Spectra of heavy polarons and molecules coupled to a Fermi sea

Article

关键词: X-RAY-ABSORPTION;    SINGULARITIES;    EMISSION;    METALS;    SCATTERING;    PARTICLE;   

DOI  :  10.1103/PhysRevB.98.220302

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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