Supersolid state of ultracold fermions in an optical lattice

Abstract

We study ultracold fermionic atoms trapped in an optical lattice with harmonic confinement by means of the dynamical mean-field approximation. It is demonstrated that a supersolid state, where an s-wave superfluid coexists with a density-wave state with a checkerboard pattern, is stabilized by attractive onsite interactions on a square lattice. Our new finding here is that a confining potential plays an invaluable role in stabilizing the supersolid state. We establish a rich phase diagram at low temperatures, which clearly shows how the insulator, the density wave and the superfluid compete with each other to produce an intriguing domain structure. Our results shed light on the possibility of the supersolid state in fermionic optical lattice systems.

5 pages, 4 figures

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Cited by in corpus (16)

• Physical properties of weak-coupling quasiperiodic superconductors
• Valence Fluctuations and Electric Reconstruction in the Extended Anderson Model on the Two-Dimensional Penrose Lattice
• Local Electron Correlations in a Two-dimensional Hubbard Model on the Penrose Lattice
• Supersolid state in fermionic optical lattice systems
• Polarized Superfluidity in the imbalanced attractive Hubbard model
• Low temperature properties of the fermionic mixtures with mass imbalance in optical lattice
• Superfluid state in the periodic Anderson model with attractive interactions
• Valence Fluctuations in the Extended Anderson Lattice Model with Quasiperiodicity
• Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions
• Mott transitions in the Hubbard model with spatially-modulated interactions
• Doped Mott insulator on Penrose tiling
• Resonance Effects in Correlated Multilayer Heterostructures
• Tunneling properties of a bound pair of Fermi atoms in an optical lattice
• Stability of FFLO states in optical lattices with bilayer structure
• Density-Wave and Antiferromagnetic States of Fermionic Atoms in Optical Lattices
• Thermodynamic properties of two-component fermionic atoms trapped in a two-dimensional optical lattice