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

Xiaobin Xu | Zendy; S. Sultan | Zendy; Chao Zhang | Zendy; Jia-He Cao | Zendy

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

Author(s) -

Xiaobin Xu,

S. Sultan,

Chao Zhang,

Jia-He Cao

Publication year - 2010

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3462972

Subject(s) - terahertz radiation , graphene , conductance , electric field , nonlinear system , infrared , condensed matter physics , optoelectronics , materials science , physics , optics , nanotechnology , quantum mechanics

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. © 2010 American Institute of Physics.

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