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• W3102795360 abstract "The propagation of electrons and photons can respectively have the spin-momentum locking effect which correlates the spin with the linear momentum. For the surface electrons in three-dimensional topological insulators (TIs), their spin is locked to the transport direction. For photons in optical fibers and photonic waveguides, they carry transverse spin angular momentum (SAM) which is also locked to the propagation direction. A direct connection between the electronic and the optical spins occurs in TIs with lifted spin degeneracy, which leads to spin-dependent selection rules of optical transitions and results in phenomena such as circular photogalvanic effect (CPGE). Here, we demonstrate an optoelectronic device that integrates a TI with a photonic waveguide. Interaction between the photons in the transverse-magnetic (TM) mode of the waveguide, which carries transverse SAM, and the surface electrons in a Bi2Se3 layer generates a directional, spin-polarized photocurrent. Because of optical spin-momentum locking, the device works in a non-reciprocal way such that changing the light propagation direction reverses the photon spin and thus the direction of the photocurrent in the TI. This novel device provides a directional interface that directly converts the photon propagation path to the direction and spin polarization of the photo-excited surface current in the TI. It represents a new way of implementing coupled spin-orbit interaction between electrons and photons and may lead to significant applications in opto-spintronics and quantum information processing." @default.
• W3102795360 created "2020-11-23" @default.
• W3102795360 creator A5013788046 @default.
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• W3102795360 date "2017-12-01" @default.
• W3102795360 modified "2023-10-15" @default.
• W3102795360 title "Spin-momentum locked interaction between guided photons and surface electrons in topological insulators" @default.
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• W3102795360 doi "https://doi.org/10.1038/s41467-017-02264-y" @default.
• W3102795360 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29247165" @default.
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