Physics – Condensed Matter – Superconductivity
Scientific paper
2008-12-11
Physics
Condensed Matter
Superconductivity
7 pages, 5 figures, Phys. Rev. A in press
Scientific paper
10.1103/PhysRevA.79.013607
We study ultracold fermionic atoms trapped in an optical lattice with harmonic confinement by combining the real-space dynamical mean-field theory with a two-site impurity solver. By calculating the local particle density and the pair potential in the systems with different clusters, we discuss the stability of a supersolid state, where an s-wave superfluid coexists with a density-wave state of checkerboard pattern. It is clarified that a confining potential plays an essential role in stabilizing the supersolid state. The phase diagrams are obtained for several effective particle densities.
Higashiyama Takuji
Inaba Kensuke
Kawakami Norio
Koga Akihisa
Suga Sei-ichiro
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