Darmstadt 2008 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 40: Quantengase (Bosonen I)
Q 40.4: Talk
Thursday, March 13, 2008, 14:45–15:00, 1A
Transverse instability of straight vortex lines in dipolar Bose-Einstein condensates — •Michael Klawunn1, Rejish Nath1, Paolo Pedri2, and Luis Santos1 — 1Institut für Theoretische Physik , Leibniz Universität Hannover, Appelstr. 2, D-30167, Hannover, Germany — 2Laboratoire de Physique Theorique et Modeles Statistiques, Universite Paris Sud, 91405 Orsay Cedex, France
The physics of vortex lines in dipolar condensates is studied. Due to the nonlocality of the dipolar interaction, the 3D character of the vortex plays a more important role in dipolar gases than in typical short-range interacting ones. In particular, the dipolar interaction significantly affects the stability of the transverse modes of the vortex line. Remarkably, in the presence of a periodic potential along the vortex line, the spectrum of transverse modes shows a roton minimum, which eventually destabilizes the straight vortex when the BEC as a whole is still stable, opening the possibility for new scenarios for vortex-line configurations in dipolar gases.