Electron-hole puddles in the absence of charged impurities

Marco Gibertini, Andrea Tomadin, Francisco Guinea, Mikhail I. Katsnelson, Marco Polini
2012 Physical Review B  
It is widely believed that carrier-density inhomogeneities ("electron-hole puddles") in single-layer graphene on a substrate like quartz are due to charged impurities located close to the graphene sheet. Here we demonstrate by using a Kohn-Sham-Dirac density-functional scheme that corrugations in a real sample are sufficient to determine electron-hole puddles on length scales that are larger than the spatial resolution of state-of-the-art scanning tunneling microscopy.
doi:10.1103/physrevb.85.201405 fatcat:ekwelkqndzdhjlzd25b5ezquvi