Feshbach Resonances inp-Wave Three-Body Recombination within Fermi-Fermi Mixtures of Open-ShellLi6and Closed-ShellYb173Atoms,Physical Review X

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Feshbach Resonances inp-Wave Three-Body Recombination within Fermi-Fermi Mixtures of Open-ShellLi6and Closed-ShellYb173Atoms
Physical Review X ( IF 11.6 ) Pub Date : 2020-08-14 , DOI: 10.1103/physrevx.10.031037
Alaina Green ₁ , Hui Li ₂ , Jun Hui See Toh ₁ , Xinxin Tang ₁ , Katherine C McCormick ₁ , Ming Li ₂ , Eite Tiesinga ₃ , Svetlana Kotochigova ₂ , Subhadeep Gupta ₁

Affiliation

We report on the observation of magnetic Feshbach resonances in a Fermi-Fermi mixture of ultracold atoms with extreme mass imbalance and on their unique

p

-wave dominated three-body recombination processes. Our system consists of open-shell alkali-metal

{}^{6}{Li}

and closed-shell

{}^{173}{Yb}

atoms, both spin polarized and held at various temperatures between 1 and

20 μ K

. We confirm that Feshbach resonances in this system are solely the result of a weak separation-dependent hyperfine coupling between the electronic spin of

{}^{6}{Li}

and the nuclear spin of

{}^{173}{Yb}

. Our analysis also shows that three-body recombination rates are controlled by the identical fermion nature of the mixture, even in the presence of

s

-wave collisions between the two species and with recombination rate coefficients outside the Wigner threshold regime at our lowest temperature. Specifically, a comparison of experimental and theoretical line shapes of the recombination process indicates that the characteristic asymmetric line shape as a function of applied magnetic field and a maximum recombination rate coefficient that is independent of temperature can only be explained by triatomic collisions with nonzero,

p

-wave total orbital angular momentum. The resonances can be used to form ultracold doublet ground-state molecules and to simulate quantum superfluidity in mass-imbalanced mixtures.

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