Ferron dynamics in ultracold atomic gas

Abstract

We show that the motion of spin-polarized impurity (ferron) in ultracold atomic gas is characterized by a certain critical velocity which can be traced back to the amount of spin imbalance inside the impurity. We have calculated the effective mass of ferron in 2D. We show that the effective mass scales with the surface of the ferron and in general it scales as M_eff∝R^D−1, where D is the dimensionality of the system. We discuss the impact of these findings, in particular we demonstrate that ferrons become unstable in the vicinity of a vortex.

https://arxiv.org/abs/2102.04833