Polarons in alkaline-earth-like atoms with multiple background Fermi surfaces
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We study the impurity problem in a Fermi gas of 173Yb atoms near an orbital Feshbach resonance (OFR), where a single moving particle in the 3P0 state interacts with two background Fermi seas of particles in different nuclear states of the ground 1S0 manifold. By employing wave function ansatz to molecule and polaron states, we investigate various properties of the molecule, the attractive polaron, and the repulsive polaron states. In comparison to the case where only one Fermi sea is populated, we find that the presence of an additional Fermi sea acts as an energy shift between the two channels of the OFR. In addition, quantum fluctuations near the Fermi level can also induce sizable effects to various properties of the attractive and repulsive polarons.
KeywordsFermi gas alkaline-earth atoms orbital Feshbach resonance polaron
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11434011, 11522436, 11704408, and 11774425), and the Research Funds of Renmin University of China (Grant No. 16XNLQ03). X. Z. acknowledges support from the National Postdoctoral Program for Innovative Talents (Grant No. BX201601908) and the China Postdoctoral Science Foundation (Grant No. 2017M620991).
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