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- W2620791808 abstract "The three-dimensional topological insulator Bi2Se3 presents two cone-like dispersive topological surface states centered at the [Formula: see text] point. One of them is unoccupied in equilibrium conditions and located 1.8 eV above the other one lying close to the Fermi level. In this work we employ time- and angle-resolved photoemission spectroscopy with circularly polarized pump photons to selectively track the spin dynamics of the empty topological states. We observe that spin-polarized electrons flow along the topological cone and recombine towards the unpolarized bulk states on a timescale of few tens of femtoseconds. This provides direct evidence of the capability to trigger a spin current with circularly polarized light." @default.
- W2620791808 created "2017-06-09" @default.
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- W2620791808 date "2017-06-22" @default.
- W2620791808 modified "2023-10-13" @default.
- W2620791808 title "Ultrafast spin-polarized electron dynamics in the unoccupied topological surface state of Bi<sub>2</sub>Se<sub>3</sub>" @default.
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- W2620791808 doi "https://doi.org/10.1088/1361-648x/aa76c0" @default.
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