High sensitivity phonon spectroscopy of Bose-Einstein condensates using matter-wave interference

Details High sensitivity phonon spectroscopy of Bose-Einstein condensates using matter-wave interference High sensitivity phonon spectroscopy of Bose-Einstein condensates using matter-wave interference

2004-05-11

arxiv.org/abs/cond-mat/0405222v2

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 5 figures, author list updated

Scientific paper

10.1103/PhysRevLett.93.220403

We study low momentum excitations of a Bose-Einstein condensate using a novel matter-wave interference technique. In time-of-flight expansion images we observe strong matter-wave fringe patterns. The fringe contrast is a sensitive spectroscopic probe of in-trap phonons and is explained by use of a Bogoliubov excitation projection method applied to the rescaled order parameter of the expanding condensate. Gross-Pitaevskii simulations agree with the experimental data and confirm the validity of the theoretical interpretation. We show that the high sensitivity of this detection scheme gives access to the quantized quasiparticle regime.

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