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Impurity-induced pairing in two-dimensional Fermi gases

MPS-Authors

Li ,  Ruipeng
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;
MCQST - Munich Center for Quantum Science and Technology, External Organizations;

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Milczewski,  Jonas von
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;
MCQST - Munich Center for Quantum Science and Technology, External Organizations;
IMPRS (International Max Planck Research School), Max Planck Institute of Quantum Optics, Max Planck Society;

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Ołdziejewski,  Rafał
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;
MCQST - Munich Center for Quantum Science and Technology, External Organizations;

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Schmidt,  Richard
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;

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2211.12495.pdf
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6425.pdf
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Citation

Li, R., Milczewski, J. v., Imamoglu, A., Ołdziejewski, R., & Schmidt, R. (2023). Impurity-induced pairing in two-dimensional Fermi gases. Physical Review B, 107: 155135. doi:10.1103/PhysRevB.107.155135.


Cite as: https://hdl.handle.net/21.11116/0000-000B-EF4B-5
Abstract
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 work
thus paves the way towards a universal understanding of boson-induced pairing
across various fermionic systems at finite density, and opens perspectives
towards realizing novel forms of electron pairing beyond the conventional
paradigm of Cooper pair formation.