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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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Bibliographic Details
Main Authors: Li, Ruipeng (Author) , Milczewski, Jonas von (Author) , Imamoglu, Atac (Author) , Ołdziejewski, Rafał (Author) , Schmidt, Richard (Author)
Format: Article (Journal)
Language:English
Published: 21 April 2023
In: Physical review
Year: 2023, Volume: 107, Issue: 15, Pages: 1-19
ISSN:2469-9969
DOI:10.1103/PhysRevB.107.155135
Online Access: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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Author Notes:Ruipeng Li, Jonas von Milczewski, Atac Imamoglu, Rafał Ołdziejewski, and Richard Schmidt
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Summary: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.
Item Description:Gesehen am 12.06.2023
Physical Description:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.107.155135

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