Electron-Phonon and Electron-Electron Interactions in Molecular Junctions
Given by: Dr. Lam Yu
National Institute of Standards & Technology (NIST)
Wednesday, February 27
4:00pm in Manning Hall room 201
Refreshments served in Manning Hall room 222 beginning at 3:30pm
A molecular junction, constructed by sandwiching a molecular layer between two metallic
electrodes, is a valuable tool in the study of nanoscale physics. By monitoring the
changes in the rate at which charge carriers traverse a molecular junction at different
bias potentials, much can be learned about the chemical structure and energetic landscape
of the molecular junction.
In this talk, I will describe how my quest to find out what exactly determines the
electrical transport characteristics of a molecular junction led me to the physics
of electron-phonon and electron-electron interactions and the realization that strongly
correlated electronic systems can be constructed from molecular components.
I will show that the electronic levels of a molecular device can be chemically modified
to induce higher-order electron-phonon scattering in the device resulting in substantial
changes in its transport characteristics, and that single-molecule devices can exhibit
the Kondo effect at surprisingly high temperatures (>50 K).