Thermal crossover, transition, and coexistence in Fermi polaronic spectroscopies

Hiroyuki Tajima, Shun Uchino

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigate the 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 self-consistent frameworks of strong-coupling diagrammatic approaches, both the ejection and the reserve RF spectra available in cold-atom experiments are analyzed. We find a variety of transfers from Fermi polarons to the 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, P. B. Patel, B. Mukherjee, R. J. Fletcher, J. Struck, and M. W. Zwierlein, Phys. Rev. Lett. 122, 093401 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.093401] and suggests the importance of beyond-two-body correlations in the high-temperature regime due to the absence of Pauli-blocking effects.

Original languageEnglish
Article number063606
JournalPhysical Review A
Volume99
Issue number6
DOIs
Publication statusPublished - 2019 Jun 12

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crossovers
radio frequencies
ejection
gases
spectroscopy
polarons
atoms

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Thermal crossover, transition, and coexistence in Fermi polaronic spectroscopies. / Tajima, Hiroyuki; Uchino, Shun.

In: Physical Review A, Vol. 99, No. 6, 063606, 12.06.2019.

Research output: Contribution to journalArticle

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