Measurement of $p$-wave contacts in an ultracold Fermi gas of $^6$Li atoms

TL;DR

This study measures $p$-wave contacts in an ultracold $^6$Li Fermi gas using RF spectroscopy, confirming theoretical predictions and providing new experimental data that enhance understanding of $p$-wave interactions.

Contribution

First measurement of $p$-wave contacts in $^6$Li gases near the Feshbach resonance, validating virial expansion theory and expanding experimental data beyond $^{40}$K systems.

Findings

RF spectrum shows $ ilde{ u}^{-1/2}$ and $ ilde{ u}^{-3/2}$ asymptotic behavior.

Magnetic-field dependence agrees with virial expansion theory.

Provides a second dataset for $p$-wave contacts in ultracold Fermi gases.

Abstract

Using radio-frequency (RF) spectroscopy, we measure the $p$-wave contacts in a Fermi gas of $^6$Li atoms near the $p$-wave Feshbach resonance. The RF spectrum exhibits clear asymptotic behavior, characterized by $\tilde{\omega}^{-1/2}$ and $\tilde{\omega}^{-3/2}$ dependencies. The magnetic-field dependence of the $p$-wave contacts agrees reasonably well with the virial expansion theory in a detuned magnetic field range, validating the theory near the Fermi temperature. The $p$-wave contacts measured in this study constitute a second dataset, complementing the data obtained from the $^{40}$K system and contributing valuable insights into $p$-wave interactions in ultracold Fermi gases.