Observation of coherent multiorbital polarons in a two-dimensional Fermi gas

Abstract

We report on the experimental observation of multiorbital polarons in a two-dimensional Fermi gas of ${}^{173}\mathrm{Yb}$ atoms formed by mobile impurities in the metastable ${}^3{\mathrm{P}}_0$ orbital and a Fermi sea in the ground-state ${}^1{\mathrm{S}}_0$ orbital. We spectroscopically probe the energies of attractive and repulsive polarons close to an orbital Feshbach resonance and characterize their coherence by measuring the quasiparticle residue. For all probed interaction parameters, the repulsive polaron is a long-lived quasiparticle with a decay rate more than 2 orders of magnitude below its energy. We formulate a many-body theory, which accurately treats the interorbital interactions in two dimensions and agrees well with the experimental results. Our work paves the way for the investigation of many-body physics in multiorbital ultracold Fermi gases.

6 pages, 4 figures; Supplementary Material

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Cited by in corpus (7)

• Electron-exciton interactions in the exciton-polaron problem
• Fate of the Bose polaron at finite temperature
• Polaron Problems in Ultracold Atoms: Role of a Fermi Sea across Different Spatial Dimensions and Quantum Fluctuations of a Bose Medium
• High-precision numerical solution of the Fermi polaron problem and large-order behavior of its diagrammatic series
• Thermodynamic signatures of the polaron-molecule transition in a Fermi gas
• Interorbital Interactions in an SU(2)xSU(6)-Symmetric Fermi-Fermi Mixture
• Few-body solutions under spin-exchange interaction: magnetic bound state and the Kondo screening effect