Coherent Output, Stimulated Quantum Evaporation, and Pair Breaking in a Trapped Atomic Bose Gas
Yonathan Japha, Seok Jin Choi, Keith R. Burnett +1 more
We investigate the spectrum and coherence of an atomic beam slowly coupled out of an atomic trap which contains a partially condensed Bose gas at a finite temperature. The spectrum contains a coherent fraction emerging from the condensate and a thermal fraction emerging from the thermal excitations in the trap. We show the existence of a remarkable process involving the simultaneous creation of an output atom and an elementary excitation (quasiparticle) inside the trap. This process, which can serve as a probe to pair correlations in the condensate, can become dominant for a suitable choice of the coupling parameters.
Physical Review Letters•Feb 8, 1999•32 citations