Detecting paired and counterflow superfluidity via dipole oscillations

TL;DR

This paper proposes an experimentally feasible method to detect paired and counterflow superfluidity in ultra-cold atom systems by analyzing their distinct dynamic responses to potential displacements.

Contribution

It introduces a new experimental procedure to distinguish superfluid phases in cold atom mixtures through their dynamic behavior after potential shifts.

Findings

Distinct dynamic responses for paired and counterflow superfluids

Qualitative differences in response to potential displacement

Provides an intuitive understanding of superfluid phase dynamics

Abstract

We suggest an experimentally feasible procedure to observe paired and counterflow superfluidity in ultra-cold atom systems. We study the time evolution of one-dimensional mixtures of bosonic atoms in an optical lattice following an abrupt displacement of an additional weak confining potential. We find that the dynamic responses of the paired superfluid phase for attractive inter-species interactions and the counterflow superfluid phase for repulsive interactions are qualitatively distinct and reflect the quasi long-range order that characterizes these states. These findings suggest a clear experimental procedure to detect these phases, and give an intuitive insight into their dynamics.