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Scattering of two heavy Fermi polarons: resonances and quasibound states

Impurities in a Fermi sea, or Fermi polarons, experience a Casimir interaction induced by quantum fluctuations of the medium. When there is short-range attraction between impurities and fermions, also the induced interaction between two impurities is strongly attractive at short distance and oscilla...

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Hauptverfasser: Enss, Tilman (VerfasserIn) , Tran, Binh (VerfasserIn) , Rautenberg, Michael (VerfasserIn) , Gerken, Manuel (VerfasserIn) , Lippi, Eleonora (VerfasserIn) , Drescher, Moritz (VerfasserIn) , Zhu, Bing (VerfasserIn) , Weidemüller, Matthias (VerfasserIn) , Salmhofer, Manfred (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 17 December 2020
In: Physical review
Year: 2020, Jahrgang: 102, Heft: 6, Pages: 1-7
ISSN:2469-9934
DOI:10.1103/PhysRevA.102.063321
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevA.102.063321
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.102.063321
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Verfasserangaben:Tilman Enss, Binh Tran, Michael Rautenberg, Manuel Gerken, Eleonora Lippi, Moritz Drescher, Bing Zhu, Matthias Weidemüller, and Manfred Salmhofer
Beschreibung
Zusammenfassung:Impurities in a Fermi sea, or Fermi polarons, experience a Casimir interaction induced by quantum fluctuations of the medium. When there is short-range attraction between impurities and fermions, also the induced interaction between two impurities is strongly attractive at short distance and oscillates in space for larger distances. We theoretically investigate the scattering properties and compute the scattering phase shifts and scattering lengths between two heavy impurities in an ideal Fermi gas at zero temperature. While the induced interaction between impurities is weakly attractive for weak impurity-medium interactions, we find that impurities strongly and attractively interacting with the medium exhibit resonances in the induced scattering with a sign change of the induced scattering length and even strong repulsion. These resonances occur whenever a three-body Efimov bound state appears at the continuum threshold. At energies above the continuum threshold, we find that the Efimov state in medium can turn into a quasibound state with a finite decay width.
Beschreibung:Gesehen am 14.10.2021
Beschreibung:Online Resource
ISSN:2469-9934
DOI:10.1103/PhysRevA.102.063321

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