Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2001-12-30
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.
Davidson Nir
Katz Nadav
Ozeri Roee
Steinhauer Jeff
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