Spectroscopy of Superradiant scattering from an array of Bose-Einstein Condensates

TL;DR

This paper theoretically investigates superradiant scattering from Bose-Einstein condensates in an optical lattice, showing how spectroscopy can reveal coherence properties between sites.

Contribution

It introduces a method to measure wavefunction overlap and coherence in BEC arrays via scattering spectroscopy within a phase match condition.

Findings

Density grating amplifies scattering light within phase match

Spectroscopy in momentum space measures wavefunction overlap

Coherence between sites can be inferred from scattering patterns

Abstract

We theoretically study the superradiant gain and the direction of this coherent radiant for an array of Bose-Einstein condensates in an optical lattice. We find that the density grating is formed to amplify the scattering light within the phase match condition. The scattering spectroscopy in the momentum space can provide a method for measuring the overlap of wavefunction between the neighboring sites, which is related to their inner-site and inter-site coherence.