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

Kazuhiko Kamikado, Takuya Kanazawa, Shun Uchino

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number013612
JournalPhysical Review A
Volume95
Issue number1
DOIs
Publication statusPublished - 2017 Jan 17
Externally publishedYes

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impurities
expansion
polarons
nuclear physics
ground state
atoms
molecules
temperature
energy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Mobile impurity in a Fermi sea from the functional renormalization group analytically continued to real time. / Kamikado, Kazuhiko; Kanazawa, Takuya; Uchino, Shun.

In: Physical Review A, Vol. 95, No. 1, 013612, 17.01.2017.

Research output: Contribution to journalArticle

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