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Browsing Department of Physics by Author "Allotey, F.K.A."

Browsing Department of Physics by Author "Allotey, F.K.A."

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  • Amplification of acoustic phonons in a degenerate semiconductor superlattices 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Eloh, V.W. (University of Cape Coast, 2002)
    Amplification of acoustic phonons propagating along the axis of a semiconductor superlattice (SL) is investigated using the microscopic theory. A non-quantizing electric field is applied to the S to produce a drift velocity ...
  • Differential thermo power of a chiral carbon nanotube 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah G., N.G.; Nkrumah, G (2000)
    Differential thermo power of a chiral carbon nanotube (CNT) was calculated using a tractable analytical approach. We obtained an expression for the electrical conductivity and the thermo power. The results were numerically ...
  • Electronic properties of single-walled chiral carbon nanotube electronic properties of single-walled chiral carbon nanotube 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Nkrumah, G. (University of Cape Coast, 2001)
    The electronic properties of single-walled chiral carbon nanotube has been studied using the model based on infinitely long carbon atoms wrapped along a base helix of single-walled carbon nanotubes(SWNTs). The problem is ...
  • Giant electrical power factor in single-walled chiral carbon nanotube 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Nkrumah, G. (University of Cape Coast, 2001)
    Using the semiclassical approach we studied the thermoelectrical properties of a single-walled chiral carbon nanotubes (SWNTs). We predict a giant electrical power factor and hence proposed the use of carbon nanotubes as ...
  • High electron thermal conductivity of chiral carbon nanotubes 
    Mensah, S.Y.; Allotey, F.K.A.; Nkrumah, George; Mensah, N.G. (University of Cape Coast, 2003)
    Solving the Boltzmann kinetic equation with energy dispersion relation obtained in the tight binding approximation, the carrier thermal conductivity Ke of a chiral carbon nanotube (CCNT) was determined. The dependence of ...
  • The influence of external electric field on acoustoelectric effect in a superlattice 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Akrobotu, H.; Nkrumah, G. (University of Cape Coast, 2003)
    The dc acoustoelectric current J" induced by the interaction of acoustic phonons with the conducting electrons is calculated. The calculation is done in the hypersound regime where q > I (here q is the acoustic phonon ...
  • Interaction of kink-lattice solitons with small-amplitude waves in finite-size superlattices 
    Mensah, S.Y.; Dikande, A.M.; Allotey, F.K.A.; Mensah, N.G. (University of Cape Coast, 1999-09)
    Propagation of large-amplitude electromagnetic fields and their interactions with small-amplitude waves in finite superlattices are considered in the framework of the sine-Gordon theory. Finite-size effects result in ...
  • Propagation of ultrasonic waves in bulk gallium nitride (gan) semiconductor in the presence of high-frequency electric field 
    Mensah, S.Y.; Mensah, N.G.; Elloh, V.W.; Banini, G.K.; Sam, Frederick; Allotey, F.K.A. (University of Cape Coast, 2005)
    The propagation of ultrasound is studied in bulk GaN semiconductor in the presence of a strong, ac field oscillating at a frequency much higher than that of the ultrasound. Analytical expressions have been obtained for the ...
  • Soliton excitation in superlattice 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Twum, A.K. (University of Cape Coast, 1995-10)
    Excitation of soliton in superlattice has been investigated theoretically. It is noted that the soliton velocity u and the length L depend on the amplitude Eo and that an increase in the amplitude causes soliton width L ...

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