Polarons and Molecules in a Fermi Gas with Orbital Feshbach Resonance

Abstract

We study the impurity problem in a gas of ${}^{173}$Yb atoms near the recently discovered orbital Feshbach resonance. In an orbital Feshbach resonance, atoms in the electronic ground state ${}^1{S}_0$ interact with those in the long-lived excited ${}^3{P}_0$ state with magnetically tunable interactions. We consider an impurity atom with a given hyperfine spin in the ${}^3{P}_0$ state interacting with a single-component Fermi sea of atoms in the ground ${}^1{S}_0$ manifold. Close to the orbital Feshbach resonance, the impurity can induce collective particle-hole excitations out of the Fermi sea, which can be regarded as the polaron state. While as tuning toward the BEC regime of the resonance, a molecular state becomes the ground state of the system. We show that a polaron to molecule transition exists in ${}^{173}$Yb atoms close to the orbital Feshbach resonance. Furthermore, due to the spin-exchange nature of the orbital Feshbach resonance, the formation of both the polaron and the molecule involve spin-flipping processes with interesting density distributions among the relevant hyperfine spin states. We show that the polaron to molecule transition can be detected using Raman spectroscopy.

8 pages, 6 figures

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Cited by in corpus (4)

• Observation of coherent multiorbital polarons in a two-dimensional Fermi gas
• Nature of polaron-molecule transition in Fermi polarons
• Emergence of Crystalline Few-body Correlations in Mass-imbalanced Fermi Polarons
• Competing few-body correlations in ultracold Fermi polarons