The ordinary scanning tunneling microscopy image of a carbon dot on the left shows only a featureless dot. The time-resolved single molecule absorption STM on the right reveals that laser excitation is initially spread over the whole carbon dot, but within a few picoseconds the excitation migrates to a highly localized area on the surface. The white scale bar is 5 nanometers long. | Graphic courtesy Martin Gruebele


To reach Martin Gruebele, call 217-333-1624; email

The paper “Ultrafast nanometric imaging of energy flow within and between single carbon dots” is available from the U. of I. News Bureau. DOI: 10.1073/pnas.2023083118.