin imbalanced populations in the superfluid state.

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