Location: SC L160
Join Yale Chemistry for a Physical Chemistry Seminar with Wei Xiong, Professor at the University of California, San Diego.
Abstract: Molecular vibrational polaritons are hybrid half-light, half-matter quasiparticle under vibrational strong coupling. These hybrid quasiparticles not only inherit properties of both photons and matter, but also processes unique new photonic and molecular phenomena, including tilting chemical potential landscapes of reactions, adding new energy transfer pathways and strong photonic interactions. Many of these developments hinge on the fundamental understanding of the physical properties of molecular vibrational polaritons. Pump-probe and 2D IR spectroscopy provide unique insights to this emerging research area by resolving the dynamics of various states. In this talk, I will first cover the concept of vibrational strong coupling and the current understanding of polaritonic 2D IR spectra. Then I will discuss how polariton could influence inter and intramolecular interactions, including energy transfer between molecules and barrier crossing events. Lastly, I will show some exciting opportunities of using vibrational polaritons as quantum bits for quantum information technology, including coherent transfer among polaritons and confinement effects in polaritons, visualized by 2D IR imaging technique.
About: Professor Wei Xiong is a Professor and Kent Wilson Faculty Scholar in the Department of Chemistry and Biochemistry at the University of California, San Diego. Wei received his B.S. degree from Peking University, China, in 2006. He then joined Prof. Martin Zanni’s group at the University of Wisconsin, Madison, and completed his Ph.D. degree in 2011. At Madison, Wei focused on developing novel 2D vibrational spectroscopy (transient 2D IR and heterodyne 2D SFG spectroscopy) to study molecules on solid-state material surfaces. Wei then moved to the University of Colorado, Boulder, in 2011, where he worked with Prof. Margaret Murnane and Henry Kapteyn to develop the table-top XUV source for ultrafast measurements and time-resolved photoelectron spectroscopy for nanoparticles. He joined the faculty at the University of California San Diego in 2014. At UCSD, Wei’s group focuses on using and developing ultrafast nonlinear spectroscopic and imaging tools to reveal molecular structures and dynamics of materials, including ultrafast dynamics of polaritonic systems, guest molecule adsorptions on porous materials, femtosecond charge transfer dynamics on organic material interfaces. His work has been recognized by several awards including, DARPA Young Faculty Award, AFOSR Young Investigator Award, NSF CAREER Award, Sloan Foundation Fellowship, and JPC Lectureship Award.
This seminar is generously sponsored by the Mrs. Hepsa Ely Silliman Memorial Fund