Vortices and Superfluidity in a Strongly Interacting Fermi Gas

Abstract

Quantum-degenerate Fermi gases provide a remarkable opportunity to study strongly interacting fermions. In contrast to other Fermi systems, such as superconductors, neutron stars or the quark-gluon plasma, these gases have low densities and their interactions can be precisely controlled over an enormous range. Here we report observations of vortices in such a gas that provide definitive evidence for superfluidity. By varying the pairing strength between two fermions near a Feshbach resonance, one can explore the crossover from a Bose-Einstein condensate (BEC) of molecules to a Bardeen-Cooper-Schrieffer (BCS) superfluid of loosely bound pairs whose size is comparable to, or even larger than, the interparticle spacing. The crossover realizes a novel form of high-T_C superfluidity and it may provide new insight for high-T_C superconductors. Previous experiments with Fermi gases have revealed condensation of fermion pairs. While these and other studies were consistent with predictions assuming superfluidity, the smoking gun for superfluid behavior has been elusive. Our observation of vortex lattices directly displays superfluid flow in a strongly interacting, rotating Fermi gas.

14 pages, including 7 figures, submitted to Nature

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• Fermions at unitarity and Haldane Exclusion Statistics
• Finite-momentum superfluidity and phase transitions in a p-wave resonant Bose gas
• Magneto-optical Feshbach resonance: Controlling cold collision with quantum interference
• Fermi edge singularity in neutral electron-hole system
• Two-band description of resonant superfluidity in atomic Fermi gases
• Phase Separation in Bose-Fermi-Fermi Mixtures as a Probe of Fermi Superfluidity
• Vortex Lattices in the Bose-Fermi Superfluid Mixture
• Observability of Higgs Mode in a system without Lorentz invariance
• Surface Energy in Cold Asymmetrical Fermion Superfluids
• Dressed-molecules in resonantly-interacting ultracold atomic Fermi gases
• Vortex generation in stirred binary Bose-Einstein condensates
• Universal Properties of Fermi Gases in One-dimension
• Topologically trapped vortex molecules in Bose-Einstein condensates
• Optically trapped Feshbach molecules of fermionic 161Dy and 40K
• Unitary polarized Fermi gas under adiabatic rotation
• Ginzburg-Landau theory of a trapped Fermi gas with a BEC-BCS crossover
• Thouless-Valatin Rotational Moment of Inertia from the Linear Response Theory
• Three component fermion pairing in two dimensions
• Stability of superfluid phases in the 2D Spin-Polarized Attractive Hubbard Model
• Sound propagation in a two-dimensional Bose gas across the superfluid transition
• Trap-imbalanced fermion mixtures
• Relaxation dynamics of an isolated large-spin Fermi gas far from equilibrium
• Phase operators and blurring time of a pair-condensed Fermi gas
• Multiple phase separation in one-dimensional mixtures of mass- and population-imbalanced attractive Fermi gases
• Quantum Coherent States of Interacting Bose-Fermi Mixtures in One Dimension
• Stripe Formation in Fermionic Atoms on 2-D Optical Lattice inside a Box Trap: DMRG Studies for Repulsive Hubbard Model with Open Boundary Condition
• Kohn-Sham theory of rotating dipolar Fermi gas in two dimensions
• Quantum oscillations in ultracold Fermi gases : realizations with rotating gases or artificial gauge fields
• Bound States and Superconductivity in Dense Fermi Systems
• Bell Soliton in Ultra-cold Atomic Fermi Gas
• Vortex line in the unitary Fermi gas
• Finite temperature vortices in a rotating Fermi gas
• Phases of Bosons or Fermions in confined optical lattices
• BCS-BEC quantum phase transition and collective excitations in two-dimensional Fermi gases with p- and d-wave pairings
• A new many-body wave function for BCS-BEC crossover in Fermi gases
• Effect of Quadratic Zeeman Energy on the Vortex of Spinor Bose-Einstein Condensates
• Second sound with ultracold atoms: A brief historical account
• Low lying twisting and acoustic modes of a rotating Bose-Einstein condensate
• Fermionic superfluidity with positive scattering length
• Vortex state in Bose-Fermi mixture with attraction between bosons and fermions
• Hysteresis effects in rotating Bose-Einstein condensates
• Intertwined orders from symmetry projected wavefunctions of repulsively interacting Fermi gases in optical lattices
• Correlations in the low-density Fermi gas: Fermi-Liquid state, Dimerization, and BCS Pairing
• Ultra cold atoms and Bose-Einstein condensation for quantum metrology
• Thermal bosons in 3d optical lattices via tensor networks
• Light scattering in Cooper-paired Fermi atoms
• Quantized vortices in ${}^4$He droplets: a quantum Monte Carlo study
• Semiclassical theory for spatial density oscillations in fermionic systems
• Collapse of a quantum vortex in an attractive two-dimensional Bose gas
• Thermodynamical approaches to efficient sympathetic cooling in ultracold Fermi-Bose atomic mixtures
• Unitarity in periodic potentials: a renormalization group analysis
• Polarized superfluids near their tricritical point
• Vortex core states in superfluid Fermi-Fermi mixtures with unequal masses
• Application of lasers to ultracold atoms and molecules
• Trapped p-wave superfluids: a local density approach
• Finite-range effects in dilute Fermi gases at unitarity
• Quantum vortices in fermionic superfluids: from ultracold atoms to neutron stars
• Collisionless dynamics in disordered superconductors
• Vortices on demand in multicomponent Bose-Einstein condensates
• Exciting the Higgs mode in a strongly-interacting Fermi gas by interaction modulation
• Phase transitions in the boson-fermion resonance model in one dimension
• Realizing Topological Mott Insulators from the RKKY Interaction
• Generalized Galitskii approach for the vertex function of a Fermi gas with resonant interaction
• $D$-dimensions Dirac fermions BEC-BCS cross-over thermodynamics
• Particle correlations in a fermi superfluid
• Quantum engineering of Majorana quasiparticles in one-dimensional optical lattices
• Observing the loss and revival of long-range phase coherence through disorder quenches
• Vortices in low-density neutron matter and cold Fermi gases
• Landau-Khalatnikov phonon damping in strongly interacting Fermi gases
• Effective field theory of boson-fermion mixtures and bound fermion states on a vortex of boson superfluid
• Induced interactions in the BCS-BEC crossover of two-dimensional Fermi gases with Rashba spin-orbit coupling
• Diversified vortex phase diagram for a rotating trapped two-band Fermi gas in the BCS-BEC crossover
• Unconventional interaction between vortices in a polarized Fermi gas
• Density fingerprint of giant vortices in Fermi gases near a Feshbach resonance
• Phase sensitive two mode squeezing and photon correlations from exciton superfluid
• Lifetime of angular momentum in a rotating strongly interacting Fermi gas
• Comprehensive classification for Bose-Fermi mixtures
• Finite Temperature Properties of Three-Component Fermion Systems in Optical Lattice
• Vortex lines attached to dark solitons in Bose-Einstein condensates and Boson-Vortex Duality in 3+1 Dimensions
• Meson Scattering in a Pion Superfluid
• Collective modes of Fermi superfluid containing vortices along the BEC-BCS crossover
• Heteronuclear quantum gas mixtures
• Density profile of noninteracting fermions in a rotating $2d$ trap at finite temperature
• Oscillatory-like Expansion of a Fermionic Superfluid
• Pair density waves and vortices in an elongated two-component Fermi gas
• Tuning of non-paraxial effects of the Laguerre-Gaussian beam interacting with the two-component Bose-Einstein condensates
• Quantum fluctuations and condensate fraction during the time-of-flight expansion
• Effective Lagrangian of unitary Fermi gas from $\epsilon$ expansion
• Ladder resummation of spin 1/2 fermion many-body systems with arbitrary partial-wave content
• Excess energy of an ultracold Fermi gas in a trapped geometry
• Magnetic Dipoles at Topological Defects in the Meissner State of a Nanostructured Superconductor
• Vortex structures of a two-component BEC for large anisotropies
• Transfer of orbital angular momentum superposition from asymmetric Laguerre-Gaussian beam to Bose-Einstein Condensate
• Collective Modes and Stability of Bose-Fermi Mixtures with a BCS-BEC Crossover
• Single- and two-qubit quantum gates using superimposed optical lattice potentials
• Simulating sympathetic cooling of atomic mixtures in nonlinear traps
• Vortex-core structure in a mixture of Bose and Fermi superfluids
• Verification of an analytic fit for the vortex core profile in superfluid Fermi gases
• Orbital magnetism of ultracold fermionic gases in a lattice: dynamical mean-field approach
• Optimizing Quantum Gas Production by an Evolutionary Algorithm
• Pairing Dynamics of Polar States in a Quenched p-wave Superfluid Fermi Gas
• Fulde-Ferrell pairing instability of a Rashba spin-orbit coupled Fermi gas
• Fractional and Integer Vortex Dynamics in Strongly Coupled Two-component Bose-Einstein Condensates from AdS/CFT Correspondence
• Fractional quantum Hall physics and higher-order momentum correlations in a few spinful fermionic contact-interacting ultracold atoms in rotating traps
• Stability and collapse of fermions in a binary dipolar boson-fermion 164Dy-161Dy mixture
• Two Nambu-Goldstone zero modes for rotating Bose-Einstein condensates
• Production of a highly degenerate Fermi gas of metastable helium-3 atoms
• Magnetization profile and core level spectroscopy in a multiply quantized vortex of imbalanced Fermi superfluids
• Breathing mode frequencies of a rotating Fermi gas in the BCS-BEC crossover region
• Emergent Fracton Hydrodynamics of Ultracold Atoms in Partially Filled Landau Levels
• Strong correlations in quantum vortex nucleation of ultracold atomic gases
• p-wave phase shift and scattering length of ${}^6$Li
• Phase separations induced by a trapping potential in one-dimensional fermionic systems as a source of core-shell structures
• Sound wave propagation in strongly elongated fermion clouds at finite collisionality
• Vortex Properties of a Resonant Superfluid
• Probing ultracold Fermi gases with light-induced gauge potentials
• Exact and asymptotic local virial theorems for finite fermionic systems
• Emergence and stability of spontaneous vortex lattices in exciton-polariton condensates
• A generalized effective spin-chain formalism for strongly interacting spinor gases in optical lattice
• On the Gravitational Wave to Matter Coupling of Superfluid Fermi Gases Near Unitarity
• Sound emission and annihilations in a programmable quantum vortex collider
• A Multi-Purpose Platform for Analog Quantum Simulation
• Rotating a Rashba-coupled Fermi gas in two dimensions
• Coherent control via interplay between driving field and two-body interaction in a double well
• Swallowtail Structure in Fermi Superfluids with Periodically Modulated Interactions
• Ultra-cold fermions in real or fictitious magnetic fields: The BCS-BEC evolution and the type-I--type-II transition
• Soliton appearing in boson-fermion mixture at the third order of the interaction radius
• Cold atoms at unitarity and inverse square interaction
• Twisting vortex lines regularize Navier-Stokes turbulence
• Calibrating the absorption imaging of cold atoms under high magnetic fields
• Thermodynamics of rotating quantum matter in the virial expansion
• Resonant Manipulation of d-wave Interaction of Cold Atoms with Two Lasers and a Magnetic Field
• Aspects of Superfluid Cold Atomic Gases in Optical Lattices
• Collective modes of vortex lattices in two-component Bose-Einstein condensates under synthetic gauge fields
• Creating fractional quantum Hall states with atomic clusters using light-assisted insertion of angular momentum
• Quantum gas of polar molecules ensembles at ultralow temperatures: f-wave superfluids
• Generalization of the Kutta-Joukowski theorem for the hydrodynamic forces acting on a quantized vortex
• Using modified Gaussian distribution to study the physical properties of one and two-component ultracold atoms
• Modelling quantum aspects of disruption of a white dwarf star by a black hole
• Do phase fluctuations influence the Fulde-Ferrell-Larkin-Ovchinnikov state in a 3D Fermi gas?
• Kosterlitz-Thouless transition and vortex-antivortex lattice melting in two-dimensional Fermi gases with $p$- or $d$-wave pairing
• Construction of a giant vortex state in a trapped Fermi system
• Experimental realization of BCS-BEC crossover physics with a Fermi gas of atoms
• Pairing in ultracold Fermi gases in the lowest Landau level
• Dynamics of shock waves in a superfluid unitary Fermi gas
• Fractional quantum anomalous Hall phase for Raman superarray of Rydberg atoms
• Exact quantum field mappings between different experiments on quantum gases
• Localization of particles in harmonic confinement: Effect of the interparticle interaction
• Non-local equation for the superconducting gap parameter
• Global superfluid phase diagram of three component fermions with magnetic ordering
• Asymmetric Conductivity of the Kondo Effect in Cold Atomic Systems
• Dynamics of quantum quenching for BCS-BEC systems in the shallow BEC regime
• Crow instability in unitary Fermi gas
• Resonant Superfluidity in an Optical Lattice
• Magnetic-field-induced tunability of spin Hamiltonians: Resonances and Efimov states in Yb${}_2$Ti${}_2$O${}_7$
• Natural orbits of atomic Cooper pairs in a nonuniform Fermi gas
• Many-body theories of density response for a strongly correlated Fermi gas
• Critical Zeeman Splitting of a Unitary Fermi Superfluid
• Pair correlated atoms with a twist
• Interplay between charge, magnetic and superconducting order in a Kondo lattice with an attractive Hubbard interaction
• Spectral properties and observables in ultracold Fermi gases
• Coherence vortices in one spatial dimension
• Direct production of fermionic superfluids in a cavity-enhanced optical dipole trap
• Rotational properties of superfluid Fermi-Bose mixtures in a tight toroidal trap
• Pairing imbalance in BCS-BEC crossover of inhomogeneous three-component Fermi-gas in two dimensions
• Composite boson signature in the interference pattern of atomic dimer condensates
• Topological two-band electron-hole superconductors with $d$-wave symmetry: Absence of Dirac quasiparticle annihilation in magic-angle twisted trilayer graphene
• Critical velocity, vortex shedding and drag in a unitary Fermi superfluid
• Induced superfluidity of imbalanced Fermi gases near unitarity
• Vortex and soliton dynamics in particle-hole symmetric superfluids
• Confinement induced interlayer molecules: a route to strong interatomic interactions
• Low energy density correlation function of the degenerate unitary Fermi gas from epsilon expansion
• Non-Abelian Majorana fermions in topological $s$-wave Fermi superfluids
• Tuning Dissipation and Excitations in Superfluid Fermi Gases with a Moving Impurity
• Interplay between Rashba spin-orbit coupling and adiabatic rotation in a two-dimensional Fermi gas
• Bipartite representations and many-body entanglement of pure states of $N$ indistinguishable particles
• Collective excitation and stability of flow-induced gapless Fermi superfluids
• Periodic dynamics of fermionic superfluids in the BCS regime
• Two-component repulsive atomic Fermi gases in a thin spherical shell
• Intrinsic decoherence and purity in a Bose quantum fluid in a triple well potential
• Tkachenko modes in a superfluid Fermi gas at unitarity
• Rapidly Rotating Fermions in an Anisotropic Trap
• Interaction Quench Dynamics and Stability of Quantum Vortices in Rotating Bose-Einstein Condensates
• Phase diagram of asymmetric Fermi gas across Feshbach resonance
• Critical currents in the BEC/BCS crossover regime
• Study of a degenerate dipolar Fermi gas of 161Dy atoms
• Fractionalization via ${\mathbb{Z}}_2$ Gauge Fields at a Cold Atom Quantum Hall Transition
• Quantum Effects at Low Energy Atom-Molecule Interface
• Pairing in spin polarized two-species fermionic mixtures with mass asymmetry
• Vortices in Bose-Einstein Condensates: Theory
• Superfluid density reduction and spin-imbalanced pairing in a fermionic superfluid due to dynamical boson exchange
• Superfluidity in atomic Fermi gases
• The Fermionic Density-functional at Feshbach Resonance
• Vortex shedding patterns in holographic superfluids at finite temperature
• Dynamics of large samples of repulsive Fermi gases at nonzero temperatures
• Dynamical mean-field equations for strongly interacting fermionic atoms in a potential trap
• Cold atoms beyond atomic physics
• Measuring densities of cold atomic clouds smaller than the resolution limit
• Scale and conformal invariance in rotating interacting few-fermion systems
• Fourth cluster and virial coefficients of a unitary Fermi gas for an arbitrary mass ratio
• Measurement of the $s$-wave scattering length between metastable helium isotopes
• Partition function of N composite bosons
• Dynamic generation of superflow in a fermionic ring through phase imprinting
• Unitary Fermi gas in the epsilon expansion
• Phase Separation of a Fast Rotating Boson-Fermion Mixture in the Lowest-Landau-Level Regime
• Theory of the Two-Particle Emission from Superfluid Fermi Gases in the BCS-BEC Crossover
• Nonequilibrium Dynamics of Ultracold Fermi Superfluids
• Beyond-mean-field phases of rotating dipolar condensates
• Artificial magnetism for a harmonically trapped Fermi gas in a synthetic magnetic field
• Vortex-lattice structures in rotating Bose-Fermi superfluid mixtures
• The normal state of attractive Fermi gases from coupled-cluster theory
• Spontaneous symmetry breaking in rotating condensates of ultracold atoms
• Vortex lattice in spin-imbalanced unitary Fermi gas
• Faraday Waves in strongly interacting superfluids
• When does a Fermi puddle become a Fermi sea? Emergence of pairing in two-dimensional trapped mesoscopic Fermi gases
• CNN-Based Vortex Detection in Atomic 2D Bose Gases in the Presence of a Phononic Background
• Fast mode of rotating atoms in one-dimensional lattice rings
• Superfluid Fraction of a 2D Bose-Einstein Condensate in a Triangular Lattice
• Cranked Hartree-Fock-Bogoliubov Calculation for Rotating Bose-Einstein Condensates
• Increasing the stability of a superfluid in a rotating necklace potential
• Scattering Resonances in a Degenerate Fermi Gas
• Voltage-controlled topological spin textures in the monolayer limit
• Wave-function microscopy: Derivation and anatomy of exact algebraic spinful wave functions and full Wigner-molecular spectra of a few highly correlated rapidly rotating ultracold fermionic atoms
• Time reversal symmetry protected chaotic fixed point in the quench dynamics of a topological $p$-wave superfluid
• Vortices in Fermi gases with spin-dependent rotation potentials
• Linear response of a superfluid Fermi gas inside its pair-breaking continuum
• Bragg spectroscopy and pair-breaking-continuum mode in a superfluid Fermi gas
• An Effective Series Expansion to the Equation of State of Unitary Fermi Gases
• Strong Coupling Effects on the Specific Heat of an Ultracold Fermi Gas in the Unitarity Limit
• When are two fermions a simple boson? New Gross-Pitaevskii actions for cold Fermi condensates
• Superfluidity and binary-correlations within clusters of fermions
• Unconventional color superfluidity in ultra-cold fermions: Quintuplet pairing, quintuple point and pentacriticality
• Electron-beam-induced shift in the apparent position of a pinned vortex in a thin superconducting film
• Generation of vortex dipoles in superfluid Fermi gas in BCS limit
• Acoustic attenuation rate in the Fermi-Bose model with a finite-range fermion-fermion interaction
• Resonant superfluidity in the Rabi-coupled spin-dependent Fermi-Hubbard model
• Route to observing topological edge modes in ultracold fermions
• Weighted Hartree-Fock-Bogoliubov method for interacting fermions: An application to ultracold Fermi superfluids
• Quantum simulation of the Hubbard model with ultracold fermions in optical lattices
• Phase spreading and temporal coherence of a pair-condensed Fermi gas at low temperature
• Quantum tidal locking in orbiting Bose-Einstein condensates
• Superfluidity of identical fermions in an optical lattice: atoms and polar molecules
• Vorticity-Crystalline Order Coupling in Supersolids: Excitations and Re-entrant Phases
• Quantum Computing Demonstration of the Polaron-Molecule Transition on a NISQ Device
• Physical Realization of von Neumann Lattices in Rotating Dipole-blockaded Bose Gases
• Pairing based cooling of Fermi gases
• Molecular regimes in ultracold Fermi gases
• Repulsive fermions and shell effects on the surface of a sphere
• Finite temperature effects in light scattering off Cooper-paired Fermi atoms
• Delta-Kick Collimation of Heteronuclear Feshbach Molecules
• Precise correspondence between the p-wave chiral superfluid and the spinless bosonic superfluid in the lowest Landau level
• Quench dynamics of neutral atoms in out-equilibrium one dimensional optical lattices
• Separation of quadrupole, spin, and charge across the magnetic phases of a one-dimensional interacting spin-1 gas
• Superfluidity of Total Angular Momentum
• Negative Echo in the Density Evolution of Ultracold Fermionic Gases
• Fluctuational susceptibility of ultracold bosons in the vicinity of condensation