Abstract
I will present an overview of our recent studies on electronic transport in semiconductors by using optical techniques. We developed three ultrafast laser techniques for transport studies: a quantum interference and control technique that can instantaneously inject transient and ballistic charge and spin currents, a differential pump-probe technique that can resolve sub-nanometer transport, and a second-harmonic generation technique that can directly detect the velocity of carriers. We used various combinations of these techniques to study ballistic and diffusive transport in traditional three-dimensional semiconductors of silicon, germanium and gallium arsenide; two-dimensional nanomaterials of graphene and MoS2, and one-dimensional semiconducting carbon nanotubes.
Coffee and tea will be served 20 minutes prior to the seminar.