Josephson oscillations between exciton condensates in electrostatic traps

TL;DR

This paper theoretically investigates Josephson oscillations between exciton condensates in electrostatic traps, highlighting how supercurrents are driven by dipole energy differences and how oscillations can be observed via photon correlations.

Contribution

It introduces a theoretical model for Josephson effects in exciton condensates in electrostatic traps, emphasizing the robustness of oscillations against fluctuations.

Findings

Josephson oscillations depend on trap coupling strength

Oscillations are observable through photon correlation measurements

Fringe visibility remains robust against quantum and thermal fluctuations

Abstract

Technological advances allow for tunable lateral confinement of cold dipolar excitons in coupled quantum wells. We consider theoretically the Josephson effect between exciton condensates in two traps separated by a weak link. The flow of the exciton supercurrent is driven by the dipole energy difference between the traps. The Josephson oscillations may be observed after ensemble average of the time correlation of photons separately emitted from the two traps. The fringe visibility is controlled by the trap coupling and is robust against quantum and thermal fluctuations.