Mobile impurity in a Fermi sea from the functional renormalization group analytically continued to real time

Kazuhiko Kamikado, Takuya Kanazawa, Shun Uchino

研究成果: Article査読

12 被引用数 (Scopus)

抄録

Motivated by experiments with cold atoms, we investigate a mobile impurity immersed in a Fermi sea in three dimensions at zero temperature by means of the functional renormalization group. We first perform the derivative expansion of the effective action to calculate the ground-state energy and Tan's contact across the polaron-molecule transition for several mass imbalances. Next we study quasiparticle properties of the impurity by using a real-time method recently developed in nuclear physics, which allows one to go beyond the derivative expansion. We obtain the spectral function of the polaron and the effective mass and quasiparticle weight of attractive and repulsive polarons, and clarify how they are affected by mass imbalances.

本文言語English
論文番号013612
ジャーナルPhysical Review A
95
1
DOI
出版ステータスPublished - 2017 1月 17
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学

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