Greatly enhanced absorption of non-resonant microwave fields by ultracold molecules near a Feshbach resonance

TL;DR

This paper demonstrates that non-resonant microwave absorption by ultracold molecules is significantly increased near a Feshbach resonance, enabling new detection and control methods for ultracold molecular gases.

Contribution

It reveals a novel method to enhance microwave absorption near Feshbach resonances, allowing detection and tuning of ultracold molecular interactions.

Findings

Microwave absorption is dramatically enhanced near Feshbach resonances.

This enhancement can be used for resonance detection via microwave measurements.

Microwave fields can tune elastic scattering cross sections of ultracold molecules.

Abstract

We show that the probability of the collision-induced absorption of non-resonant microwave photons by a gas of ultracold molecules is dramatically enhanced near a Feshbach scattering resonance. This can be used for detecting Feshbach resonances of ultracold molecules by measuring the microwave field absorption and for tuning the elastic scattering cross sections of ultracold molecules by varying the frequency and intensity of the microwave field in a wide range of the field parameters.