Experimental observation of the Bogoliubov transformation for a Bose-Einstein condensed gas

Details Experimental observation of the Bogoliubov transformation for a Bose-Einstein condensed gas Experimental observation of the Bogoliubov transformation for a Bose-Einstein condensed gas

2001-09-12

arxiv.org/abs/cond-mat/0109205v2

Phys.Rev.Lett. 88 (2002) 060402

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, please take postscript version for the best version of Fig 1

Scientific paper

10.1103/PhysRevLett.88.060402

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

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