Detecting the breached pair phase in a polarized ultracold Fermi gas

TL;DR

This paper proposes an experimental method using time-of-flight Raman imaging to detect the breached pair phase in a polarized ultracold Fermi gas, based on momentum-space phase separation measurements.

Contribution

It introduces a novel detection technique for the breached pair state in ultracold Fermi gases, providing calculated density profiles to aid experimental verification.

Findings

Momentum-space phase separation indicates the breached pair phase.

Calculated density profiles under experimental conditions support detection feasibility.

Method enables unambiguous identification of the breached pair state.

Abstract

We propose a method for the experimental detection of a new quantum phase, the breached pair state, in a strongly interacting ultracold Fermi gas with population imbalance. We show that through the time-of-flight Raman imaging, the presence of such a phase can be unambiguously determined with a measurement of the momentum-space phase separation of the minority spin component. To guide the experimental efforts, the momentum-space density profiles are calculated under typical experimental conditions.