Interferometric probe of paired states

TL;DR

This paper introduces an interference-based method to detect and analyze paired states in low-dimensional quantum systems, enabling phase-sensitive identification of pairing symmetries such as FFLO and d-wave.

Contribution

The authors present a novel interference technique for detecting paired states and determining pairing symmetry in bosonic and fermionic low-dimensional systems.

Findings

Can detect FFLO and d-wave paired states in fermions

Applicable to quasicondensates of singlet pairs in polar F=1 atoms

Enables phase-sensitive pairing symmetry analysis

Abstract

We propose a new method for detecting paired states in either bosonic or fermionic systems using interference experiments with independent or weakly coupled low dimensional systems. We demonstrate that our method can be used to detect both the FFLO and the d-wave paired states of fermions, as well as quasicondensates of singlet pairs for polar F=1 atoms in two dimensional systems. We discuss how this method can be used to perform phase-sensitive determination of the symmetry of the pairing amplitude.