Spectra of heavy polarons and molecules coupled to a Fermi sea

Dimitri Pimenov, Moshe Goldstein

Research output: Contribution to journalArticlepeer-review


We study the spectrum of an impurity coupled to a Fermi sea (e.g., minority atom in an ultracold gas, exciton in a solid) by attraction strong enough to form a molecule/trion. We introduce a diagrammatic scheme which allows treating a finite mass impurity while reproducing the Fermi-edge singularity in the immobile limit. For large binding energies the spectrum is characterized by a semicoherent repulsive polaron and an incoherent molecule-hole continuum, which is the lowest-energy feature in the single-particle spectrum. The previously predicted attractive polaron seems not to exist for strong binding.

Original languageEnglish
Article number220302
JournalPhysical Review B
Issue number22
StatePublished - 12 Dec 2018


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