Absence of Landau damping in driven three-component BoseEinstein condensate in optical lattices

作者：Shchedrin Gavriil^*; Jaschke Daniel; Carr Lincoln D

来源：Scientific Reports, 2018, 8(1): 11523.

DOI：10.1038/s41598-018-29454-y

We explore the quantum many-body physics of a three-component Bose-Einstein condensate in an optical lattice driven by laser fields in Lambda and. configurations. We obtain exact analytical expressions for the energy spectrum and amplitudes of elementary excitations, and discover symmetries among them. We demonstrate that the applied laser fields induce a gap in the otherwise gapless Bogoliubov spectrum. We find that Landau damping of the collective modes above the energy of the gap is carried by laser-induced roton modes and is considerably suppressed compared to the phonon-mediated damping endemic to undriven scalar condensates

• 出版日期2018-8-1