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

Autor: Daichi Kagamihara, Daisuke Inotani, Koki Manabe, Yoji Ohashi
Rok vydání: 2018
Předmět:
Zdroj: Journal of Low Temperature Physics. 196:126-132
ISSN: 1573-7357
0022-2291
DOI: 10.1007/s10909-018-02114-1
Popis: We extend some of the authors’ previous work for a mass-balanced Bose–Fermi mixture to include effects of realistic mass imbalance in a $$^{23}$$ Na– $$^{40}$$ K and a $$^{87}$$ Rb– $$^{40}$$ K 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 $$T_{\mathrm {BEC}}$$ . 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 $$^{23}$$ Na– $$^{40}$$ K, as well as $$^{87}$$ Rb– $$^{40}$$ K, 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.
Databáze: OpenAIRE
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