Zero-bias photocurrent in ferromagnetic topological insulator

N. Ogawa, R. Yoshimi, K. Yasuda, A. Tsukazaki, M. Kawasaki, Y. Tokura

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Magnetic interactions in topological insulators cause essential modifications in the originally mass-less surface states. They offer a mass gap at the Dirac point and/or largely deform the energy dispersion, providing a new path towards exotic physics and applications to realize dissipation-less electronics. The nonequilibrium electron dynamics at these modified Dirac states unveil additional functions, such as highly efficient photon to spin-current conversion. Here we demonstrate the generation of large zero-bias photocurrent in magnetic topological insulator thin films on mid-infrared photoexcitation, pointing to the controllable band asymmetry in the momentum space. The photocurrent spectra with a maximal response to the intra-Dirac-band excitations can be a sensitive measure for the correlation between Dirac electrons and magnetic moments.

Original languageEnglish
Article number12246
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Jul 20

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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