Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:1708.00695 · Physical Review A

Two-body relaxation in a Fermi gas at a p -wave Feshbach resonance

Muhammad Waseem, Taketo Saito, Jun Yoshida, Takashi Mukaiyama

Published Dec 12, 2017• 34 citations
arXivHTMLPDF

Abstract

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.

DOI
10.1103/physreva.96.062704

Related papers

Collisional Loss of One-Dimensional Fermions Near a p -Wave Feshbach Resonance

Ya-Ting Chang, Ruwan Senaratne, Danyel Cavazos-Cavazos +1 more

We study collisional loss of a quasi-one-dimensional spin-polarized Fermi gas near a p-wave Feshbach resonance in ultracold ^{6}Li atoms. We measure the location of the p-wave resonance in quasi-1D and observe a confinement-induced shift and broadening. We find that the three-body loss coefficient L_{3} as a function of the quasi-1D confinement has little dependence on confinement strength. We also analyze the atom loss with a two-step cascade three-body loss model in which weakly bound dimers are formed prior to their loss arising from atom-dimer collisions. Our data are consistent with this model. We also find a possible suppression in the rate of dimer relaxation with strong quasi-1D confinement. We discuss the implications of these measurements for observing p-wave pairing in quasi-1D.

arXiv:2007.03723•Physical Review Letters•Dec 30, 2020•32 citations

Suppression of Three-Body Loss Near a p-Wave Resonance Due to Quasi-1D Confinement

Andrew Marcum, Francisco Fonta, Arif Mawardi Ismail +1 more

We investigate the three-body recombination rate of a Fermi gas of $^6$Li atoms confined in quasi-1D near a $p$-wave Feshbach resonance. We confirm that the quasi-1D loss rate constant $K_3$ follows the predicted threshold scaling law that $K_3$ is energy independent on resonance, and find consistency with the scaling law $K_3 \propto (k \, a_{1D})^6$ far from resonance [Mehta et al. Phys. Rev. A 76, 022711 (2007)]. Further we develop a theory based on Breit-Wigner analysis that describes the loss feature for intermediate fields. Lastly we measure how the loss rate constant scales with transverse confinement and find that $K_3 \propto V_L^{-1}$, where $V_L$ is the lattice depth. Importantly, at our attainable transverse confinements and temperatures, we see a 74-fold suppression of the on-resonant three-body loss rate constant in quasi-1D compared to 3D. With significant further enhancement of the transverse confinement, this suppression may pave the way for realizing stable $p$-wave superfluids.

arXiv:2007.15783•Jul 31, 2020•3 citations

Experimental determination of p -wave scattering parameters in ultracold 6 Li atoms

Takuya Nakasuji, Jun Yoshida, Takashi Mukaiyama

We report the experimental determination of the scattering parameters for a $p$-wave Feshbach resonance in a single-component Fermi gas of ${}^{6}$Li atoms in the lowest spin state. The time scale of the cross-dimensional relaxation reflects the elastic-scattering rate of the atoms, and scattering parameters are determined from the scattering rate as a function of magnetic field by taking into account the momentum distribution and inhomogeneous density profile of the atoms in a trap. Precise determination of the scattering parameters for a $p$-wave Feshbach resonance is an important step toward the realization of a $p$-wave superfluid in an ultracold atomic gas.

arXiv:1307.4493•Physical Review A•Jul 22, 2013•58 citations

Two-body relaxation of spin-polarized fermions in reduced dimensionalities near a p -wave Feshbach resonance

Denis V. Kurlov, Georgy V. Shlyapnikov

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.

arXiv:1612.04107•Physical Review A•Mar 31, 2017•26 citations

Three-body losses of a polarized Fermi gas near a p -wave Feshbach resonance in effective field theory

Marcel Schmidt, H.‐W. Hammer, Lucas Platter

We study three-body recombination of fully spin-polarized $^{6}\mathrm{Li}$ atoms that are interacting resonantly in relative $p$ waves. Motivated by a recent experiment, we focus on negative scattering volumes where three atoms recombine into a deep dimer and another atom. We calculate the three-body recombination rate using a Faddeev equation derived from effective field theory. In particular, we study the magnetic field and temperature dependences of the loss rate and use the recombination data to determine the effective range of the $p$-wave atom-atom interaction. We also predict the existence of a shallow three-body resonance state that manifests itself as a prominent feature in the energy-dependent three-body recombination rate.

arXiv:1911.05749•Physical Review A•Jun 1, 2020•24 citations

Scaling Law for Three-Body Collisions of Identical Fermions with p -Wave Interactions

Jun Yoshida, Taketo Saito, Muhammad Waseem +2 more

We experimentally confirmed the threshold behavior and scattering length scaling law of the three-body loss coefficients in an ultracold spin-polarized gas of ^{6}Li atoms near a p-wave Feshbach resonance. We measured the three-body loss coefficients as functions of temperature and scattering volume, and we found that the threshold law and the scattering length scaling law hold in limited temperature and magnetic field regions. We also found that the breakdown of the scaling laws is due to the emergence of the effective-range term. This work is an important first step towards a full understanding of the loss of identical fermions with p-wave interactions.

arXiv:1709.04160•Physical Review Letters•Mar 30, 2018•35 citations
We systematically studied the two-body loss in a two-component Fermi gas of 6Li^{6}\mathrm{Li}6Li atoms near a ppp-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 ppp-wave superfluid in a system of ultracold atoms.
We study collisional loss of a quasi-one-dimensional spin-polarized Fermi gas near a p-wave Feshbach resonance in ultracold ^{6}Li atoms. We measure the location of the p-wave resonance in quasi-1D and observe a confinement-induced shift and broadening. We find that the three-body loss coefficient L_{3} as a function of the quasi-1D confinement has little dependence on confinement strength. We also analyze the atom loss with a two-step cascade three-body loss model in which weakly bound dimers are formed prior to their loss arising from atom-dimer collisions. Our data are consistent with this model. We also find a possible suppression in the rate of dimer relaxation with strong quasi-1D confinement. We discuss the implications of these measurements for observing p-wave pairing in quasi-1D.
We investigate the three-body recombination rate of a Fermi gas of 6^66Li atoms confined in quasi-1D near a ppp-wave Feshbach resonance. We confirm that the quasi-1D loss rate constant K3K_3K3​ follows the predicted threshold scaling law that K3K_3K3​ is energy independent on resonance, and find consistency with the scaling law K3∝(k a1D)6K_3 \propto (k \, a_{1D})^6K3​∝(ka1D​)6 far from resonance [Mehta et al. Phys. Rev. A 76, 022711 (2007)]. Further we develop a theory based on Breit-Wigner analysis that describes the loss feature for intermediate fields. Lastly we measure how the loss rate constant scales with transverse confinement and find that K3∝VL−1K_3 \propto V_L^{-1}K3​∝VL−1​, where VLV_LVL​ is the lattice depth. Importantly, at our attainable transverse confinements and temperatures, we see a 74-fold suppression of the on-resonant three-body loss rate constant in quasi-1D compared to 3D. With significant further enhancement of the transverse confinement, this suppression may pave the way for realizing stable ppp-wave superfluids.
We report the experimental determination of the scattering parameters for a ppp-wave Feshbach resonance in a single-component Fermi gas of 6{}^{6}6Li atoms in the lowest spin state. The time scale of the cross-dimensional relaxation reflects the elastic-scattering rate of the atoms, and scattering parameters are determined from the scattering rate as a function of magnetic field by taking into account the momentum distribution and inhomogeneous density profile of the atoms in a trap. Precise determination of the scattering parameters for a ppp-wave Feshbach resonance is an important step toward the realization of a ppp-wave superfluid in an ultracold atomic gas.
We study inelastic two-body relaxation in a spin-polarized ultracold Fermi gas in the presence of a ppp-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 study three-body recombination of fully spin-polarized 6Li^{6}\mathrm{Li}6Li atoms that are interacting resonantly in relative ppp waves. Motivated by a recent experiment, we focus on negative scattering volumes where three atoms recombine into a deep dimer and another atom. We calculate the three-body recombination rate using a Faddeev equation derived from effective field theory. In particular, we study the magnetic field and temperature dependences of the loss rate and use the recombination data to determine the effective range of the ppp-wave atom-atom interaction. We also predict the existence of a shallow three-body resonance state that manifests itself as a prominent feature in the energy-dependent three-body recombination rate.
We experimentally confirmed the threshold behavior and scattering length scaling law of the three-body loss coefficients in an ultracold spin-polarized gas of ^{6}Li atoms near a p-wave Feshbach resonance. We measured the three-body loss coefficients as functions of temperature and scattering volume, and we found that the threshold law and the scattering length scaling law hold in limited temperature and magnetic field regions. We also found that the breakdown of the scaling laws is due to the emergence of the effective-range term. This work is an important first step towards a full understanding of the loss of identical fermions with p-wave interactions.