Direct observation of the phonon energy in a Bose-Einstein condensate by tomographic imaging

Details Direct observation of the phonon energy in a Bose-Einstein condensate by tomographic imaging Direct observation of the phonon energy in a Bose-Einstein condensate by tomographic imaging

2001-12-30

arxiv.org/abs/cond-mat/0112496v1

Physics

Condensed Matter

Soft Condensed Matter

Letter, 5 figures

Scientific paper

10.1103/PhysRevLett.88.220401

The momentum and energy of phonons in a Bose-Einstein condensate are measured
directly from a time-of-flight image by computerized tomography. We find that
the same atoms that carry the momentum of the excitation also carry the
excitation energy. The measured energy is in agreement with the Bogoliubov
spectrum. Hydrodynamic simulations are performed which confirm our observation.

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