Anomalous loss behavior in a single-component Fermi gas close to a $p$-Wave Feshbach resonance

TL;DR

This paper models three-body losses in a single-component Fermi gas near a p-wave Feshbach resonance, revealing anomalous density-dependent loss behaviors and energy evolution, crucial for ultracold fermionic lithium experiments.

Contribution

It extends the cascade model to include elastic and inelastic collisions, explaining anomalous loss behaviors and energy dynamics near p-wave Feshbach resonances.

Findings

Loss exhibits n^3 and anomalous n^2 density dependence.

Energy distribution shows collisional cooling or non-thermal steady states.

Results are relevant for ultracold lithium atom experiments.

Abstract

We theoretically investigate three-body losses in a single-component Fermi gas near a $p$-wave Feshbach resonance in the interacting, non-unitary regime. We extend the cascade model introduced by Waseem \textit{et al.} [M. Waseem, J. Yoshida, T. Saito, and T. Mukaiyama, Phys. Rev. A \textbf{99}, 052704 (2019)] to describe the elastic and inelastic collision processes. We find that the loss behavior exhibits a $n^3$ and an anomalous $n^2$ density dependence for a ratio of elastic-to-inelastic collision rate larger and smaller than 1, respectively. The corresponding evolutions of the energy distribution show collisional cooling or evolution toward low-energetic non-thermalized steady states, respectively. These findings are particularly relevant for understanding atom loss and energetic evolution of ultracold gases of fermionic lithium atoms in their ground state.