Photo-induced currents in the topological insulator Bi2Se3

ORAL

Abstract

We report the observation of photo-induced currents in micro-devices built from exfoliated single crystals of Bi2Se3. Our experiments are performed using ultrashort laser pulses at 800 nm and in the absence of an applied bias. We find that the induced currents scale quadratically with laser field strength, confirming their second order nature. We will present the temperature dependence of these second order currents and discuss their microscopic origin.

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Authors

  • James McIver

    Department of Physics, MIT, Cambridge, MA 02139, Department of Physics, Massachusetts Institute of Technology, Cambridge MA 02139

  • David Hsieh

    Department of Physics, MIT, Cambridge, MA 02139

  • Hadar Steinberg

    MIT, Department of Physics, MIT, Cambridge, MA 02139

  • Pablo Jarillo-Herrero

    MIT, Department of Physics, MIT, Cambridge, MA 02139

  • Nuh Gedik

    Massachusetts Institute of Technology, MIT, Department of Physics, MIT, Cambridge, MA 02139, Department of Physics, Massachusetts Institute of Technology, Cambridge MA 02139