Title

Controllable friction of dark solitons in Bose-Fermi mixtures

Publication Date

3-13-2017

Document Type

Presentation

Department

Physics and Astronomy

Disciplines

Atomic, Molecular and Optical Physics

Publication Title

American Physical Society March Meeting 2017

Conference Location

New Orleans, LA

Abstract

We study controllable friction in a system consisting of a dark soliton in a one-dimensional Bose gas and a non-interacting, degenerate Fermi gas. The fermions act as impurity atoms, not part of the original condensate, that scatter off of the soliton. We study semi-classical dynamics of the dark soliton by treating it as a particle with negative mass, and calculate its friction coefficient. Surprisingly, the amount of friction depends on the ratio of interspecies (impurity-condensate) to intraspecies (condensate-condensate) interaction strengths. By tuning this ratio, one can access a regime where the friction coefficient vanishes. We compare our results to experimental regimes and conclude that tunable friction has measurable physical consquences in experiments with Bose-Fermi mixtures.

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