Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms

Abstract

We have observed Fermi polarons, dressed spin down impurities in a spin up Fermi sea of ultracold atoms. The polaron manifests itself as a narrow peak in the impurities' rf spectrum that emerges from a broad incoherent background. We determine the polaron energy and the quasiparticle residue for various interaction strengths around a Feshbach resonance. At a critical interaction, we observe the transition from polaronic to molecular binding. Here, the imbalanced Fermi liquid undergoes a phase transition into a Bose liquid coexisting with a Fermi sea.

8 pages, 5 figures (includes Supplemental Information) Review Article in Physics: http://physics.aps.org/articles/v2/48

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Cited by in corpus (265)

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• Variational study of polarons in Bose-Einstein condensates
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• Non-equilibrium quantum dynamics and formation of the Bose polaron
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• Highly polarized Fermi gases in two dimensions
• Ground state of a tightly bound composite dimer immersed in a Fermi Sea
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• Few-body Bose gases in low dimensions -- a laboratory for quantum dynamics
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• Coherent Interaction of a Single Fermion with a Small Bosonic Field
• Observation of coherent multiorbital polarons in a two-dimensional Fermi gas
• Polarons and Molecules in a Two-Dimensional Fermi Gas
• Observation of a smooth polaron-molecule transition in a degenerate Fermi gas
• Observation of a Degenerate Fermi Gas Trapped by a Bose-Einstein Condensate
• Quantum Monte-Carlo study of the Bose polaron problem in a one-dimensional gas with contact interactions
• Polarons in Ultracold Fermi Superfluids
• Decay of polarons and molecules in a strongly polarized Fermi gas
• Mediated interactions between Fermi polarons and the role of impurity quantum statistics
• Mobile impurity in a Bose-Einstein condensate and the orthogonality catastrophe
• Polaronic atom-trimer continuity in three-component Fermi gases
• Exciton-polaron interactions in monolayer WS${}_2$
• Polaron Interactions and Bipolarons in One-Dimensional Bose Gases in the Strong Coupling Regime
• Quasiparticle lifetime of the repulsive Fermi polaron
• Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture
• Universal aspects of a strongly interacting impurity in a dilute Bose condensate
• Quantum Breathing of an Impurity in a One-dimensional Bath of Interacting Bosons
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• Fate of the Bose polaron at finite temperature
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• The normal phase of an imbalanced Fermi gas
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• Bath-Induced Correlations Enhance Thermometry Precision at Low Temperatures
• Mixed bubbles in Bose-Bose mixtures
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• Diagrammatic Monte Carlo study of mass-imbalanced Fermi-polaron system
• Polaron Problems in Ultracold Atoms: Role of a Fermi Sea across Different Spatial Dimensions and Quantum Fluctuations of a Bose Medium
• Bound states of a localized magnetic impurity in a superfluid of paired ultracold fermions
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• Universality of the unitary Fermi gas: A few-body perspective
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• Overlapping Bose-Einstein Condensates of ${}^{23}$Na and ${}^{133}$Cs
• Scattering of two heavy Fermi polarons: resonances and quasibound states
• Condensed phase of Bose-Fermi mixtures with a pairing interaction
• Lattice polarons across the superfluid to Mott insulator transition
• Mediated interactions between ions in quantum degenerate gases
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• Pump Probe Spectroscopy of Bose Polarons: Dynamical Formation and Coherence
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• Pattern formation in one-dimensional polaron systems and temporal orthogonality catastrophe
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• Bipolarons bound by repulsive phonon-mediated interactions
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• Counterflow dynamics of two correlated impurities immersed in a bosonic gas
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• Probing the dynamic structure factor of a neutral Fermi superfluid along the BCS-BEC crossover using atomic impurity qubits
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• Impurities in quasi-one-dimensional droplets of binary Bose mixtures
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• Exact results for polaron and molecule in one-dimensional spin-1/2 Fermi gas
• Semiclassical polaron dynamics of impurities in ultracold gases
• Controlling the interactions in a cold atom quantum impurity system
• The ground state of polaron in an ultracold dipolar Fermi gas
• Synthetic superfluid chemistry with vortex-trapped quantum impurities
• Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
• Tayloring Bose-Einstein condensate environments for a Rydberg impurity
• Experimental setup for studying an ultracold mixture of trapped Yb${}^{+}$-${}^6$Li
• An impurity immersed in a double Fermi Sea
• Polaritons in an electron gas -- quasiparticles and Landau effective interactions
• Multidimensional Spectroscopy of Time-Dependent Impurities in Ultracold Fermions
• Fermi polaron in low-density spin-polarized neutron matter
• A mobile ion in a Fermi sea
• Chiral polaron formation on the edge of topological quantum matter
• Rabi oscillations and magnetization of a mobile spin-1/2 impurity in a Fermi sea
• Analytical approach to the Bose polaron \\ via $q$-deformed Lie algebra
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• Engineering impurity Bell states through coupling with a quantum bath
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• Mobile impurity in a one-dimensional gas at finite temperatures
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• Mobile impurity probing a two-dimensional superfluid phase transition
• Thermally stable p-wave repulsive Fermi polaron without a two-body bound state
• A mixed dimensional Bose polaron
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• Dissipative dynamics of an impurity with spin-orbit coupling
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• Local spectral density of an interacting one-dimensional Bose gas with an impurity
• Bose polaron in spherically symmetric trap potentials: Ground states with zero and lower angular momenta
• Optical conductivity of an anharmonic large polaron gas at weak coupling
• Dissipation-relaxation dynamics of a spin-1/2 particle with a Rashba-type spin-orbit coupling in an ohmic heat bath
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• Fermions meet two bosons -- the heteronuclear Efimov effect revisited
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• Decoherence and momentum relaxation in Fermi-polaron Rabi dynamics: a kinetic equation approach
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• Exploring ${}^3{P}_0$ Superfluid in Dilute Spin-Polarized Neutron Matter
• A unified theory of strong coupling Bose polarons: From repulsive polarons to non-Gaussian many-body bound states
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• Repulsive Fermi and Bose Polarons in Quantum Gases
• An efficient high-current circuit for fast radio-frequency spectroscopy in cold atomic gases
• Spectral function of Fermi polarons at finite temperature from a self-consistent many-body $T$-matrix approach in real frequency
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• Anisotropic potential immersed in a dipolar Bose-Einstein condensate
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• Magnetic monopole induced polarons in atomic superlattices
• Force on a moving object in an ideal quantum gas
• The normal state of attractive Fermi gases from coupled-cluster theory
• Breathing dynamics of the Bose polaron in a species-selective harmonic trap
• Bound states in two-dimensional Fermi systems with quadratic band touching
• Effective two- and three-body interactions between dressed impurities in a tilted double-well potential
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• Phenomenological model of decaying Bose polarons
• Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy
• Bose Polaron in a quantum fluid of light
• Complex-valued in-medium potential between heavy impurities in ultracold atoms
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• Mobile impurity interacting with a Hubbard chain and the role of Friedel oscillations
• Quantum Computing Demonstration of the Polaron-Molecule Transition on a NISQ Device
• Ab initio study of the neutron and Fermi polarons on the lattice
• Effective Polaron Dynamics of an Impurity Particle Interacting with a Fermi Gas
• Tunable nanomagnetism in moderately cold fermions on optical lattices
• Signatures of the orthogonality catastrophe in a coherently driven impurity