Observation of Terahertz Spin Hall Conductivity Spectrum in GaAs with Optical Spin Injection

We report the first observation of the spin Hall conductivity spectrum in GaAs at room temperature. After the optical injection of spin-polarized carriers, polarization rotation of a terahertz pulse is observed as a manifestation of the inverse spin Hall effect. The spectrum for the spin Hall conductivity of electrons exhibits an excellent agreement with microscopic theories only using known parameters. The results clearly demonstrate that, unlike in the DC regime, the intrinsic Berry-curvature mechanism is dominant in terahertz frequency, enabling high-speed less-dissipative charge-spin current conversion.Comment: 18 pages, 4 figure

Distinct Metabolites for Photoreactive L-Phenylalanine Derivatives in Klebsiella sp. CK6 Isolated from Rhizosphere of a Wild Dipterocarp Sapling

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