Effect of band-gap tuning on absorption of phonons and acoustoelectric current in graphene nanoribbon
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Physica E: Low-dimensional Systems and Nanostructures
Abstract
We report the use of Boltzmann Transport Equation (BTE) in the hypersound regime for investigating the gen eration of acoustoelectric (AE) current in an armchair graphene nanoribbon (AGNR). The AE current obtained
was deduced from the absorption due to the Landau damping of quantized sound waves (LD-QSW) energy. By
stimulating the AGNR with a non-quantized electric field, the absorption and the AE current were analysed
against the frequency, the wavenumber, the width of the bandgap and the drift velocity. The absorption was
observed to switch to amplification as the drift velocity was varied. At high drift velocities, the amplitude of the
AE current decreases as the band-gap (that depends on the applied electric field) was increased, suggesting a
potential use of AGNR in the design of tunable acoustoelectric current devices.
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Research Article