Quasiparticle dynamics of topological insulator Bi2Se3 studied by time and angle-resolved photoemission spectroscopy

ORAL

Abstract

Topological insulator is a new state of matter that hosts spin helical surface states that may be important for future spintronic applications. Even though the conical bandstructure of the helical Dirac fermions is well established, elastic and inelastic scattering rates of their excitations are less well known because conventional transport or optical techniques can not easily separate surface contribution from bulk effects. Here we use time and angle-resolved photoemission spectroscopy to study the surface electron time-domain dynamics of a prototypical topological insulator Bi$_{2}$Se$_{3}$. We observe non-Fermi liquid behavior of quasiparticles both above and below the Fermi level. Our result suggests that surface-bulk scattering can play an important role in the transport properties of topological insulator.

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Authors

  • Yihua Wang

    MIT

  • David Hsieh

    MIT

  • Edbert Sie

    MIT

  • Dillon Gardner

    MIT

  • Hadar Steinberg

    MIT

  • Young Lee

    MIT, Massachusetts Institute of Technology

  • Pablo Jarillo-Herrero

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

  • Nuh Gedik

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