Geometric Stability Spectra of Dipolar Bose Gases in Tunable Optical Lattices
arXiv:1304.7022 · doi:10.1103/PhysRevA.88.013614
Abstract
We examine the stability of quasi-two-dimensional dipolar Bose-Einstein condensates in the presence of weak optical lattices of various geometries. We find that when the condensate possesses a roton-maxon quasiparticle dispersion, the conditions for stability exhibit a strong dependence both on the lattice geometry and the polarization tilt. This results in rich structures in the system's stability diagram akin to spectroscopic signatures. We show how these structures originate from the mode matching of rotons to the perturbing lattice. In the case of a one-dimensional lattice, some of the features emerge only when the polarization axis is tilted into the plane of the condensate. Our results suggest that the stability diagram may be used as a novel means to spectroscopically measure rotons in dipolar condensates.
9 pages, 5 figures
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Cited by in corpus (9)
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- Roton excitations in a trapped dipolar Bose-Einstein condensate
- Variational theory for the ground state and collective excitations of an elongated dipolar condensate
- A general theory of flattened dipolar condensates
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