Radial and Angular Rotons in Trapped Dipolar Gases

Shai Ronen, Daniele C. E. Bortolotti, and John L. Bohn
Phys. Rev. Lett. 98, 030406 – Published 19 January 2007

Abstract

We study Bose-Einstein condensates with purely dipolar interactions in oblate traps. We find that the condensate always becomes unstable to collapse when the number of particles is sufficiently large. We analyze the instability, and find that it is the trapped-gas analogue of the “roton-maxon” instability previously reported for a gas that is unconfined in 2D. In addition, we find that under certain circumstances the condensate wave function attains a biconcave shape, with its maximum density away from the center of the gas. These biconcave condensates become unstable due to azimuthal excitation—an angular roton.

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  • Received 26 July 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.030406

©2007 American Physical Society

Authors & Affiliations

Shai Ronen

  • JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

Daniele C. E. Bortolotti

  • JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA
  • and LENS and Dipartimento di Fisica, Universitá di Firenze, Sesto Fiorentino, Italy

John L. Bohn*

  • JILA, NIST, and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

  • *Electronic address: bohn@murphy.colorado.edu

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Vol. 98, Iss. 3 — 19 January 2007

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