Issue |
EPL
Volume 107, Number 3, August 2014
|
|
---|---|---|
Article Number | 37007 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/107/37007 | |
Published online | 04 August 2014 |
Effect of asymmetry on nonlinear optical response in graphene
1 Department of Communication Science and Engineering, Fudan University - Shanghai 200433 China
2 School of Physics, University of Wollongong - New South Wales 2522, Australia
(a) whcao11@fudan.edu.cn
(b) ysa190@uowmail.edu.au
Received: 20 March 2014
Accepted: 17 July 2014
We show that a slight asymmetry in the wave function of graphene can result in a significant enhancement of the nonlinear effect on the optical response. The third-order nonlinear current due to asymmetry modification of the wave function increases with kFa, where kF is the Fermi eigenvector and a is the lattice constant. The effect of asymmetry can significantly enhance the third-order current at low temperature and at large Fermi energies. For kFa around 1, the nonlinear current increases by around 40% at low temperatures.
PACS: 73.50.Mx – High-frequency effects; plasma effects / 78.66.-w – Optical properties of specific thin films / 81.05.uf – Graphite
© EPLA, 2014
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