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Title: Giant hall photoconductivity in narrow-gapped dirac materials
Authors: Song, Justin Chien Wen
Kats, Mikhail A.
Keywords: Science::Physics
Issue Date: 2016
Source: Song, J. C. W., & Kats, M. A. (2016). Giant hall photoconductivity in narrow-gapped dirac materials. Nano Letters, 16(12), 7346−7351. doi:10.1021/acs.nanolett.6b02559
Journal: Nano Letters
Abstract: Carrier dynamics acquire a new character in the presence of Bloch-band Berry curvature, which naturally arises in gapped Dirac materials (GDMs). Here, we argue that photoresponse in GDMs with small band gaps is dramatically enhanced by Berry curvature. This manifests in a giant and saturable Hall photoconductivity when illuminated by circularly polarized light. Unlike Hall motion arising from a Lorentz force in a magnetic field, which impedes longitudinal carrier motion, Hall photoconductivity arising from Berry curvature can boost longitudinal carrier transport. In GDMs, this results in a helicity-dependent photoresponse in the Hall regime, where photoconductivity is dominated by its Hall component. We find that the induced Hall conductivity per incident irradiance is enhanced by up to 6 orders of magnitude when moving from the visible regime (with corresponding band gaps) to the far infrared. These results suggest that narrow-gap GDMs are an ideal test-bed for the unique physics that arise in the presence of Berry curvature and open a new avenue for infrared and terahertz optoelectronics.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.6b02559
Schools: School of Physical and Mathematical Sciences 
Organisations: Institute of High Performance Computing, A*STAR
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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