Low-field Feshbach resonances and three-body losses in a fermionic quantum gas of $^{161}$Dy

TL;DR

This study provides detailed high-resolution Feshbach spectroscopy of a fermionic $^{161}$Dy quantum gas, revealing multiple resonances and loss suppression phenomena crucial for future quantum gas research.

Contribution

It presents the first detailed characterization of low-field Feshbach resonances and three-body loss behavior in fermionic $^{161}$Dy, including loss suppression at low temperatures.

Findings

Up to 44 Feshbach resonances identified up to 1 G

Observation of loss suppression at low temperatures

Dependence of three-body loss on magnetic detuning and temperature

Abstract

We report on high-resolution Feshbach spectroscopy on a degenerate, spin-polarized Fermi gas of $^{161}$Dy atoms, measuring three-body recombination losses at low magnetic field. For field strength up to 1\,G, we identify as much as 44 resonance features and observe plateaus of very low losses. For four selected typical resonances, we study the dependence of the three-body recombination rate coefficient on the magnetic resonance detuning and on the temperature. We observe a strong suppression of losses with decreasing temperature already for small detunings from resonance. The characterization of complex behavior of three-body losses of fermionic $^{161}$Dy is important for future applications of this peculiar species in research on atomic quantum gases.