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Control over topological insulator photocurrents with light polarization

McIver, J. W. and Hsieh, D. and Steinberg, H. and Jarillo-Herrero, P. and Gedik, N. (2012) Control over topological insulator photocurrents with light polarization. Nature Nanotechnology, 7 (2). pp. 96-100. ISSN 1748-3387. doi:10.1038/nnano.2011.214.

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Three-dimensional topological insulators represent a new quantum phase of matter with spin-polarized surface states that are protected from backscattering. The static electronic properties of these surface states have been comprehensively imaged by both photoemission and tunnelling spectroscopies. Theorists have proposed that topological surface states can also exhibit novel electronic responses to light, such as topological quantum phase transitions and spin-polarized electrical currents. However, the effects of optically driving a topological insulator out of equilibrium have remained largely unexplored experimentally, and no photocurrents have been measured. Here, we show that illuminating the topological insulator Bi_2Se_3 with circularly polarized light generates a photocurrent that originates from topological helical Dirac fermions, and that reversing the helicity of the light reverses the direction of the photocurrent. We also observe a photocurrent that is controlled by the linear polarization of light and argue that it may also have a topological surface state origin. This approach may allow the probing of dynamic properties of topological insulators and lead to novel opto-spintronic devices.

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Hsieh, D.0000-0002-0812-955X
Additional Information:© 2012 Macmillan Publishers Limited. All rights reserved. Received 24 August 2011; accepted 2 November 2011; published online 4 December 2011. This work was supported by the Department of Energy (DOE) (award no. DE-FG02- 08ER46521), and was performed in part at the National Science Foundation (NSF) funded Harvard Center for Nanoscale Systems. Use was made of the Materials Research Science and Engineering Center Shared Experimental Facilities supported by the NSF (award no. DMR–0819762). J.W.M. acknowledges financial support from an NSF graduate research fellowship. D.H. acknowledges support from a Pappalardo postdoctoral fellowship. H.S. acknowledges support from the Israeli Ministry of Science. P.J-H. acknowledges support from a DOE Early Career Award (no. DE.SC0006418) and a Packard Fellowship.
Funding AgencyGrant Number
Deparment of EnergyDE-FG02- 08ER46521
NSF Graduate Research FellowshipUNSPECIFIED
Pappalardo postdoctoral fellowshipUNSPECIFIED
Department of Energy (DOE)DE-SC0006418
David and Lucile Packard FoundationUNSPECIFIED
Israeli Ministry of ScienceUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20140813-115757588
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48510
Deposited By: Joy Painter
Deposited On:13 Aug 2014 19:18
Last Modified:10 Nov 2021 18:32

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