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arXiv · 1705.10199

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

Gavriil Shchedrin·Daniel Jaschke·Lincoln D. Carr
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Abstract

We explore the quantum many-body physics of a three-component Bose-Einstein condensate (BEC) in an optical lattices driven by laser fields in $V$ and $\Lambda$ 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 BECs.

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Gavriil Shchedrin, Daniel Jaschke, Lincoln D. Carr. 2017-05-26. Absence of Landau damping in driven three-component Bose-Einstein condensate in optical lattices. https://doi.org/10.1038/s41598-018-29454-y

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