Zero-bias photocurrent in ferromagnetic topological insulator

N. Ogawa (), R. Yoshimi, K. Yasuda, A. Tsukazaki, M. Kawasaki and Y. Tokura
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N. Ogawa: RIKEN Center for Emergent Matter Science (CEMS)
R. Yoshimi: University of Tokyo
K. Yasuda: University of Tokyo
A. Tsukazaki: Institute for Materials Research, Tohoku University
M. Kawasaki: RIKEN Center for Emergent Matter Science (CEMS)
Y. Tokura: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: 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.

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12246

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DOI: 10.1038/ncomms12246

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