Mesoscopic spin transport between strongly interacting Fermi gases

Abstract

We investigate a mesoscopic spin current for strongly interacting Fermi gases through a quantum point contact. Under the situation where spin polarizations in left and right reservoirs are same in magnitude but opposite in sign, we calculate the contribution of quasiparticles to the current by means of the linear response theory and many-body $T$-matrix approximation. For a small spin-bias regime, the current in the vicinity of the superfluid transition temperature is strongly suppressed due to the formation of pseudogaps. For a large spin-bias regime where the gases become highly polarized, on the other hand, the current is affected by the enhancement of a minority density of states due to Fermi polarons. We also discuss the broadening of a quasiparticle peak associated with an attractive polaron at a large momentum, which is relevant to the enhancement.

arXiv comment12 pages, 12 figures

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• Polaron Problems in Ultracold Atoms: Role of a Fermi Sea across Different Spatial Dimensions and Quantum Fluctuations of a Bose Medium
• Comparative study for two-terminal transport through a lossy one-dimensional quantum wire
• Multi-Particle Tunneling Transport at Strongly-Correlated Interfaces
• Collisional dynamics of polaronic clouds immersed in a Fermi sea
• Proposed Fermi-surface reservoir-engineering and application to realizing unconventional Fermi superfluids in a driven-dissipative non-equilibrium Fermi gas
• Optical spin transport theory of spin-1/2 topological Fermi superfluids
• Polaronic Proton and Diproton Clustering in Neutron-Rich Matter
• Nonequilibrium noise as a probe of pair-tunneling transport in the BCS--BEC Crossover
• Irreversible entropy transport enhanced by fermionic superfluidity
• Transport of Spin and Mass at Normal-Superfluid Interfaces in the Unitary Fermi Gas
• Probing Goldstino excitation through the tunneling transport in a Bose-Fermi mixture with explicitly broken supersymmetry
• Spin transport between polarized Fermi gases near the ferromagnetic phase transition
• Dominant Andreev Reflection through Nonlinear Radio-Frequency Transport
• Magnonic spin current shot noise in an itinerant Fermi gas
• Saturation of thermal and spin conductances in a dissipative superfluid junction
• Thermomagnetic anomalies in quantum magnon transport caused by tunable junction geometries in cold atomic systems
• Tunneling Hamiltonian analysis of DC Josephson currents in a weakly-interacting Bose-Einstein condensate