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

Details Appearance of Negative Differential Conductivity in Graphene Nanoribbons at High-Harmonics Appearance of Negative Differential Conductivity in Graphene Nanoribbons at High-Harmonics

2012-02-16

arxiv.org/abs/1202.3569v2

Physics

Condensed Matter

Materials Science

6 pages, 3 figures

Scientific paper

We theoretically study current dynamics of graphene nanoribbons subject to bias dc and ac driven fields. We showed that graphene nanoribbons exhibit negative high-harmonic differential conductivity. Negative differential conductivity appears when bias electric filed is in the neighborhood of applied ac filed amplitude. We also observe both even and odd high-harmonic negative differential conductivity 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.

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