Optical spin conductivity in ultracold quantum gases
arXiv:2103.02418 · doi:10.1103/PhysRevResearch.4.043014
Abstract
We show that the optical spin conductivity being a small AC response of a bulk spin current and elusive in condensed matter systems can be measured in ultracold atoms. We demonstrate that this conductivity contains rich information on quantum states by analyzing experimentally achievable systems such as a spin-1/2 superfluid Fermi gas, a spin-1 Bose-Einstein condensate, and a Tomonaga-Luttinger liquid. The obtained conductivity spectra being absent in the Drude conductivity reflect quasiparticle excitations and non-Fermi liquid properties. Accessible physical quantities include the superfluid gap and the contact for the superfluid Fermi gas, gapped and gapless spin excitations as well as quantum depletion for the Bose-Einstein condensate, and the spin part of the Tomonaga-Luttinger liquid parameter elusive in cold-atom experiments. Unlike its mass transport counterpart, the spin conductivity serves as a probe applicable to clean atomic gases without disorder and lattice potentials. Our formalism can be generalized to various systems such as spin-orbit coupled and nonequilibrium systems.
arXiv comment17 pages, 3 figures; published version
References in corpus (80)
- Topological insulators and superconductors
- A spin-orbit coupled Bose-Einstein condensate
- Theory of ultracold Fermi gases
- Quantum Spin Liquids
- Spinor Bose Condensates in Optical Traps
- Bose-Einstein condensation with internal degrees of freedom in alkali atom gases
- The dynamics of component separation in a binary mixture of Bose-Einstein condensates
- Floquet Time Crystals
- Spinor Bose-Einstein condensates
- Spin-orbit coupling in quantum gases
- Spin-Orbit Coupled Degenerate Fermi Gases
- Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
- Probing Topological Spin Liquids on a Programmable Quantum Simulator
- Evidence for a Structurally-driven Insulator-to-metal Transition in VO2: a View from the Ultrafast Timescale
- Large momentum part of fermions with large scattering length
- Energetics of a strongly correlated Fermi gas
- Using photoemission spectroscopy to probe a strongly interacting Fermi gas
- Measurements of Relative Phase in Binary Mixtures of Bose-Einstein Condensates
- Tools for quantum simulation with ultracold atoms in optical lattices
- Fermionic transport in a homogeneous Hubbard model: Out-of-equilibrium dynamics with ultracold atoms
- Generalized Virial Theorem and Pressure Relation for a strongly correlated Fermi gas
- Dynamic exchange coupling in magnetic bilayers
- Observation of pseudogap behavior in a strongly interacting Fermi gas
- Universal Spin Transport in a Strongly Interacting Fermi Gas
- Expansion dynamics of interacting bosons in homogeneous lattices in one and two dimensions
- Realization of SU(2)*SU(6) Fermi System
- Spin transport in a tunable Heisenberg model realized with ultracold atoms
- Bad metallic transport in a cold atom Fermi-Hubbard system
- Sachdev-Ye-Kitaev Models and Beyond: A Window into Non-Fermi Liquids
- Quantum gas microscopy of Kardar-Parisi-Zhang superdiffusion
- Far-from-equilibrium spin transport in Heisenberg quantum magnets
- The spin Hall effect in a quantum gas
- Roadmap on Atomtronics: State of the art and perspective
- Probing real-space and time resolved correlation functions with many-body Ramsey interferometry
- Spin Transport in a Mott Insulator of Ultracold Fermions
- Mechanical generation of spin current by spin-rotation coupling
- Two-terminal transport measurements with cold atoms
- Spin gradient demagnetization cooling of ultracold atoms
- Collisionally Induced Transport in Periodic Potentials
- Nonequilibrium Steady State of Photoexcited Correlated Electrons in the Presence of Dissipation
- Interaction-controlled transport of an ultracold Fermi gas
- Superdiffusion in spin chains
- Experimental observation of a large ac-spin Hall effect
- Transverse Demagnetization Dynamics of a Unitary Fermi Gas
- Detection of the microwave spin pumping using the inverse spin Hall effect
- Exploring the ferromagnetic behaviour of a repulsive Fermi gas via spin dynamics
- Creating State-Dependent Lattices for Ultracold Fermions by Magnetic Gradient Modulation
- Breakdown of Fermi liquid description for strongly interacting fermions
- Universal spin dynamics in two-dimensional Fermi gases
- Spectral response and contact of the unitary Fermi gas
- Shift charge and spin photocurrents in Dirac surface states of topological insulator
- Quantum mechanical limitations to spin diffusion in the unitary Fermi gas
- Direct detection of pure spin-current by x-ray pump-probe measurements
- Efficient Quantum Algorithm for Computing n-time Correlation Functions
- Excitation Spectrum and Superfluid Gap of an Ultracold Fermi Gas
- Contact and sum-rules in a near-uniform Fermi gas at unitarity
- Phase-sensitive detection of spin pumping via the ac inverse spin Hall effect
- Bogoliubov Theory and Lee-Huang-Yang Corrections in Spin-1 and Spin-2 Bose-Einstein Condensates in the Presence of the Quadratic Zeeman Effect
- Conductivity spectrum of ultracold atoms in an optical lattice
- Pseudogaps in strongly interacting Fermi gases
- Non-Equilibrium Mass Transport in the 1D Fermi-Hubbard Model
- Spin Transport in Polaronic and Superfluid Fermi Gases
- Current response, structure factor and hydrodynamic quantities of a two- and three-dimensional Fermi gas from the operator-product expansion
- Ground-state thermodynamic quantities of homogeneous spin- fermions from the BCS region to the unitarity limit
- Anomalous low-frequency conductivity in easy-plane XXZ spin chains
- Spin current generation and relaxation in a quenched spin-orbit-coupled Bose-Einstein condensate
- From Non-Hermitian Linear Response to Dynamical Correlations and Fluctuation-Dissipation Relations in Quantum Many-Body Systems
- Universal Spin Transport and Quantum Bounds for Unitary Fermions
- Intrinsic Photoconductivity of Ultracold Fermions in Optical Lattices
- Noninvasive Measurement of Dynamic Correlation Functions
- General properties of response functions of nonequilibrium steady states
- Probing eigenstate thermalization in quantum simulators via fluctuation-dissipation relations
- Probing the optical conductivity of trapped charge-neutral quantum gases
- Quantum Memory Assisted Probing of Dynamical Spin Correlations
- Sum Rules and Asymptotic Behaviors for Optical Conductivity of Nonequilibrium Many-Electron Systems
- Spin drag and fast response in a quantum mixture of atomic gases
- Shear viscosity and spin sum rules in strongly interacting Fermi gases
- Optical spin transport theory of spin-1/2 topological Fermi superfluids
- Probing unitary two-time correlations in a neutral atom quantum simulator
- Reducing backaction when measuring temporal correlations in quantum systems
Cited by in corpus (5)
- Non-Hermitian topological Fermi superfluid near the -wave unitary limit
- Spin and Density Modes in a Binary Fluid of Light
- Spin transport between polarized Fermi gases near the ferromagnetic phase transition
- Spin conductivity spectrum and spin superfluidity in a binary Bose mixture
- Finite-frequency normal and superfluid drag effects in two-component atomic Bose-Einstein condensates