Thermal crossover, transition, and coexistence in Fermi polaronic spectroscopies
arXiv:1812.05889 · doi:10.1103/PhysRevA.99.063606
Abstract
We investigate thermal evolution of radio-frequency (RF) spectra of a spin-imbalanced Fermi gas near a Feshbach resonance in which degenerate Fermi-polaron and classical Boltzmann-gas regimes emerge in the low-temperature and high-temperature limits, respectively. By using a self-consistent framework of strong-coupling diagrammatic approaches, both of the ejection and reserve RF spectra available in cold-atom experiments are analyzed. We find a variety of transfers from Fermi polarons to Boltzmann gas such that a thermal crossover expected in the weak-coupling regime is shifted to a sharp transition near unitarity and to double-peak coexistence of attractive and repulsive branches in the strong-coupling regime. Our theory provides semiquantitative descriptions for a recent experiment on the ejection RF spectroscopy at unitarity [Z. Yan {\it et al}., arXiv:1811.00481v1] and demonstrate that the RF spectroscopy is an essential probe to examine effects of strong correlations and finite temperature.
Revised version, 5 pages and 5 figures
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Cited by in corpus (31)
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