Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/6122
Title: Appearance of negative differential conductivity in graphene nanoribbons at high-harmonicsa)
Authors: Rabiu, M.
Mensah, S. Y.
Abukari, S. S.
Keywords: Current density
Bessel function
Bloch oscillations
Negative differential conductivity
Issue Date: 2012
Publisher: University of Cape Coast
Abstract: 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
Description: 6p:, ill.
URI: http://hdl.handle.net/123456789/6122
ISSN: 23105496
Appears in Collections:Department of Physics

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