Excitation of phonons in a Bose-Einstein condensate by light scattering
D.M. Stamper-Kurn, A.P. Chikkatur, A. G\"orlitz, S. Inouye, S. Gupta,, D.E. Pritchard, and W. Ketterle
TL;DR
This paper uses light scattering to measure phonon excitations in a Bose-Einstein condensate, revealing reduced excitation strength due to correlations and quantum depletion, with results matching theoretical predictions.
Contribution
It provides experimental evidence of correlated pair excitations and quantum depletion in a BEC through light scattering measurements.
Findings
Reduced phonon excitation strength compared to free particles
Presence of correlated pair excitations and quantum depletion
Agreement of Bragg resonance line with local density approximation
Abstract
Stimulated small-angle light scattering was used to measure the structure factor of a Bose-Einstein condensate in the phonon regime. The excitation strength for phonons was found to be significantly reduced from that of free particles, revealing the presence of correlated pair excitations and quantum depletion in the condensate. The Bragg resonance line strength and line shift agreed with predictions of a local density approximation.
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