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Collective Excitations in Quasi-2D and 3D Gases

Event Details

Event Dates: 

Friday, January 10, 2014 - 1:00pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Dan Lobser

Speaker Affiliation(s): 

JILA - Cornell group
Seminar Type/Subject

Scientific Seminar Type: 

  • Other

Seminar Type Other: 

Bi-group Seminar

Event Details & Abstract: 

Collective motion of a Bose-Einstein condensate has been a system of interest since the discovery of BEC. Boltzmann proved that the monopole mode of a thermal gas in an isotropic, harmonic and 3D trap is undamped.

BECs are not classical gases and their weakly interacting nature causes damping in a 3D monopole mode. However, experimental limitations have precluded studies of this behavior in very spherical traps.


When confined to lower dimensions, quantum gases exhibit remarkable physical properties such as the Berezkinskii-Kosterlitz-Thouless transition or the Tonks-Girardeau gas. Confinement effects in a quasi-2D condensate are predicted to shift the frequency of the monopole mode.

One effect in particular connects a small frequency shift with certain quantum corrections.