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Title: Acoustoelectric photoresponse in graphene

The acoustoelectric current in graphene has been investigated as a function of illumination, using blue (450 nm) and red (735 nm) light-emitting diodes (LEDs), and surface acoustic wave (SAW) intensity and frequency. The measured acoustoelectric current increases with illumination, more than the measured change in the conductivity of the graphene, whilst retaining a linear dependence on the SAW intensity. The latter is consistent with the interaction between the carriers and SAWs being described by a relatively simple classical relaxation model suggesting that the change in the acoustoelectric current is caused by the effect of the illumination on the electronic properties of the graphene. The increase in the acoustoelectric current is greatest under illumination with the blue LED, consistent with the creation of a hot electron distribution.
Authors:
; ;  [1]
  1. College of Engineering, Mathematics and Physical Sciences, University of Exeter, EX4 4QF Exeter (United Kingdom)
Publication Date:
OSTI Identifier:
22398832
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHARGE CARRIERS; ELECTRIC CONDUCTIVITY; ELECTRIC CURRENTS; ELECTRONIC STRUCTURE; ELECTRONS; GRAPHENE; ILLUMINANCE; LIGHT EMITTING DIODES; RELAXATION; SOUND WAVES; SURFACES