High-field terahertz response of graphene

M J Paul; Y C Chang; Z J Thompson; A Stickel; J Wardini; H Choi; E D Minot; B Hou; J A Nees; T B Norris; Yun-Shik Lee

doi:10.1088/1367-2630/15/8/085019

New Journal of Physics (Jan 2013)

High-field terahertz response of graphene

M J Paul,
Y C Chang,
Z J Thompson,
A Stickel,
J Wardini,
H Choi,
E D Minot,
B Hou,
J A Nees,
T B Norris,
Yun-Shik Lee

Affiliations

M J Paul: Department of Physics, Oregon State University , Corvallis, OR 97331, USA
Y C Chang: Center for Ultrafast Optical Science and Department of Electrical Engineering and Computer Science, University of Michigan , Ann Arbor, MI 48109, USA
Z J Thompson: Department of Physics, Oregon State University , Corvallis, OR 97331, USA
A Stickel: Department of Physics, Oregon State University , Corvallis, OR 97331, USA
J Wardini: Department of Physics, Oregon State University , Corvallis, OR 97331, USA
H Choi: School of Electrical and Electronic Engineering, Yonsei University , Seoul, Republic of Korea
E D Minot: Department of Physics, Oregon State University , Corvallis, OR 97331, USA
B Hou: Center for Ultrafast Optical Science and Department of Electrical Engineering and Computer Science, University of Michigan , Ann Arbor, MI 48109, USA
J A Nees: Center for Ultrafast Optical Science and Department of Electrical Engineering and Computer Science, University of Michigan , Ann Arbor, MI 48109, USA
T B Norris: Center for Ultrafast Optical Science and Department of Electrical Engineering and Computer Science, University of Michigan , Ann Arbor, MI 48109, USA
Yun-Shik Lee: Department of Physics, Oregon State University , Corvallis, OR 97331, USA

DOI: https://doi.org/10.1088/1367-2630/15/8/085019
Journal volume & issue: Vol. 15, no. 8
p. 085019

Abstract

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We investigate the response of multi-layer epitaxial graphene and chemical vapor deposition (CVD)-grown single-layer graphene to strong terahertz (THz) fields. Contrary to theoretical predictions of strong nonlinear response, the transmitted fields exhibit no harmonic generation, indicating that the nonlinear response is limited by fast electron thermalization due to carrier–carrier scattering. The fast electron heating gives rise to large THz transmission enhancement (> 15%) in single-layer CVD graphene at high THz fields ( E _THz > 10 kV cm ^−1 ). The nonlinear effects exhibit non-Drude behavior in the THz conductivity, where THz fields induce extreme non-equilibrium electron distributions.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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