Spectroscopy for the Masses - of 2D Carbon Atoms

Monday, November 27, 2017 - 2:30pm

Several kinds of optical spectroscopy entered a new realm as carbon nanotubes and especially graphene became available. Optical spectroscopy is a window on the quantum world of Dirac cones, electron and hole transport, excitons, direct and indirect transitions, phonons, and new phenomena arising from 2 or more layers of graphene with control of the twisting overlay angle. The spectroscopy is weird, and even deceiving, as we will describe. The first round of explanations for the underlying physics have not been born out, and here we give quite different second generation theories behind absorption, Raman, and ultrafast pump-probe spectroscopies of these materials.

Location: 
3 Le Conte Hall
Speaker: 
Affiliation: 
Harvard University