Evaluating arbitrary strain configurations and doping in graphene with Raman spectroscopy
Abstract
Raman spectroscopy is a powerful tool for characterizing the local properties of graphene. Here, we introduce a method for evaluating unknown strain configurations and simultaneous doping. It relies on separating the effects of hydrostatic strain (peak shift) and shear strain (peak splitting) on the Raman spectrum of graphene. The peak shifts from hydrostatic strain and doping are separated with a correlation analysis of the 2D and G frequencies. This enables us to obtain the local hydrostatic strain, shear strain and doping without any assumption on the strain configuration prior to the analysis. We demonstrate our approach for two model cases: Graphene under uniaxial stress on a PMMA substrate and graphene suspended on nanostructures that induce an unknown strain configuration. We measured for pure hydrostatic strain. Raman scattering with circular corotating polarization is ideal for analyzing strain and doping, especially for weak strain when the peak splitting by shear strain cannot be resolved.
Keywords
Cite
@article{arxiv.1703.09592,
title = {Evaluating arbitrary strain configurations and doping in graphene with Raman spectroscopy},
author = {Niclas S. Mueller and Sebastian Heeg and Miriam Peña Alvarez and Patryk Kusch and Sören Wasserroth and Nick Clark and Fred Schedin and John Parthenios and Konstantinos Papagelis and Costas Galiotis and Martin Kalbáč and Aravind Vijayaraghavan and Uwe Huebner and Roman Gorbachev and Otakar Frank and Stephanie Reich},
journal= {arXiv preprint arXiv:1703.09592},
year = {2017}
}