Please use this identifier to cite or link to this item:
|Title:||Giant intrinsic photoresponse in pristine graphene||Authors:||Ma, Qiong
Lui, Chun Hung
Song, Justin Chien Wen
Kong, Jian Feng
Dinh, Thao H.
Nair, Nityan L.
Gabor, Nathaniel M.
|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.||URI:||https://hdl.handle.net/10356/138037||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|
Files in This Item:
|Giant Intrinsic Photoresponse In Pristine Graphene.pdf||1.74 MB||Adobe PDF||View/Open|
Updated on Nov 30, 2022
Web of ScienceTM
Updated on Dec 3, 2022
Updated on Dec 5, 2022
Updated on Dec 5, 2022
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.