Flow-Induced Charge Modulation in Superfluid Atomic Fermions Loaded into an Optical Kagome Lattice
arXiv:1212.2299 · doi:10.1103/PhysRevLett.110.145304
Abstract
We study the superfluid state of atomic fermions in a tunable optical kagome lattice motivated by recent experiments. We show that imposed superflow induces spatial modulations in the density and order parameter of the pair condensate and leads to a charge modulated superfluid state analogous to a supersolid state. The spatial modulations in the superfluid emerge due to the geometric effect of the kagome lattice that introduces anisotropy in hopping amplitudes of fermion pairs in the presence of superflow. We also study superflow instabilities and find that the critical current limited by the dynamical instability is quite enhanced due to the large density of states associated with the flatband. The charge modulated superfluid state can sustain high temperatures close to the transition temperature that is also enhanced due to the flatband, and is therefore realizable in experiments.
4+3 pages, 5 figures
References in corpus (24)
- Many-Body Physics with Ultracold Gases
- High temperature fractional quantum Hall states
- Spin-lattice coupling in frustrated antiferromagnets
- Ultracold Atoms in a Tunable Optical Kagome Lattice
- Superfluid and Dissipative Dynamics of a Bose-Einstein Condensate in a Periodic Optical Potential
- Observation of dynamical instability for a Bose-Einstein condensate in a moving 1D optical lattice
- Bose condensation in flat bands
- Strongly inhibited transport of a 1D Bose gas in a lattice
- Band structure, elementary excitations, and stability of a Bose-Einstein condensate in a periodic potential
- Observation of a two-dimensional Fermi gas of atoms
- Critical velocity for superfluid flow across the BEC-BCS crossover
- BCS-BEC crossover on the two-dimensional honeycomb lattice
- Ultracold Fermions in a Graphene-Type Optical Lattice
- Phase diagram for a Bose-Einstein condensate moving in an optical lattice
- Superconductivity from Flat Dispersion Designed in Doped Mott Insulators
- Bogoliubov sound speed in periodically modulated Bose-Einstein condensates
- Sound propagation and oscillations of a superfluid Fermi gas in the presence of a 1D optical lattice
- Collective modes and superflow instabilities of strongly correlated Fermi superfluids
- Superfluid Fermi gas in a 1D optical lattice
- Stability of Superflow for Ultracold Fermions in Optical Lattices
- Critical velocity of flowing supersolids of dipolar Bose gases in optical lattices
- Instability of superfluid Fermi gases induced by a roton-like density mode in optical lattices
- Superfluidity of Dirac Fermions in a Tunable Honeycomb Lattice: Cooper Pairing, Collective Modes, and Critical Currents
- Quenching the Superconducting State of Cuprate Compounds with Electric Currents: A Variational Study
Cited by in corpus (6)
- Quantum transport in ultracold atoms
- Dynamically generated flat-band phases in optical kagome lattices
- Magnetism in the three-dimensional layered Lieb lattice: Enhanced transition temperature via flat-band and Van Hove singularities
- Spin-Imbalanced Pairing and Fermi Surface Deformation in Flat Bands
- Collective excitation and stability of flow-induced gapless Fermi superfluids
- Topological Aspects of Dirac Fermions in a Kagomé Lattice