Non-equilibrium and relaxation phenomena in graphene-based devices

Lead Research Organisation: University of Exeter
Department Name: Physics

Abstract

Graphene (a single atomic layer of graphite) first experimentally isolated and identified only four years ago, is rapidly revealing its great potential as an important material for future electronic devices. In order to progress towards realistic device applications of graphene, it is important to address the issues which will affect the operation of graphene in real circuits, where high currents will lead to overheating and non-equilibrium charge carrier distributions. The proposed joint project will launch an internationally leading programme involving three research groups which are already well established in graphene research and have expertise in complimentary areas. By combining fabrication technology of graphene-based devices, transport and optical studies, and theoretical modelling, we will investigate the kinetic properties of charge carriers and phonons (lattice vibrations) in graphene over a broad range of operating voltages, temperatures and optical intensities, with the aim to establish and improve the operating characteristics of graphene-based electronic and optoelectronic devices.

Publications

10 25 50
publication icon
Alexeev E (2013) Photo-induced doping and strain in exfoliated graphene in Applied Physics Letters

publication icon
Beckerleg C (2018) Cavity enhanced third harmonic generation in graphene in Applied Physics Letters

publication icon
Beckerleg C (2016) Localized plasmons induced by spatial conductivity modulation in graphene in Journal of the Optical Society of America B

publication icon
Constant T (2015) All-optical generation of surface plasmons in graphene in Nature Physics

publication icon
Constant TJ (2017) Intensity dependences of the nonlinear optical excitation of plasmons in graphene. in Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

publication icon
Hendry E (2010) Coherent nonlinear optical response of graphene. in Physical review letters

 
Description We found that graphene is remarkably robust to very high electronic temperatures, a property which is enabled by extremely efficient energy relaxation mechanisms. This has enabled the development of high current graphene devices within our own group and others. In contrast, we have also found that the transport and optical properties of graphene are rincreadibly sensitive to environment - we have obtained further funded to investigate this property further, with a view to developing chemical sensors.
Exploitation Route Arguably our most important finding during this project lies in graphene's exceptionally high optical nonlinearity under intense illumination. This has led to a spate of theoretical studies which have shown that, due to this exceptional property, single photon nonlinearities may be possible in graphene. There is now a strong push amongst the graphene community to demonstrate this effect, and this is something we ourselves are aiming to achieve as part our ERC funded FET network, GRASP.
Sectors Electronics,Pharmaceuticals and Medical Biotechnology

URL http://www.grasp-fet.eu/
 
Description By combining manufacturing technology of graphene-based devices, transport and optical studies, we elucidated the kinetic properties of charge carriers and phonons in graphene over a broad range of operating voltages, temperatures and optical intensities. This knowledge is essential for graphene devices operating in real circuits, where high currents will lead to overheating and non-equilibrium charge carrier distributions. Probably our most important finding during this project lies in graphene's exceptionally high optical nonlinearity under intense illumination. This has led to the initiation of an ERC funded FET network, GRASP, aimed at pushing the optical nonlinearity to the single photon limit.
First Year Of Impact 2010
Sector Electronics
 
Description FP7 FET grant
Amount € 395,000 (EUR)
Organisation European Research Council (ERC) 
Sector Public
Country European Union (EU)
Start 01/2014 
End 01/2017
 
Description Royal Society of London
Amount £14,000 (GBP)
Funding ID Royal Society research grant (RG110585) 
Organisation The Royal Society 
Sector Academic/University
Country United Kingdom
Start 01/2012 
End 01/2015
 
Description Royal Society of London
Amount £14,000 (GBP)
Funding ID Royal Society research grant (RG110585) 
Organisation The Royal Society 
Sector Academic/University
Country United Kingdom
Start 01/2012 
End 01/2015
 
Description University of Exeter
Amount £1,000 (GBP)
Funding ID Exeter Open Innovation Platform Link Fund 
Organisation University of Exeter 
Sector Academic/University
Country United Kingdom
Start 01/2012 
End 01/2012
 
Description University of Exeter
Amount £10,000 (GBP)
Funding ID Knowledge Escalator - Proof of Concept Award 
Organisation University of Exeter 
Sector Academic/University
Country United Kingdom
Start 01/2010 
End 01/2013