Precision Measurement of Spin-Dependent Dipolar Splitting in $^6$Li p-Wave Feshbach Resonances

TL;DR

This study precisely measures the spin-dependent dipolar splitting in ultracold 6Li p-wave Feshbach resonances, revealing spin-dependent behavior crucial for understanding and controlling p-wave superfluidity.

Contribution

We experimentally resolve the spin-dependent dipolar splitting in 6Li p-wave Feshbach resonances with high precision, demonstrating spin-reversal effects linked to electron spin and orbital angular momentum interactions.

Findings

Clear spin-dependent reversal in splitting observed

High-resolution measurement with sub-milligauss precision

Provides benchmarks for dipole-dipole interaction models

Abstract

The magnetic dipolar splitting of a p-wave Feshbach resonance is governed by the spin-orbital configuration of the valence electrons in the triplet molecular state. We perform high-resolution trap loss spectroscopy on ultracold 6Li atoms to resolve this splitting with sub-milligauss precision. By comparing spin-polarized (|mS| = 1) and spin-mixture (mS = 0) configurations of the triplet state, we observe a clear spin-dependent reversal in the splitting structure, confirmed via momentumresolved absorption imaging. This behavior directly reflects the interplay between electron spin projection mS and orbital angular momentum ml in the molecular states. Our results provide a stringent benchmark for dipole-dipole interaction models and lay the groundwork for controlling the pairing in p-wave superfluid systems.