Influence of external temperature gradient on acoustoelectric current in graphene

2016/04/29 by K. A. Dompreh, N. G. Mensah, Dompreh, K. A. +5
Materials Science · #Advanced Thermoelectric Materials and Devices #FOS: Physical sciences #Graphene research and applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Thermal properties of materials

paper · pdf · doi:10.48550/arxiv.1604.08725

openalex publication_date 2016/04/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Recent analyses of thermoelectric amplification of acoustic phonons in Free-Standing Graphene (FSG) Γ_q^grap have prompted the theoretical study of the influence of external temperature gradient (∇ T) on the acoustoelectric current j_T^(grap) in FSG. Here, we calculated thermal field on open circuit (j_T^(grap) = 0) to be (∇ T)^g = 746.8Km^-1. We then calculated acoustoelectric current (j_T^(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 (V_T)₀^g to be 6.6μV and the Seebeck coefficient S as 8.8μV/K. Graphs of the normalized j_T^(grap)/j₀ versus ω_q, T and ∇ T/T were sketched. For j_T^(grap) on T for varying ω_q, 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.

Citations

• Acoustoelectric Effect in degenerate Carbon Nanotube
• Hypersound Absorption of Acoustic Phonons in a degenerate Carbon Nanotube

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• Acoustoelectric Effect in Graphene with degenerate Energy dispersion
• Temperature behavior of graphene conductance induced by piezoelectric effect in ferroelectric substrate
• The Acousto-Thermoelectric Effect
• Phonon Transport in Suspended Single Layer Graphene
• Thermal Transport in Graphene, Few-Layer Graphene and Graphene Nanoribbons