Prediction of the quantization of magnetic flux in double layer exciton superfluids

TL;DR

This paper predicts that double layer exciton superfluids exhibit a unique flux quantization related to their diamagnetic response, providing a potential method to detect phase coherence in exciton condensates.

Contribution

It introduces a novel flux quantization phenomenon in exciton superfluids, linking magnetic flux to diamagnetic susceptibility in specific device geometries.

Findings

Double layer exciton superfluids show diamagnetic response.

Magnetic flux is quantized in units of h/e times susceptibility.

Potential experimental setups for observing flux quantization are discussed.

Abstract

Currently a way is lacking to detect unambiguously the possible phase coherence of an exciton condensate in an electron-hole double layer. Here we show that despite the fact that excitons are charge-neutral, the double layer exciton superfluid exhibits a diamagnetic response. In devices with specific circular geometry the magnetic flux threading between the layers must be quantized in units of $\frac{h}{e} \chi_m$ where $\chi_m$ is the diamagnetic susceptibility of the device. We discuss possible experimental realizations of the predicted unconventional flux quantization.