Impurity-induced pairing in two-dimensional Fermi gases
We study induced pairing between two identical fermions mediated by an attractively interacting quantum impurity in two-dimensional systems. Based on a stochastic variational method (SVM), we investigate the influence of confinement and finite interaction range effects on the mass ratio beyond which...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
21 April 2023
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| In: |
Physical review
Year: 2023, Jahrgang: 107, Heft: 15, Pages: 1-19 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.107.155135 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevB.107.155135 Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.107.155135 
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| Verfasserangaben: | Ruipeng Li, Jonas von Milczewski, Atac Imamoglu, Rafał Ołdziejewski, and Richard Schmidt |
| Zusammenfassung: | We study induced pairing between two identical fermions mediated by an attractively interacting quantum impurity in two-dimensional systems. Based on a stochastic variational method (SVM), we investigate the influence of confinement and finite interaction range effects on the mass ratio beyond which the ground state of the quantum three-body problem undergoes a transition from a composite bosonic trimer to an unbound dimer-fermion state. We find that confinement as well as a finite interaction range can greatly enhance trimer stability, bringing it within reach of experimental implementations such as found in ultracold atom systems. In the context of solid-state physics, our solution of the confined three-body problem shows that exciton-mediated interactions can become so dominant that they can even overcome detrimental Coulomb repulsion between electrons in atomically-thin semiconductors. Our paper thus paves the way towards a universal understanding of boson-induced pairing across various fermionic systems at finite density, and opens perspectives towards realizing unexplored forms of electron pairing beyond the conventional paradigm of Cooper pair formation. |
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| Beschreibung: | Gesehen am 12.06.2023 |
| Beschreibung: | Online Resource |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.107.155135 |