Exotic roton excitations in quadrupolar Bose–Einstein condensates

M. Lahrz, M. Lemeshko, L. Mathey, New Journal of Physics 17 (2015) 045005.

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Journal Article | Published | English
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Abstract
We investigate the occurrence of rotons in a quadrupolar Bose–Einstein condensate confined to two dimensions. Depending on the particle density, the ratio of the contact and quadrupole–quadrupole interactions, and the alignment of the quadrupole moments with respect to the confinement plane, the dispersion relation features two or four point-like roton minima or one ring-shaped minimum. We map out the entire parameter space of the roton behavior and identify the instability regions. We propose to observe the exotic rotons by monitoring the characteristic density wave dynamics resulting from a short local perturbation, and discuss the possibilities to detect the predicted effects in state-of-the-art experiments with ultracold homonuclear molecules.
Publishing Year
Date Published
2015-04-01
Journal Title
New Journal of Physics
Volume
17
Issue
4
Article Number
045005
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Lahrz M, Lemeshko M, Mathey L. Exotic roton excitations in quadrupolar Bose–Einstein condensates . New Journal of Physics. 2015;17(4):045005. doi:10.1088/1367-2630/17/4/045005
Lahrz, M., Lemeshko, M., & Mathey, L. (2015). Exotic roton excitations in quadrupolar Bose–Einstein condensates . New Journal of Physics, 17(4), 045005. https://doi.org/10.1088/1367-2630/17/4/045005
Lahrz, Martin, Mikhail Lemeshko, and Ludwig Mathey. “ Exotic Roton Excitations in Quadrupolar Bose–Einstein Condensates .” New Journal of Physics 17, no. 4 (2015): 045005. https://doi.org/10.1088/1367-2630/17/4/045005.
M. Lahrz, M. Lemeshko, and L. Mathey, “ Exotic roton excitations in quadrupolar Bose–Einstein condensates ,” New Journal of Physics, vol. 17, no. 4, p. 045005, 2015.
Lahrz M, Lemeshko M, Mathey L. 2015. Exotic roton excitations in quadrupolar Bose–Einstein condensates . New Journal of Physics. 17(4), 045005.
Lahrz, Martin, et al. “ Exotic Roton Excitations in Quadrupolar Bose–Einstein Condensates .” New Journal of Physics, vol. 17, no. 4, IOP Publishing Ltd., 2015, p. 045005, doi:10.1088/1367-2630/17/4/045005.
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