Polaron-to-molecule transition in a strongly imbalanced Fermi gas

M. Punk, P. T. Dumitrescu, W. Zwerger

Research output: Contribution to journalArticlepeer-review

151 Scopus citations

Abstract

A single down-spin fermion with an attractive zero-range interaction with a Fermi sea of up-spin fermions forms a polaronic quasiparticle. The associated quasiparticle weight vanishes beyond a critical strength of the attractive interaction, where a many-body bound state is formed. From a variational wave function in the molecular limit, we determine the critical value for the polaron-to-molecule transition. The value agrees well with the diagrammatic Monte Carlo results of Prokof'ev and Svistunov and is consistent with recent rf-spectroscopy measurements of the quasiparticle weight by Schirotzek. In addition, we calculate the contact coefficient of the strongly imbalanced gas, using the adiabatic theorem of Tan and discuss the implications of the polaron-to-molecule transition for the phase diagram of the attractive Fermi gas at finite imbalance.

Original languageEnglish
Article number053605
JournalPhysical Review A
Volume80
Issue number5
DOIs
StatePublished - 6 Nov 2009

Fingerprint

Dive into the research topics of 'Polaron-to-molecule transition in a strongly imbalanced Fermi gas'. Together they form a unique fingerprint.

Cite this