Influence of external temperature gradient on acoustoelectric current in graphene
Dompreh, K. A. · Mensah, N. G. · Mensah, S. Y. · Edziah, R.
Original · EN
Recent analyses of thermoelectric amplification of acoustic phonons in Free-Standing Graphene (FSG) Γqgrap have prompted the theoretical study of the influence of external temperature gradient (∇ T) on the acoustoelectric current jₜ(grap) in FSG. Here, we calculated thermal field on open circuit (jₜ(grap) = 0) to be (∇ T)ᵍ = 746.8Km⁻¹. We then calculated acoustoelectric current (jₜ(grap))to be 1.1mAμm⁻² for ∇ T = 750.0 Km⁻¹, which is comparable to that obtained in semiconductors (1.0mAμm⁻²), the thermal-voltage (Vₜ)₀ᵍ to be 6.6μV and the Seebeck coefficient S as 8.8μV/K. Graphs of the normalized jₜ(grap)/j₀ versus ωq, T and ∇ T/T were sketched. For jₜ(grap) on T for varying ωq, Negative Difference Conductivity (NDC) (| ∂ j/∂ T| < 0) was observed in the material. This indicates graphene is a suitable material for developing thermal amplifiers and logic gates.
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