Single-Particle Structures in the Normal State of a Strongly Interacting Bose–Fermi Mixture with Mass Imbalance

K. Manabe, D. Kagamihara, D. Inotani, Y. Ohashi

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1 Citation (Scopus)


We extend some of the authors’ previous work for a mass-balanced Bose–Fermi mixture to include effects of realistic mass imbalance in a 23Na–40K and a 87Rb–40K mixtures. Including effects of pairing fluctuations within the framework of an improved T-matrix theory, we calculate the single-particle spectral weight (SW), as well as the photoemission spectrum (PES) in the unitary regime at the Bose–Einstein condensation temperature TBEC. We show that the characteristic three-peak structure induced by paring fluctuations, being predicted in the mass-balanced case, remains to exist in SW even in the presence of mass difference. We also show that PES is a useful experimental method to observe this phenomenon in a 23Na–40K, as well as 87Rb–40K, Bose–Fermi mixtures. Since this strong-coupling phenomenon is qualitatively different from that in a two-component Fermi gas, our results would be useful in clarifying how the quantum statistics affects Bose and Fermi pairing phenomena in a two-component gas mixture.

Original languageEnglish
Pages (from-to)126-132
Number of pages7
JournalJournal of Low Temperature Physics
Issue number1-2
Publication statusPublished - 2019 Jul 15


  • Bose–Einstein condensation
  • Bose–Fermi mixture
  • Cold atom physics
  • Strong-coupling effects

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics


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