Beliaev damping of quasiparticles in a Bose-Einstein condensate.
We report a measurement of the suppression of collisions of quasiparticles with ground state atoms within a Bose-Einstein condensate at low momentum. These collisions correspond to Beliaev damping of the excitations, in the previously unexplored regime of the continuous quasiparticle energy spectrum. We use a hydrodynamic simulation of the expansion dynamics, with the Beliaev damping cross section, in order to confirm the assumptions of our analysis.
Katz
N
N
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.
Steinhauer
J
J
Ozeri
R
R
Davidson
N
N