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Giant intrinsic photoresponse in pristine graphene
Name
1812.07111.pdf
Size
1.7 MB
Format
Adobe PDF
Checksum (MD5)
24f6e004c641d392055dc4f0878010d2
Author(s)
Ma, Qiong
Lui, Chun Hung
Song, Justin C. W.
Lin, Yuxuan
Kong, Jian Feng
Cao, Yuan
Dinh, Thao H.
Nair, Nityan L.
Fang, Wenjing
Watanabe, Kenji
Journal
Nature Nanotechnology
Publisher
Nature Publishing Group
Citation
Ma, Qiong et al. “Giant Intrinsic Photoresponse in Pristine Graphene.” Nature Nanotechnology 14, 2 (December 2018): 145–150 © The Author(s)
Version
Author's final manuscript
Abstract
When the Fermi level is aligned with the Dirac point of graphene, reduced charge screening greatly enhances electron–electron scattering 1–5 . In an optically excited system, the kinematics of electron–electron scattering in Dirac fermions is predicted to give rise to novel optoelectronic phenomena 6–11 . In this paper, we report on the observation of an intrinsic photocurrent in graphene, which occurs in a different parameter regime from all the previously observed photothermoelectric or photovoltaic photocurrents in graphene 12–20 : the photocurrent emerges exclusively at the charge neutrality point, requiring no finite doping. Unlike other photocurrent types that are enhanced near p–n or contact junctions, the photocurrent observed in our work arises near the edges/corners. By systematic data analyses, we show that the phenomenon stems from the unique electron–electron scattering kinematics in charge-neutral graphene. Our results not only highlight the intriguing electron dynamics in the optoelectronic response of Dirac fermions, but also offer a new scheme for photodetection and energy harvesting applications based on intrinsic, charge-neutral Dirac fermions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1038/s41565-018-0323-8
