Generation of Transient Photocurrents in the Topological Surface State of Sb_{2}Te_{3} by Direct Optical Excitation with Midinfrared Pulses.

@article{Kuroda2016GenerationOT,
  title={Generation of Transient Photocurrents in the Topological Surface State of Sb\_\{2\}Te\_\{3\} by Direct Optical Excitation with Midinfrared Pulses.},
  author={Kenta Kuroda and Johannes Reimann and Jens G{\"u}dde and Ulrich H{\"o}fer},
  journal={Physical review letters},
  year={2016},
  volume={116 7},
  pages={
          076801
        }
}
We combine tunable midinfrared (mid-IR) pump pulses with time- and angle-resolved two-photon photoemission to study ultrafast photoexcitation of the topological surface state (TSS) of Sb_{2}Te_{3}. It is revealed that mid-IR pulses permit a direct excitation from the occupied to the unoccupied part of the TSS across the Dirac point. The novel optical coupling induces asymmetric transient populations of the TSS at ±k_{∥}, which reflects a macroscopic photoexcited electric surface current. By… 
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