Collective Excitations of a Bose-Einstein Condensate in a Magnetic Trap
1996; American Physical Society; Volume: 77; Issue: 6 Linguagem: Inglês
10.1103/physrevlett.77.988
ISSN1092-0145
AutoresM.‐O. Mewes, M. R. Andrews, N. J. van Druten, Dan Stamper-Kurn, Dallin Durfee, C. G. Townsend, Wolfgang Ketterle,
Tópico(s)Atomic and Subatomic Physics Research
ResumoCollective excitations of a dilute Bose condensate have been observed. These excitations are analogous to phonons in superfluid helium. Bose condensates were created by evaporatively cooling magnetically trapped sodium atoms. Excitations were induced by a modulation of the trapping potential, and detected as shape oscillations in the freely expanding condensates. The frequencies of the lowest modes agreed well with theoretical predictions based on mean-field theory. Before the onset of Bose-Einstein condensation, we observed sound waves in a dense ultracold gas.
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