Spectroscopy of Strong-Pulse Superradiance in a Bose-Einstein condensate

TL;DR

This paper experimentally investigates superradiance in a Bose-Einstein condensate using a two-frequency pump, analyzing the spectrum and dynamics of backward modes and comparing results with a semi-classical model.

Contribution

It introduces a method to control and measure the spectrum of backward superradiant modes in a BEC with a two-frequency pump, revealing coherent dynamics.

Findings

Measured the spectrum of backward superradiant modes.

Observed coherent time-dynamics of mode populations.

Compared experimental results with a semi-classical model.

Abstract

We study experimentally superradiance in a Bose-Einstein condensate using a two-frequency pump beam. By controlling the frequency difference between the beam components, we measure the spectrum of the backward (energy-mismatched) superradiant atomic modes. In addition, we show that the populations of these modes display coherent time-dynamics. These results are compared to a semi-classical model based on coupled Schroedinger-Maxwell equations.