Exact quasiparticle properties of a heavy polaron in BCS Fermi superfluids
arXiv:2202.05366 · doi:10.1103/PhysRevLett.128.175301
Abstract
We present the Ramsey response and radio-frequency spectroscopy of a heavy impurity immersed in an interacting Fermi superfluid, using exact functional determinant approach. We describe the Fermi superfluid through the conventional Bardeen-Cooper-Schrieffer theory and investigate the role of the pairing gap on quasiparticle properties revealed by the two spectroscopies. The energy cost for pair breaking prevents Anderson\textquoteright s orthogonality catastrophe that occurs in a non-interacting Fermi gas and allows the existence of polaron quasiparticles in the exactly solvable heavy impurity limit. Hence, we rigorously confirm the remarkable features such as dark continuum, molecule-hole continuum and repulsive polaron. For a magnetic impurity scattering at finite temperature, we predict additional resonances related to the sub-gap Yu-Shiba-Rusinov bound state, whose positions can be used to measure the superfluid pairing gap. For a non-magnetic scattering at zero temperature, we surprisingly find undamped repulsive polarons. These exact results might be readily observed in quantum gas experiments with Bose-Fermi mixtures that have a large-mass ratio.
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Cited by in corpus (18)
- Heavy polarons in ultracold atomic Fermi superfluids at the BEC-BCS crossover: formalism and applications
- Thermometry by correlated dephasing of impurities in a 1D Fermi gas
- Two-dimensional coherent spectroscopy of trion-polaritons and exciton-polaritons in atomically thin transition metal dichalcogenides
- Multidimensional Spectroscopy of Time-Dependent Impurities in Ultracold Fermions
- Thermally stable p-wave repulsive Fermi polaron without a two-body bound state
- Two-dimensional polaron spectroscopy of Fermi superfluids
- Theory of the spectral function of Fermi polarons at finite temperature
- Raman spectroscopy of Fermi polarons
- Fermi spin polaron and dissipative Fermi-polaron Rabi dynamics
- Exact calculation of spectral properties of a particle interacting with a one-dimensional Fermi gas in optical lattices
- Probing polaron clouds by Rydberg atom spectroscopy
- Tunable pairing with local spin-dependent Rydberg molecule potentials in an atomic Fermi superfluid
- Spectral function of Fermi polarons at finite temperature from a self-consistent many-body -matrix approach in real frequency
- Super Fermi polaron and Nagaoka ferromagnetism in a two-dimesnional square lattice
- Exact spectral properties of Fermi polarons in one-dimensional lattices: Anomalous Fermi singularities and polaron quasiparticles
- Microscopic many-body theory of two-dimensional coherent spectroscopy of excitons and trions in atomically thin transition metal dichalcogenides
- Correlated decoherence and thermometry with mobile impurities in a 1D Fermi gas
- Probing Bardeen-Cooper-Schrieffer pairing and quasiparticle formation in ultracold gases by Rydberg atom spectroscopy