Damping-free collective oscillations of a driven two-component Bose gas in optical lattices
作者： Gavriil Shchedrin , Daniel Jaschke , Lincoln D. Carr
DOI: 10.1103/PHYSREVA.97.043601
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摘要: We explore quantum many-body physics of a driven Bose-Einstein condensate in optical lattices. The laser field induces gap the generalized Bogoliubov spectrum proportional to effective Rabi frequency. lowest lying modes are characterized by zero group velocity and non-zero current. Thus, roton modes, which carry interaction condensate. show that collective excitations below energy laser-induced remain undamped, while above they significantly suppressed Landau damping rate.
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