High Temperature Universal Properties of Atomic Gases Near Feshbach Resonance with Non-Zero Orbital Angular Momentum

TL;DR

This paper reveals that atomic gases near non-zero angular momentum Feshbach resonances exhibit a distinct universal high-temperature behavior, with interaction energies significantly different from s-wave cases, and proposes experimental verification.

Contribution

It identifies a new universality class for high-temperature atomic gases near non-zero angular momentum Feshbach resonances, highlighting differences from s-wave resonances.

Findings

Universal interaction energy is 2(2ℓ+1) times larger than s-wave near resonance.

Interaction energy is nearly zero on the molecular side for ℓ>0.

Measurement of these properties is feasible with current experimental setups.

Abstract

We show that the high temperature behavior of atomic gases near Feshbach Resonance with non-zero orbital angular momentum $(\ell >0)$ belong to a universality class different from that of s-wave resonances. The universal interaction energy is $2(2\ell +1)$ times larger than that of the s-wave when approaching the resonance from the atomic side, but is essentially zero on the molecular side; contrary to s-wave resonances where interaction energies on both sides are the same except for a sign change. The measurement of these universality properties should be feasible in current experiments.