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Browsing Department of Physics by Author "Abukari, S. S."

Browsing Department of Physics by Author "Abukari, S. S."

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  • Amplification of acoustic waves in armchair graphene nanoribbon in the presence of external electric and magnetic field 
    Dompreh, K. A.; Mensah, S. Y.; Abukari, S. S.; Sam, F.; Mensah, N. G. (University of Cape Coast, 2015)
    Amplification of Acoustic Waves in Armchair Graphene Nanoribbon (AGNR) in the presence of an external Electric and Magnetic field was studied using the Boltzmann’s kinetic equation. The general expression for the Amplification ...
  • Anomalous viscosity of vortex hall states in graphenea) 
    Rabiu, M.; Mensah, S. Y.; Ibrahim, S. Y.; Abukari, S. S. (University of Cape Coast, 2015)
    We study temperature effect on anomalous viscosity of Graphene Hall fluid within quantum many vortex hydrodynamics. The commonly observed filling fractions, ν in the range 0 < ν < 2 is considered. An expression for anomalous ...
  • Appearance of negative differential conductivity in graphene nanoribbons at high-harmonicsa) 
    Rabiu, M.; Mensah, S. Y.; Abukari, S. S. (University of Cape Coast, 2012)
    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 ...
  • Behaviour of hot electrons under the dc field in chiral carbon nanotubes 
    Amekpewu, M.; Dompreh, K. A.; Mensah, S. Y.; Mensah, N. G.; Abukari, S. S.; Musah, R.; Twum, A.; Edziah, R. (University of Cape Coast, 2016)
    Behaviour of hot electrons under the influence of dc field in carbon nanotubes is theoretically considered. The study was done semi-classically by solving Boltzmann transport equation with the presence of the hot electrons ...
  • Direct current generation due to wave mixing in zigzag carbon nanotubes 
    Abukari, S. S.; Mensah, S.Y.; Mensah, N. G.; Dompreh, K. A.; Twum, A.; Allotey, F. K. A. (University of Cape Coast, 2000)
    Generation of direct current in zigzag carbon nanotubes due to harmonic mixing of two coherent electromagnetic waves is being considered. The electromagnetic waves have commensurate frequencies of Ω and Ω. The rectification ...
  • Effect of laser on thermopower of chiral carbon nanotube 
    Mensah, S.Y.; Twum, A.; Mensah, N. G.; Dompreh, K. A.; Abukari, S. S.; Nkrumah-Buandoh, G (University of Cape Coast, 2000)
    An investigation of laser stimulated thermopower in chiral CNT is presented. The thermopower of a chiral CNT is calculated using a tractable analytical approach. This is done by solving the Boltzman kinetic equation with ...
  • General scattering mechanism and transport in graphene 
    Rabiu, M.; Mensah, S. Y.; Abukari, S. S. (University of Cape Coast, 2011)
    Using quasi-time dependent semi-classical transport theory in RTA, we obtained coupled current equations in the presence of time varying field and based on general scattering mechanism τ ∝ Eβ .We find that close to the ...
  • Generation of terahertz radiation by wave mixing in armchair carbon nanotubes 
    Mensah, S.Y.; Abukari, S. S.; Mensah, N. G.; Dompreh, K. A.; Twum, A.; Allotey, F. K. A. (University of Cape Coast, 2000)
    Using semiclassical Boltzmann equation we have studied theoretically an effect of a direct current (DC) generation in undoped armchair carbon nanotube (CN) by mixing two coherent electromagnetic waves with commensurate ...
  • High frequency conductivity in carbon nanotubes 
    Abukari, S. S.; Mensah, S. Y.; Mensah, N. G.; Adu, K. A.; Rabiu, M.; Twum, A. (University of Cape Coast, 2012-12-05)
    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 ...
  • High frequency conductivity in carbon nanotubes 
    Abukari, S. S.; Mensah, S. Y.; Mensah, N. G.; Adu, K. A.; Rabiu, M.; Twum, A. (University of Cape Coast, 2012-12-05)
    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 ...
  • High frequency conductivity of hot electrons in carbon nanotubes 
    Amekpewua, M.; Mensah, S. Y.; Musah, R.; Mensah, N. G.; Abukari, S. S.; Dompreh, K. A. (University of Cape Coast, 2015)
    High frequency conductivity of hot electrons in undoped single walled achiral carbon nanotubes (CNTs) under the influence of ac-dc driven fields is considered. We investigated semi classically by solving the Boltzmann’s ...
  • Hot electrons injection in carbon nanotubes under the influence of quasi-static ac-field 
    Amekpewu, M.; Mensah, S. Y.; Musaha, R.; Mensah, N. G.; Abukari, S. S.; Dompreh, K. A. (University of Cape Coast, 2015)
    Hot electrons injection in carbon nanotubes (CNTs ) where in addition to applied dc field (E), there exist simultaneously a quasi-static ac electric field (i.e. when the frequency ω of ac field is much less than the ...
  • Hydrodynamic study of edge spin-vortex excitations of fractional quantum hall fluid 
    Rabiu, M.; Mensah, S. Y.; Seini, I. Y.; Abukari, S. S. (University of Cape Coast, 2018)
    We undertake a theoretical study of edge spin-vortex excitations in fractional quantum Hall fluid. This is done in view of quantised Euler hydrodynamics theory. The dispersions of true excitations for fractions within 0 ≤ ...
  • Hypersound absorption of acoustic phonons in a degenerate carbon nanotube 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y.; Abukari, S. S.; Sam, F.; Edziah, R. (University of Cape Coast, 2015)
    Absorption of acoustic phonons was studied in degenerate Carbon Nanotube (i.e. where the electrons are found close to the Fermi level). The calculation of the hypersound absorption coefficient (Γ) was done in the regime ...
  • Magnetoplasmon excitations at graphene ortex hall fluid edge 
    Rabiu, M.; Mensah, S. Y.; Seini, I. Y.; Abukari, S. S. (University of Cape Coast, 2015)
    We investigate magnetoplasmon dynamics localized on the edges of graphene ortex Hall fluid. The ortex matter captures an anomalous term that causes ortex localization near fluid boundary and creates a double boundary ...
  • Negative differential conductivity in carbon nanotubes in the presence of an external electric field 
    Abukari, S. S.; Mensah, S.Y.; Mensah, N. G.; Adu, K.W.; Dompreh, K. A.; Twum, A. K. (University of Cape Coast, 2000)
    We study theoretically the electron transport properties in carbon nanotubes under the influence of an external electric field () using Boltzmann’s equation. The current-density equation is derived. Negative differential ...
  • Negative high-harmonic differential conductivity in graphene nanoribbons 
    Rabiu, M.; Mensah, S. Y.; Abukari, S. S. (University of Cape Coast, 2012)
    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 ...

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