Dissipative dynamics of a kink state in a Bose-condensed gas
P.O. Fedichev, A.E. Muryshev, G.V. Shlyapnikov
TL;DR
This paper develops a theory describing how a kink state in a finite-temperature Bose-condensed gas dissipates over time, accelerating and transforming into the ground state due to thermal cloud interactions.
Contribution
It introduces a new theoretical framework for understanding dissipative kink dynamics in Bose gases at finite temperature.
Findings
Kink states accelerate towards the speed of sound due to thermal interactions.
The lifetime of a kink in a trapped gas is quantitatively estimated.
Kinks eventually transform into the ground-state condensate over time.
Abstract
We develop a theory of dissipative dynamics of a kink state in a finite-temperature Bose-condensed gas. We find that due to the interaction with the thermal cloud the kink state accelerates towards the velocity of sound and continuously transforms to the ground-state condensate. We calculate the life-time of a kink state in a trapped gas and discuss possible experimental implications.
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