Light incident on an ultrathin topological insulator film generates surface-projected transverse pure spin currents with s-wave and d-wave rotational symmetry, and a gate voltage can turn them into a net spin current.
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Transverse spin photocurrents in ultrathin topological insulator films
Light incident on an ultrathin topological insulator film generates surface-projected transverse pure spin currents with s-wave and d-wave rotational symmetry, and a gate voltage can turn them into a net spin current.