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Title: Giant intrinsic photoresponse in pristine graphene
Authors: Ma, Qiong
Lui, Chun Hung
Song, Justin Chien Wen
Lin, Yuxuan
Kong, Jian Feng
Cao, Yuan
Dinh, Thao H.
Nair, Nityan L.
Fang, Wenjing
Watanabe, Kenji
Taniguchi, Takashi
Xu, Su-Yang
Kong, Jing
Palacios, Tomás
Gedik, Nuh
Gabor, Nathaniel M.
Jarillo-Herrero, Pablo
Keywords: Science::Physics
Issue Date: 2018
Source: Ma, Q., Lui, C.H., Song, J.C.W., Lin, Y., Long, J. F., Cao, Y., . . . Jarillo-Herrero, P. (2019). Giant intrinsic photoresponse in pristine graphene. Nature Nanotechnology, 14(2), 145–150. doi:10.1038/s41565-018-0323-8
Journal: Nature Nanotechnology
Abstract: When the Fermi level is aligned with the Dirac point of graphene, reduced charge screening greatly enhances electron-electron scattering1-5. In an optically excited system, the kinematics of electron-electron scattering in Dirac fermions is predicted to give rise to novel optoelectronic phenomena6-11. 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 graphene12-20: 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.
ISSN: 1748-3387
DOI: 10.1038/s41565-018-0323-8
Rights: © 2018 The Author(s). All rights reserved. This paper was published by Springer Nature Limited in Nature Nanotechnology and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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