We present a microscopic theory of thermally-damped vortex motion in oblate atomic superfluids that accounts for previously neglected number-conserving interactions between superfluid and thermal atoms. This mechanism causes dissipation of vortex energy due to mutual friction, as well as Brownian motion of vortices due to thermal fluctuations. We present an analytic expression for the dimensionless mutual friction coefficient that gives excellent quantitative agreement with experimentally measured values, without any fitted parameters. Our work provides a microscopic origin for the damping and Brownian motion of quantized vortices in two-dimensional atomic superfluids, which has previously been limited to phenomenology.
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|Presenter name||Zain Mehdi|