Disorder-Induced Phase Control in Superfluid Fermi-Bose Mixtures

TL;DR

This paper explores how spatially random coupling in a superfluid Fermi-Bose mixture can induce control over their relative phase, demonstrating a disorder-induced order phenomenon in ultracold quantum gases.

Contribution

It introduces a novel mechanism of phase control via disorder-induced symmetry breaking in Fermi-Bose mixtures with continuous U(1) symmetry.

Findings

Disorder can control the relative phase between superfluid and molecular condensates.

The mechanism operates below the BCS critical temperature.

It exemplifies disorder-induced order phenomena in quantum gases.

Abstract

We consider a mixture of a superfluid Fermi gas of ultracold atoms and a Bose-Einstein condensate of molecules possessing a continuous U(1) (relative phase) symmetry. We study the effects that a spatially random photo-associative-dissociative symmetry breaking coupling of the systems. Such coupling allows to control the relative phase between a superfluid order parameter of the Fermi system and the condensate wavefunction of molecules for temperatures below the BCS critical temperature. The presented mechanism of phase control belongs to the general class of disorder-induced order phenomena that rely on breaking of continuous symmetry.