Repulsive polarons in two-dimensional Fermi gases

Abstract

We consider a single spin-down impurity atom interacting via an attractive, short-range potential with a spin-up Fermi sea in two dimensions (2D). Similarly to 3D, we show how the impurity can form a metastable state (the "repulsive polaron") with energy greater than that of the non-interacting impurity. Moreover, we find that the repulsive polaron can acquire a finite momentum for sufficiently weak attractive interactions. Even though the energy of the repulsive polaron can become sizeable, we argue that saturated ferromagnetism is unfavorable in 2D because of the polaron's finite lifetime and small quasiparticle weight.

6 pages, 3 figures

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Cited by in corpus (41)

• Fermi gases in one dimension: From Bethe Ansatz to experiments
• Attractive and repulsive Fermi polarons in two dimensions
• Polarons, Dressed Molecules, and Itinerant Ferromagnetism in ultracold Fermi gases
• Universal many-body response of heavy impurities coupled to a Fermi sea
• Quench Dynamics and Orthogonality Catastrophe of Bose Polarons
• Highly polarized Fermi gases in two dimensions
• Quantum flutter of supersonic particles in one-dimensional quantum liquids
• Observation of coherent multiorbital polarons in a two-dimensional Fermi gas
• Observation of a smooth polaron-molecule transition in a degenerate Fermi gas
• Magnetism in strongly interacting one-dimensional quantum mixtures
• Repulsive Fermi Polarons and Their Induced Interactions in Binary Mixtures of Ultracold Atoms
• Strong coupling Bose polarons in a two-dimensional gas
• Dynamics of an impurity in a one-dimensional lattice
• Dynamical variational approach to Bose polarons at finite temperatures
• Correlated quantum dynamics of two quenched fermionic impurities immersed in a Bose-Einstein Condensate
• High-precision numerical solution of the Fermi polaron problem and large-order behavior of its diagrammatic series
• Fermi polaron revisited: polaron-molecule transition and coexistence
• Three-body problem in a two-dimensional Fermi gas
• Radio frequency spectra of Feshbach molecules in quasi-two dimensional geometries
• High-polarization limit of the quasi-two-dimensional Fermi gas
• Many-body collisional dynamics of impurities injected into a double-well trapped Bose-Einstein condensate
• Dynamical formation of polarons in a Bose-Einstein condensate: A variational approach
• Quantum-Zeno Fermi polaron in the strong dissipation limit
• Nature of polaron-molecule transition in Fermi polarons
• Counterflow dynamics of two correlated impurities immersed in a bosonic gas
• Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature
• Two-dimensional repulsive Fermi polarons with short and long-range interactions
• Quantum Monte Carlo simulations of two-dimensional repulsive Fermi gases with population imbalance
• Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon
• Coupled Ferromagnetic and Nematic Ordering of Fermions in an Optical Flux Lattice
• Polaron in a $p+ip$ Fermi topological superfluid
• Exact Quantum Virial Expansion for the Optical Response of Doped Two-Dimensional Semiconductors
• Valley-mediated singlet- and triplet-polaron interactions and quantum dynamics in a doped WSe${}_2$ monolayer
• Highly polarized one-dimensional Fermi gases near a narrow $p-$wave resonance
• Finite-range effects in the two-dimensional repulsive Fermi polaron
• Spectra of heavy polarons and molecules coupled to a Fermi sea
• Momentum-dependent quasiparticle properties of the Fermi polaron from the functional renormalization group
• Mass-gap description of heavy impurities in Fermi gases
• Non-universal Fermi polaron in quasi two-dimensional quantum gases
• Multiple polaron quasiparticles with dipolar fermions in a bilayer geometry
• Phase Transitions of Repulsive Two-Component Fermi Gases in Two Dimensions