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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.||URI:||https://hdl.handle.net/10356/137991||ISSN:||1530-6984||DOI:||10.1021/acs.nanolett.6b02559||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 https://doi.org/10.1021/acs.nanolett.6b02559||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||SPMS Journal Articles|
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