Abstract
We use first-principles density-functional theory to determine the adiabatic frequency shift of the and phonons in a monolayer graphene as a function of both electron and hole doping. Compared to the results for the phonon (Raman band), the results for the phonon are dramatically different, while those for the phonon are not so different. Furthermore, we calculate the frequency shifts, as a function of the charge doping of the phonons responsible for the Raman 2D band—a key fingerprint of graphene, where is determined by the double-resonance Raman process.
- Received 14 August 2007
DOI:https://doi.org/10.1103/PhysRevB.76.201404
©2007 American Physical Society