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has been cited by the following article:

• TITLE: Appearance of Negative Differential Conductivity in Graphene Nanoribbons at High-Harmonics

  AUTHORS: Musah Rabiu, Samuel Y. Mensah, Sulemana S. Abukari

  KEYWORDS: Graphene Nanoribbon; Energy Spectrum; Electronic Conductivity; Terahertz; Negative Differential Conductivity

  JOURNAL NAME: Graphene, Vol.2 No.2, April 30, 2013

  ABSTRACT: We theoretically study current dynamics of graphene nanoribbons subject to DC-AC driven fields. We show that graphene exhibits negative differential conductivity (NDC) at high-harmonics. NDC occurs in the neighborhood where a constant electric field is equal to amplitude of ac field. We also observe NDC at both even and odd harmonics and at wave mixing of two commensurate frequencies. The even harmonics are more pronounced than the odd harmonics. A possible use of the present method for generating terahertz frequencies at even harmonics in graphene is suggested.