Roton-roton crossover in strongly correlated dipolar Bose-nonstnon condensates
Hufnagl, D., Kaltsnos, R., Apaja, V., & Zillich, R. (2011). Roton-roton crossover in strongly correlated dipolar Bose-nonstnon condensates. Physical Review Letters, 107(6), Article 065303. https://doi.org/10.1103/PhysRevLett.107.065303
Julkaistu sarjassa
Physical Review LettersPäivämäärä
2011Tekijänoikeudet
© 2011 American Physical Society. Published in this repository with the kind permission of the publisher.
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We study the pair correlations and excitations of a dipolar Bose gas layer. The anisotropy of the dipole-dipole interaction allows us to tune the strength of pair correlations from strong to weak perpendicular and weak to strong parallel to the layer by increasing the perpendicular trap frequency. This change is accompanied by a roton-roton crossover in the spectrum of collective excitations, from a roton caused by the head-to-tail attraction of dipoles to a roton caused by the side-by-side repulsion, while there is no roton excitation for intermediate trap frequencies. We discuss the nature of these two kinds of rotons and the relation to instabilities of dipolar Bose gases. In both regimes of trap frequencies where rotons occur, we observe strong damping of collective excitations by decay into two rotons.
Julkaisija
American Physical SocietyISSN Hae Julkaisufoorumista
1079-7114Asiasanat
Alkuperäislähde
http://link.aps.org/doi/10.1103/PhysRevLett.107.065303Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/21375229
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