Collisions of bosonic ultracold polar molecules in microwave traps

TL;DR

This paper theoretically analyzes collisions of bosonic ultracold polar molecules in microwave traps, demonstrating the trap's advantages for evaporative cooling and safe trapping of molecules in various states depending on the microwave frequency.

Contribution

It introduces a theoretical framework for understanding molecular collisions in microwave traps and shows the trap's effectiveness across a range of frequencies for different molecular states.

Findings

Microwave traps facilitate successful evaporative cooling of polar molecules.

Molecules in various states can be trapped depending on the microwave frequency.

Microwave traps are advantageous compared to other trapping methods.

Abstract

The collisions between linear polar molecules, trapped in a microwave field with circular polarization, are theoretically analyzed. The microwave trap suggested by DeMille \cite{DeMille} seems to be rather advantageous in comparison with other traps. Here we have demonstrated that the microwave trap can provide a successful evaporative cooling for polar molecules in a rather broad range of frequencies of the AC-field. We suggested that not only ground state polar molecules but also molecules in some other states can be safely trapped. But the state in which molecules can be safely loaded and trapped depends on the frequency of the AC-field.