M. Rabiu, S. Y. Mensah, S. S. Abukari
We theoretically study current dynamics of graphene nanoribbons subject to
bias 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 terahartz frequencies at even harmonics in
graphene is suggested.
View original:
http://arxiv.org/abs/1202.3569
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