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Title: Giant intrinsic photoresponse in pristine graphene

Abstract

When the Fermi level is aligned with the Dirac point of gra-phene, 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 pho-tocurrent in graphene, which occurs in a different parameter regime from all the previously observed photothermoelectric or photovoltaic photocurrents in graphene12–20: the photo-current 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 photo-current 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 kinemat-ics in charge-neutral graphene. Our results not only high-light 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.

Authors:
ORCiD logo; ; ; ORCiD logo; ; ; ; ; ; ORCiD logo; ; ; ; ; ORCiD logo; ; ORCiD logo
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566618
DOE Contract Number:  
SC0001088
Resource Type:
Journal Article
Journal Name:
Nature Nanotechnology
Additional Journal Information:
Journal Volume: 14; Journal Issue: 2; Journal ID: ISSN 1748-3387
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
solar (photovoltaic), solid state lighting, photosynthesis (natural and artificial), charge transport, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)

Citation Formats

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, Taniguchi, Takashi, Xu, Su-Yang, Kong, Jing, Palacios, Tomás, Gedik, Nuh, Gabor, Nathaniel M., and Jarillo-Herrero, Pablo. Giant intrinsic photoresponse in pristine graphene. United States: N. p., 2018. Web. doi:10.1038/s41565-018-0323-8.
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, Taniguchi, Takashi, Xu, Su-Yang, Kong, Jing, Palacios, Tomás, Gedik, Nuh, Gabor, Nathaniel M., & Jarillo-Herrero, Pablo. Giant intrinsic photoresponse in pristine graphene. United States. doi:10.1038/s41565-018-0323-8.
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, Taniguchi, Takashi, Xu, Su-Yang, Kong, Jing, Palacios, Tomás, Gedik, Nuh, Gabor, Nathaniel M., and Jarillo-Herrero, Pablo. Mon . "Giant intrinsic photoresponse in pristine graphene". United States. doi:10.1038/s41565-018-0323-8.
@article{osti_1566618,
title = {Giant intrinsic photoresponse in pristine graphene},
author = {Ma, Qiong and Lui, Chun Hung and Song, Justin C. W. and Lin, Yuxuan and Kong, Jian Feng and Cao, Yuan and Dinh, Thao H. and Nair, Nityan L. and Fang, Wenjing and Watanabe, Kenji and Taniguchi, Takashi and Xu, Su-Yang and Kong, Jing and Palacios, Tomás and Gedik, Nuh and Gabor, Nathaniel M. and Jarillo-Herrero, Pablo},
abstractNote = {When the Fermi level is aligned with the Dirac point of gra-phene, 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 pho-tocurrent in graphene, which occurs in a different parameter regime from all the previously observed photothermoelectric or photovoltaic photocurrents in graphene12–20: the photo-current 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 photo-current 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 kinemat-ics in charge-neutral graphene. Our results not only high-light 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.},
doi = {10.1038/s41565-018-0323-8},
journal = {Nature Nanotechnology},
issn = {1748-3387},
number = 2,
volume = 14,
place = {United States},
year = {2018},
month = {12}
}

Works referenced in this record:

The electronic properties of graphene
journal, January 2009

  • Castro Neto, A. H.; Guinea, F.; Peres, N. M. R.
  • Reviews of Modern Physics, Vol. 81, Issue 1, p. 109-162
  • DOI: 10.1103/RevModPhys.81.109

Electronic transport in two-dimensional graphene
journal, May 2011

  • Das Sarma, S.; Adam, Shaffique; Hwang, E. H.
  • Reviews of Modern Physics, Vol. 83, Issue 2, p. 407-470
  • DOI: 10.1103/RevModPhys.83.407