Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/6115
Title: Amplification of hypersound in graphene with degenerate energy dispersion
Authors: Dompreh, K. A.
Mensah, N. G.
Mensah, S. Y.
Issue Date: 2015
Publisher: University of Cape Coast
Abstract: Hypersound amplification/absorption of acoustic phonons in Graphene with degenerate energy dispersion ε(p) near the Fermi level was theoretically studied. For kβT << 1 and ql >> 1, the dependence of the absorption coefficient Γ/Γ0 on VD Vs was studied where the results satisfied the Cerenkov effect. That is when VD Vs> 1, an amplification was obtained but for VD Vs < 1, an absorption was obtained which could lead to Acoustoelectric Effect (AE) in Graphene. A linear dependence of the Γ/Γ0 on ωq was observed where the result obtained qualitatively agreed with an experimentally observed acoustoelectric current in Graphene via the Weinrich relation. It is interesting to note from this study that, frequencies above 10T Hz can be attained for VD = 1.1ms−1. This study permit the use of Graphene as hypersound phonon laser (SASER
Description: 13p:, ill.
URI: http://hdl.handle.net/123456789/6115
ISSN: 23105496
Appears in Collections:Department of Physics

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