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

References in corpus (14)

• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Normal state of a polarized Fermi gas at unitarity
• BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
• Normal state of highly polarized Fermi gases: Full many-body treatment
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Theory of RF-spectroscopy of strongly interacting Fermions
• Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas
• Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
• Determination of the Equation of State of a Two-Component Fermi Gas at Unitarity
• Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas
• Fermi surfaces and Luttinger's theorem in paired fermion systems

Cited by in corpus (73)

• Attractive and repulsive Fermi polarons in two dimensions
• The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Homogeneous Atomic Fermi Gases
• Time dependent impurity in ultracold fermions: orthogonality catastrophe and beyond
• Ultra-cold Polarized Fermi Gases
• Excitation spectra and rf-response near the polaron-to-molecule transition from the functional renormalization group
• Variational study of polarons in Bose-Einstein condensates
• Superfluidity of Interacting Bosonic Mixtures in Optical Lattices
• Trimers, molecules and polarons in imbalanced atomic Fermi gases
• Breakdown of Fermi liquid description for strongly interacting fermions
• Polaron-molecule transitions in a two-dimensional Fermi gas
• Highly polarized Fermi gases in two dimensions
• Ground state of a tightly bound composite dimer immersed in a Fermi Sea
• Spectral response and contact of the unitary Fermi gas
• Numerical analytic continuation: Answers to well-posed questions
• Spin-Imbalanced Quasi-Two-Dimensional Fermi Gases
• Coherent Interaction of a Single Fermion with a Small Bosonic Field
• Polarons and Molecules in a Two-Dimensional 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
• Polaronic atom-trimer continuity in three-component Fermi gases
• Quantum Breathing of an Impurity in a One-dimensional Bath of Interacting Bosons
• Finite-temperature behavior of the Bose polaron
• The normal phase of an imbalanced Fermi gas
• Polaronic slowing of fermionic impurities in lattice Bose-Fermi mixtures
• Quantum Brownian Motion with Inhomogeneous Damping and Diffusion
• From non equilibrium quantum Brownian motion to impurity dynamics in 1D quantum liquids
• Bloch oscillations of bosonic lattice polarons
• Observation of interspecies Feshbach resonances in an ultracold ${}^{39}$K-${}^{133}$Cs mixture and refinement of interaction potentials
• Molecule and polaron in a highly polarized two-dimensional Fermi gas with spin-orbit coupling
• Diagrammatic Monte Carlo study of mass-imbalanced Fermi-polaron system
• Bound states of a localized magnetic impurity in a superfluid of paired ultracold fermions
• Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances
• Generalized Hartree-Fock-Bogoliubov Description of the Frohlich Polaron
• Production of large ${}^{41}$K Bose-Einstein condensates using D1 gray molasses
• Universality of the unitary Fermi gas: A few-body perspective
• Condensed phase of Bose-Fermi mixtures with a pairing interaction
• Enhancing the Efimov correlation in Bose polarons with large mass imbalance
• Three-component Ultracold Fermi Gases with Spin-Orbit Coupling
• Polarons and Molecules in a Fermi Gas with Orbital Feshbach Resonance
• Effective-range dependence of resonant Fermi gases
• Dynamic response of strongly correlated Fermi gases in the quantum virial expansion
• Bogoliubov-de Gennes study of trapped spin-imbalanced unitary Fermi gases
• Pairing and radio-frequency spectroscopy in two-dimensional Fermi gases
• Magnetism and quantum phase transitions in spin-1/2 attractive fermions with polarization
• Sigature of the universal super Efimov Effect: three-body contact in two dimensional Fermi gases
• Anomalous Dimers in Quantum Mixtures near Broad Resonances: Pauli Blocking, Fermi Surface Dynamics and Implications
• Hartree-Fock treatment of Fermi polarons using the Lee-Low-Pine transformation
• Self-localization of a small number of Bose particles in a superfluid Fermi system
• Induced p-wave superfluidity in strongly interacting imbalanced Fermi gases
• Bipolarons bound by repulsive phonon-mediated interactions
• Many-body effects of a two-dimensional electron gas on trion-polaritons
• Probing the dynamic structure factor of a neutral Fermi superfluid along the BCS-BEC crossover using atomic impurity qubits
• Momentum-resolved radio-frequency spectroscopy of a spin-orbit coupled atomic Fermi gas near a Feshbach resonance in harmonic traps
• Universal trimers emerging from a spin-orbit coupled Fermi sea
• Polaron-like effects in a one-dimensional optical lattice
• Kondo effect and the fate of bistability in molecular quantum dots with strong electron-phonon coupling
• Dynamical crossover between the infinite-volume and empty-lattice limits of ultra-cold fermions in 1D optical lattices
• Single particle polariton properties in doped quantum well microcavities: role of the Fermi edge singularity and Anderson orthogonality catastrophe
• Angular self-localization of impurities rotating in a bosonic bath
• Three in Many: Efimov physics in the presence of a Fermi sea
• Semiclassical polaron dynamics of impurities in ultracold gases
• Exact results for polaron and molecule in one-dimensional spin-1/2 Fermi gas
• Mobile magnetic impurities in a Fermi superfluid: a route to designer molecules
• A mixed dimensional Bose polaron
• Periodically-driven Kondo impurity in nonequilibrium steady states
• Mobile Impurities and Orthogonality Catastrophe in two-dimensional Vortex Lattices
• Magnetic Impurities in Two-Dimensional Superfluid Fermi Gas with Spin-Orbit Coupling
• A Composite Fermion Approach to the Ultracold Dilute Fermi Gas
• Tunable nanomagnetism in moderately cold fermions on optical lattices