Spin Transport in Polaronic and Superfluid Fermi Gases

Abstract

We present measurements of spin transport in ultracold gases of fermionic lithium-6 in a mixture of two spin states at a Feshbach resonance. In particular, we study the spin dipole mode, where the two spin components are displaced from each other against a harmonic restoring force. We prepare a highly-imbalanced, or polaronic, spin mixture with a spin dipole excitation and observe strong, unitarity limited damping of the spin dipole mode. In gases with small spin imbalance, below the Pauli limit for superfluidity, we observe strongly damped spin flow despite the presence of a superfluid core.

14 pages, 4 figures

References in corpus (24)

• Theory of ultracold Fermi gases
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• Universal Quantum Viscosity in a Unitary Fermi Gas
• Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
• Phase diagram of a two-component Fermi gas with resonant interactions
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Universal Spin Transport in a Strongly Interacting Fermi Gas
• Normal state of a polarized Fermi gas at unitarity
• Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
• Normal state of highly polarized Fermi gases: Full many-body treatment
• Critical velocity for superfluid flow across the BEC-BCS crossover
• Observation of Anomalous Spin Segregation in a Trapped Fermi Gas
• Phase-slip induced dissipation in an atomic Bose-Hubbard system
• Thermodynamics of balanced and slightly spin-imbalanced Fermi gases at unitarity
• Spin Drag and Spin-Charge Separation in Cold Fermi Gases
• Determination of the Equation of State of a Two-Component Fermi Gas at Unitarity
• Collisional Properties of a Polarized Fermi Gas with Resonant Interactions
• The role of interactions in spin-polarised atomic Fermi gases at unitarity
• Spin drag in an ultracold Fermi gas on the verge of a ferromagnetic instability
• Normal-Superfluid Interface Scattering For Polarized Fermion Gases
• Spin-drag relaxation time in one-dimensional spin-polarized Fermi gases

Cited by in corpus (50)

• Homogeneous Atomic Fermi Gases
• Spin Transport in a Mott Insulator of Ultracold Fermions
• Two-terminal transport measurements with cold atoms
• Boiling a Unitary Fermi Liquid
• Non-equilibrium quantum dynamics and formation of the Bose polaron
• Strongly Interacting Isotopic Bose-Fermi Mixture Immersed in a Fermi Sea
• Universal spin dynamics in two-dimensional Fermi gases
• Imbalanced Fermi Gases at Unitarity
• Quantum mechanical limitations to spin diffusion in the unitary Fermi gas
• Observation of quantum-limited spin transport in strongly interacting two-dimensional Fermi gases
• Real-time energy dynamics in spin-1/2 Heisenberg chains
• Pseudogaps in strongly interacting Fermi gases
• Quantum Breathing of an Impurity in a One-dimensional Bath of Interacting Bosons
• Observation of the Leggett-Rice effect in a unitary Fermi gas
• Dynamics of an impurity in a one-dimensional lattice
• Finite-temperature equation of state of polarized fermions at unitarity
• Shear viscosity and spin diffusion coefficient of a two-dimensional Fermi gas
• Shear viscosity and spin diffusion in a two-dimensional Fermi gas
• Universal Spin Transport and Quantum Bounds for Unitary Fermions
• Probing strongly interacting atomic gases with energetic atoms
• Collision of two spin polarized fermionic clouds
• Spin-polarized droplets in the unitary Fermi gas
• Anomalous Transport in the Superfluid Fluctuation Regime
• Metastability in Spin-Polarized Fermi Gases
• Polarons in Extremely Polarized Fermi Gases: The Strongly Interacting 6Li-40K Mixture
• Heat and spin transport in a cold atomic Fermi gas
• Spin diffusion in trapped clouds of strongly interacting cold atoms
• Boltzmann equation simulation for a trapped Fermi gas of atoms
• Intersections of ultracold atomic polarons and nuclear clusters: How is a chart of nuclides modified in dilute neutron matter?
• Binding two and three $\alpha$ particles in cold neutron matter
• Slow dynamics of a mobile impurity interacting with an Anderson insulator
• Spin Drag of a Fermi Gas in a Harmonic Trap
• Mean square displacement of a free quantum particle in a thermal state
• Collisional dynamics of polaronic clouds immersed in a Fermi sea
• Quasiparticle lifetime in ultracold fermionic mixtures with density and mass imbalance
• Optical spin conductivity in ultracold quantum gases
• Superdiffusive nonequilibrium motion of an impurity in a Fermi sea
• Transport of Spin and Mass at Normal-Superfluid Interfaces in the Unitary Fermi Gas
• Polar molecules in bilayers with high population imbalance
• Spin diffusion in ultracold spin-orbit coupled ${}^{40}$K gas
• Collisionless spin dynamics in a magnetic field gradient
• Density and spin modes in imbalanced normal Fermi gases from collisionless to hydrodynamic regime
• Magnetic polarons in two-component hard core bosons
• Nonergodic dynamics for an impurity interacting with bosons in tilted lattice
• Isothermal compressibility and effects of multi-body molecular interactions in a strongly interacting ultracold Fermi gas
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Thermomagnetic Anomalies by Magnonic Criticality in Ultracold Atomic Transport
• Exact perturbative expansion of the transport coefficients of a normal low-temperature Fermi gas with contact interactions
• Thermomagnetic anomalies in quantum magnon transport caused by tunable junction geometries in cold atomic systems
• Crossover from collisionless to collisional spin dynamics of polarized fermions