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APS » Journals » Phys. Rev. Lett. » Volume 88 » Issue 6
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Phys. Rev. Lett. 88, 060402 (2002) [4 pages]

Experimental Observation of the Bogoliubov Transformation for a Bose-Einstein Condensed Gas

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J. M. Vogels, K. Xu, C. Raman*, J. R. Abo-Shaeer, and W. Ketterle†
Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Received 11 September 2001; published 28 January 2002

Phonons with wave vector q/ħ were optically imprinted into a Bose-Einstein condensate. Their momentum distribution was analyzed using Bragg spectroscopy with a high momentum transfer. The wave function of the phonons was shown to be a superposition of +q and -q free particle momentum states, in agreement with the Bogoliubov quasiparticle picture.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.060402
DOI:
10.1103/PhysRevLett.88.060402
PACS:
05.30.Jp, 03.75.Fi, 32.80.-t, 67.40.Db

*Current address: School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332.

†Group website: http://cua.mit.edu/ketterle_group/

 
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