Impurity-induced pairing in two-dimensional Fermi gases
arXiv:2211.12495 · doi:10.1103/PhysRevB.107.155135
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.
21 pages, 15 figures
References in corpus (24)
- Many-Body Physics with Ultracold Gases
- Theory of ultracold Fermi gases
- Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
- Cold molecules: Progress in Quantum Engineering of Chemistry and Quantum Matter
- Attractive and repulsive Fermi polarons in two dimensions
- Dipolar physics: A review of experiments with magnetic quantum gases
- Unconventional Superconductivity
- Signatures of bilayer Wigner crystals in a transition metal dichalcogenide heterostructure
- Observation of Wigner crystal of electrons in a monolayer semiconductor
- New frontiers with quantum gases of polar molecules
- Quantum Gases in Optical Boxes
- Low-energy three-body dynamics in binary quantum gases
- Transition from a polaronic condensate to a degenerate Fermi gas of heteronuclear molecules
- Observation of Cooper Pairs in a Mesoscopic 2D Fermi Gas
- Optical signatures of charge order in a Mott-Wigner state
- Chiral Topological Superconductors Enhanced by Long-Range Interactions
- Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture
- Five-Body Efimov Effect and Universal Pentamer in Fermionic Mixtures
- Charge- superconductivity from nematic superconductors in 2D and 3D
- Bound states in a quasi-two-dimensional Fermi gas
- Optical sensing of fractional quantum Hall effect in graphene
- Simulations of Trions and Biexcitons in Layered Hybrid Organic-Inorganic Lead Halide Perovskites
- Universal tetramer and pentamer in two-dimensional fermionic mixtures
- Excited-State Trions in Two Dimensional Materials