Quadrupole Modes in Bose-Einstein Condensate

Brian Jackson, E. Zaremba

Vassos Achilleos, Theodoros P. Horikis, Georgios Theocharis +2 more

Chuan-Hsun Li, David Blasing, Yong Chen

Vincent Bretin, P. Rosenbusch, Frédéric Chevy +2 more

We study the two transverse quadrupole modes of a cigar-shaped Bose-Einstein condensate with a single centered vortex. We show that the counterrotating mode is more strongly damped than in the absence of a vortex, whereas the corotating mode is not affected appreciably by the vortex. We interpret this result as a decay of the counterrotating quadrupole mode into two excitations of the vortex line, the so-called Kelvin modes. This is supported by direct observation of the vortex line.

Ostrovskaya, Yuri S. Kivshar, Lisak +3 more

Masahiro Yamazaki, Kazuki Wakayama, Miho Harada +1 more

Using an additional off-axis Helmholtz coil, we modulated the strength of a magnetic field at the center of a cloverleaf trap for sodium Bose–Einstein condensates so that it passed through zero for a few milliseconds. At a modulation time of 1 ms, a scissors mode and a high-lying quadrupole mode were generated independently, which had the same Landau damping rates of 39(10) 1/s. However, at 2 ms, alternate oscillation between the scissors mode and the high-lying quadrupole mode, whose frequency was twice that of the scissors mode, was observed with the frequency of the low-lying quadrupole mode.