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Electron-Phonon and Electron-Electron Interactions in Molecular Junctions

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

Abstract:

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).

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