Journal
NEW JOURNAL OF PHYSICS
Volume 17, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/17/4/045005
Keywords
quadrupolar quantumgas; quadrupole-quadrupole interaction; rotons; homonuclear molecules
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Funding
- Deutsche Forschungsgemeinschaft [SFB 925]
- Hamburg Centre for Ultrafast Imaging
- Landesexzellenzinitiative Hamburg - Joachim Herz Stiftung
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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.
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