Supersolid state in a fermionic optical lattice system

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We study ultracold fermionic atoms loaded in an optical lattice with a confining potential. By combining dynamical mean-field approximation with a two-site impurity solver, we demonstrate that a supersolid state, where an s-wave superfluid coexists with a density-wave state of checkerboard pattern, is stabilized by attractive onsite interactions on a square lattice. The stability of the supersolid state in the thermodynamic limit is also addressed.

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