TY - JOUR
AU - Shai Ronen
AU - D. Bortolotti
AU - John Bohn
AB - 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.
BT - Physical Review Letters
DA - 2007-01
DO - 10.1103/PhysRevLett.98.030406
N2 - 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.
PY - 2007
EP - 030406
T2 - Physical Review Letters
TI - Radial and Angular Rotons in Trapped Dipolar Gases
VL - 98
SN - 0031-9007
ER -