Katz N, Steinhauer J, Ozeri R, Davidson N
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.
Phys Rev Lett. 2002 Nov 25;89(22):220401. doi: 10.1103/PhysRevLett.89.220401. Epub 2002 Nov 6.
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.
我们报告了在低动量下对玻色 - 爱因斯坦凝聚体中准粒子与基态原子碰撞抑制的测量。这些碰撞对应于激发的贝利耶夫阻尼，处于连续准粒子能谱此前未被探索的区域。我们使用包含贝利耶夫阻尼截面的膨胀动力学流体动力学模拟，以确认我们分析的假设。
