Engineering Electronic States, Energy Transfer and Disorder in Nanomaterials Through the External Environment: Nano Seminar Series

Seminar | September 20 | 2-3 p.m. | 120 Latimer Hall

 Dr. Archana Raja, Staff Scientist, LBNL Molecular Foundry

 Berkeley Nanosciences and Nanoengineering Institute

There is a rich variety of nanostructures available today for the design of novel material systems and interfaces with tailor-made functionalities.

In particular, atomically thin two-dimensional materials such as graphene and transition metal dichalcogenide (TMDC) monolayers exhibit extraordinary optoelectronic properties, and can be assembled layer by layer into van der Waals heterostructures. For such materials, with thicknesses below a nanometer, I will show that the local environment strongly influences their electronic and excitonic states, corresponding disorder, dephasing processes and transport of energy. I will also briefly discuss the use of ultrafast electron diffraction to track thermal transport in van der Waals heterostructures.

The possibility to non-invasively engineer material properties and dynamics by tuning the local environment rather than the material itself yields a new paradigm for nanoscale devices and energy conversion processes.
Archana Raja did her PhD in Chemical Physics at Columbia and postdoc at Stanford. She then joined the Kavli ENSI here at UC Berkeley (Go Bears!) as a fellow in the Alivisatos group, and has just this year joined the LBNL Molecular Foundry as a Staff Scientist.