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- W4304014025 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." @default.
- W4304014025 created "2022-10-10" @default.
- W4304014025 creator A5017322345 @default.
- W4304014025 creator A5023114784 @default.
- W4304014025 creator A5038648935 @default.
- W4304014025 date "2022-10-10" @default.
- W4304014025 modified "2023-10-05" @default.
- W4304014025 title "Optical spin conductivity in ultracold quantum gases" @default.
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