arXiv:cond-mat/0209071 · Physical Review Letters

Tuning p -Wave Interactions in an Ultracold Fermi Gas of Atoms

Cindy A. Regal, Christopher Ticknor, John L. Bohn, D. S. Jin

Published Feb 5, 2003• 358 citations

Abstract

We have measured a p-wave Feshbach resonance in a single-component, ultracold Fermi gas of 40K atoms. We have used this resonance to enhance the normally suppressed p-wave collision cross section to values larger than the background s-wave cross section between 40K atoms in different spin states. In addition to the modification of two-body elastic processes, the resonance dramatically enhances three-body inelastic collisional loss.

DOI: 10.1103/physrevlett.90.053201

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arXiv:cond-mat/0209071 · Physical Review Letters

Tuning p -Wave Interactions in an Ultracold Fermi Gas of Atoms

Cindy A. Regal, Christopher Ticknor, John L. Bohn, D. S. Jin

Published Feb 5, 2003• 358 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physrevlett.90.053201

Related papers

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Physical Review AJul 18, 20250 citations

We study inelastic two-body relaxation in a spin-polarized ultracold Fermi gas in the presence of a

p

-wave Feshbach resonance. It is shown that in reduced dimensionalities, especially in the quasi-one-dimensional case, the enhancement of the inelastic rate constant on approach to the resonance is strongly suppressed compared to three dimensions. This may open promising paths for obtaining novel many-body states.

We theoretically investigate three-body losses in a single-component Fermi gas near a

p

-wave Feshbach resonance in the interacting, nonunitary regime. We extend the cascade model introduced by Waseem et al. [M. Waseem, J. Yoshida, T. Saito, and T. Mukaiyama, Phys. Rev. A 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 nonthermalized steady states, respectively. These findings are particularly relevant for understanding atom loss and the energetic evolution of ultracold gases of fermionic lithium atoms in their ground state.

We systematically studied the two-body loss in a two-component Fermi gas of

^{6}\mathrm{Li}

atoms near a

p

-wave Feshbach resonance. The two-body loss rate constants were measured for various temperatures and magnetic fields using atoms trapped in three-dimensional and quasi-two-dimensional traps. Our results were nicely reproduced by a theoretical model that incorporates the two-body loss as an imaginary part to the inverse of the scattering volume in the scattering amplitude expression. The observed loss suppression in quasi-two-dimensional traps may provide a promising strategy to realize a

p

-wave superfluid in a system of ultracold atoms.

{}^{6}{\text{Li-}}^{40}\text{K}

collision as an example, we demonstrate how this approach can be employed to control

s

- and

p

-wave inelastic loss processes and improve the suppression of the loss rate coefficient. This study may open a new possibility for the control of ultracold atomic inelastic collisions.