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High frequency conductivity in carbon nanotubes

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dc.contributor.author Abukari, S. S.
dc.contributor.author Mensah, S. Y.
dc.contributor.author Mensah, N. G.
dc.contributor.author Adu, K. A.
dc.contributor.author Rabiu, M.
dc.contributor.author Twum, A.
dc.date.accessioned 2021-10-12T10:16:39Z
dc.date.available 2021-10-12T10:16:39Z
dc.date.issued 2012-12-05
dc.identifier.issn 23105496
dc.identifier.uri http://hdl.handle.net/123456789/6203
dc.description 6p:, ill. en_US
dc.description.abstract We report on theoretical analysis of high frequency conductivity in carbon nanotubes. Using the kinetic equation with constant relaxation time, an analytical expression for the complex conductivity is obtained. The real part of the complex conductivity is initially negative at zero frequency and become more negative with increasing frequency, until it reaches a resonance minimum at ω ∼ ωB for metallic zigzag CNs and ω<ωB for armchair CNs. This resonance enhancement is indicative for terahertz gain without the formation of current instabilities induced by negative dc conductivity. We noted that due to the high density of states of conduction electrons in metallic zigzag carbon nanotubes and the specific dispersion law inherent in hexagonal crystalline structure result in a uniquely high frequency conductivity than the corresponding values for metallic armchair carbon nanotubes. We suggest that this phenomenon can be used to suppress current instabilities that are normally associated with a negative dc differential conductivity en_US
dc.language.iso en en_US
dc.publisher University of Cape Coast en_US
dc.title High frequency conductivity in carbon nanotubes en_US
dc.type Article en_US


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