Cooling a strongly-interacting quantum gas by interaction modulation

TL;DR

This paper introduces a novel cooling technique for strongly-interacting quantum gases using magnetic field modulation to selectively remove high-energy dimers, achieving unprecedented cooling efficiency near Feshbach resonances.

Contribution

The study demonstrates a new interaction modulation method for cooling quantum gases, surpassing previous efficiencies and applicable across various interaction strengths.

Findings

Achieved high cooling efficiency of γ=4, exceeding previous methods.

Successfully cooled quantum gases over a wide range of interaction strengths.

Demonstrated selective removal of high-energy dimers via magnetic field modulation.

Abstract

We present a cooling method for a strongly-interacting trapped quantum gas. By applying a magnetic field modulation with frequencies close to the binding energy of a molecular bound state we selectively remove dimers with high kinetic energy from the sample. We demonstrate cooling of the sample over a wide range of interaction strengths and measure a high cooling efficiency of $\gamma=4$ that exceeds all previous cooling near Feshbach resonances.