Nonlinear optical conductance in a graphene pn junction in the terahertz regime

Authors

X.G Xu, Shanghai Institute
S Sultan, Engineering Physics UOWFollow
Chao Zhang, University of WollongongFollow
J.C Cao, Shanghai Institute

RIS ID

33078

Publication Details

Sultan, S., Cao, J., Xu, X. and Zhang, C. (2010). Nonlinear optical conductance in a graphene pn junction in the terahertz regime. Applied Physics Letters, 97 (1), 011907-1-011907-3.

Abstract

We show that the optical responses of a graphene pn junction is dominated by nonlinear intraband and interband processes. At the experimentally relevant electric field intensity, nonlinear conductance is an order of magnitude larger than the linear conductance. Furthermore, the total conductance is negative in the terahertz to far infrared regime. The negative conductance provides a unique mechanism for photon generation in graphene and could be used for developing coherent terahertz radiation sources.