Our Research


The Xiong group aims to controlling and understanding how structures and ultrafast dynamics of molecules and materials change when they couple to chemical environments, to each other and to photonic cavities. By learning the structures and dynamics, we will be able to connect it back to the functions and macroscopic properties of these materials. To achieve this goal, we push the frontier of ultrafast optical techniques by developing methods that can track dynamics in frequency, time and spatial domains, as well as implementing new light sources such as extreme ultraviolet (EUV) to gain element specificities. Several scientific areas of current interests are: polariton chemistry, soft material tissues, metal-organic-frameworks, charge transfer interfaces, and element specific charge dynamics on solid surfaces.

Wei and group members in the lab
Wei holding the cavity optics
Photo of transient XUV setup
Wenfan working on transient XUV setup
Schematic of transient XUV setup
Schematic of transient VSFG imaging
Artistic rendering of Polaritons
Picture of polariton samples
Mechanisms of polariton mediated hot vibrational modes populations
Mechanisms of Polariton mediated intermolecualr vibrational energy transfer
Journal Cover on Polaritons
Schematic of hyperspectral imaging and the spatial, temporal and spectral information can be revealed
Transient XUV spectra due to polaron formation
Photo of transient VSFG microscope
Schematic of 2D IR spectroscopy for polaritons
Schematic of 2D IR imaging system