Collective excitations of a Bose-Einstein condensate in a magnetic trap
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| Publication date | 1996 |
| Journal | Physical Review Letters |
| Volume | Issue number | 77 | 6 |
| Pages (from-to) | 988-991 |
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| Abstract | Collective 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. |
| Document type | Article |
| Note | (c)2000 American Physical Society |
| Published at |
https://doi.org/10.1103/PhysRevLett.77.988
(Final published version)
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