Finite-temperature vortex dynamics in Bose-Einstein condensates

摘要: We study the dynamics of a vortex in an atomic Bose-condensed gas at finite temperature within Zaremba-Nikuni-Griffin formalism. In harmonically trapped pancake-shaped condensate, off-centered is known to decay by spiraling out toward edge condensate. quantify dependence this on temperature, collisions, and thermal cloud rotation. Near trap center where density varies slowly, we show that our numerical results agree with predictions Hall-Vinen phenomenological friction force model used describe quantized vorticity superfluid systems. Our result thus clarifies microscopic origin provides ab initio determination its value.