TY - JOUR
T1 - Quantum enhancement of higher-order phononlike excitations of a bose-einstein condensate
AU - Rowen, E. E.
AU - Bar-Gill, N.
AU - Davidson, N.
PY - 2008/7/3
Y1 - 2008/7/3
N2 - In a Bose-Einstein condensate, the excitation of a Bogoliubov phonon with low momentum (e.g., by a two-photon Bragg process) is strongly suppressed due to destructive interference between two indistinguishable excitation pathways. Here we show that scattering of this sound excitation into a double-momentum mode is strongly enhanced due to constructive interference. This enhancement yields an inherent amplification of second-order sound excitations of the condensate, as we confirm experimentally. We further show that due to parity considerations, this effect is extended to higher-order excitations.
AB - In a Bose-Einstein condensate, the excitation of a Bogoliubov phonon with low momentum (e.g., by a two-photon Bragg process) is strongly suppressed due to destructive interference between two indistinguishable excitation pathways. Here we show that scattering of this sound excitation into a double-momentum mode is strongly enhanced due to constructive interference. This enhancement yields an inherent amplification of second-order sound excitations of the condensate, as we confirm experimentally. We further show that due to parity considerations, this effect is extended to higher-order excitations.
UR - http://www.scopus.com/inward/record.url?scp=46949085578&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.101.010404
DO - 10.1103/PhysRevLett.101.010404
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AN - SCOPUS:46949085578
SN - 0031-9007
VL - 101
JO - Physical Review Letters
JF - Physical Review Letters
IS - 1
M1 - 010404
ER -