Resonant Structure of Second Harmonic Generation in Multilayer Graphene Polytypes
Abstract
Second harmonic generation (SHG) is a powerful optical tool for identifying noncentrosymmetric crystalline structures. Here, we analyze SHG in multilayer graphenes (MLG), with a focus on its dependence on the stacking order, encapsulation environment, and biasing that break inversion symmetry in multilayers, as well as the SHG sensitivity to the electron-hole asymmetry in the MLG spectra and doping. In particular, we identify stacking-order-dependent resonant features in the SHG spectra for trilayers and tetralayers, suggesting that infrared-range SHG offers a noninvasive characterization method for distinguishing between MLG polytypes, as well as optical identification of crystallographic direction in MLG films.
Fields of Study & Subjects
Plasmonic and Surface Plasmon Research
Graphene research and applications
Terahertz technology and applications
Publication details
- Journal / source
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Volume
- 26
- Issue
- 30
- Pages
- 9766–9773
- Publication date
- 21 July 2026
- Language
- EN