Damping-free collective oscillations of a driven two-component Bose gas in optical lattices
arXiv:1610.09076 · doi:10.1103/PhysRevA.97.043601
Abstract
We explore quantum many-body physics of a driven Bose-Einstein condensate in optical lattices. The laser field induces a gap in the generalized Bogoliubov spectrum proportional to the effective Rabi frequency. The lowest lying modes in a driven condensate are characterized by zero group velocity and non-zero current. Thus, the laser field induces roton modes, which carry interaction in a driven condensate. We show that collective excitations below the energy of the laser-induced gap remain undamped, while above the gap they are characterized by a significantly suppressed Landau damping rate.
References in corpus (9)
- Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
- Collective excitations of a degenerate gas at the BEC-BCS crossover
- Observation of Dirac Monopoles in a Synthetic Magnetic Field
- A Mixture of Bose and Fermi Superfluids
- Rabi switch of condensate wavefunctions in a multicomponent Bose gas
- Quasi-particle Lifetime in a Mixture of Bose and Fermi Superfluids
- Chiral spin superfluidity and spontaneous spin Hall effect of interacting bosons
- Dynamics of correlations in a quasi-2D dipolar Bose gas following a quantum quench
- Damping of long wavelength collective modes in spinor Bose-Fermi mixtures