Observation of dipolar splittings in high-resolution atom-loss spectroscopy of $^6$Li $p$-wave Feshbach resonances

TL;DR

This paper reports the observation of dipolar splittings in high-resolution atom-loss spectroscopy of $^6$Li p-wave Feshbach resonances, revealing a doublet structure linked to angular momentum projections, with implications for quantum phase transitions.

Contribution

The study provides the first high-resolution measurement of dipolar splitting in $^6$Li p-wave Feshbach resonances, confirming coupled-channel calculations and mapping temperature dependence.

Findings

Dipolar splitting observed at 159 G and 215 G Feshbach resonances.

Splitting magnitudes of 10 mG and 13 mG match theoretical predictions.

Temperature dependence allows extrapolation of resonance properties.

Abstract

We report on the observation of dipolar splitting in 6Li p-wave Feshbach resonances by highresolution atom-loss spectroscopy. The Feshbach resonances at 159 G and 215 G exhibit a doublet structure of 10 mG and 13 mG, respectively, associated with different projections of the orbital angular momentum. The observed splittings agree very well with coupled-channel calculations. We map out the temperature dependence of the atom-loss spectrum allowing us to extrapolate resonance positions and the corresponding widths to zero temperature. The observed dipolar splitting in fermionic lithium might be useful for the realization of the quantum phase transition between the polar and axial p-wave superfluid phases.