Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2005-04-29
Phys. Rev. A 72, 065602 (2005)
Physics
Condensed Matter
Statistical Mechanics
v2: added curve to figures; slightly revised discussion; minor editorial changes
Scientific paper
10.1103/PhysRevA.72.065602
We propose a method to probe Landau and Beliaev processes in dilute trapped atomic condensates with a multiple state structure using ultraslow light experimental configurations. Under certain conditions, damping rates from these collisional processes are directly proportional to the dephasing rates, making it possible to determine damping rates through measurement of the dephasing. In the ultraslow light systems we consider, Landau decay rates are enhanced at low momenta, which allows one to distinguish between Landau-dominated and Beliaev-dominated regimes at the same temperature. Furthermore, the enhancement of Landau rates potentially provides a way to measure low temperatures ($T \ll T_c$) in dilute condensates more accurately than current methods permit.
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