Speaker
Steven Johnson
(ETH Zürich)
Description
Materials with structural and electronic properties with reduced dimensionality are an important class that displays many interesting properties both in and out of equilibrium. In this talk I report on two recent studies on such systems. First, I describe an investigation of the coherent vibrational dynamics associated with the quasi-1D material K0.3MoO3, a charge density wave material. Here we observe an anomalous damping effect that appears under conditions where the ultrafast symmetry change in the interatomic potential occurs. The results demonstrate a novel means of coherent control of lattice dynamics by manipulating damping. I also report on recent XFEL experiments on the quasi-2D material Td-WTe2 that show clearly the ability to coherently modulate inter- and intra-planar vibrational modes that directly impact both the carrier properties and move the system toward another topological phase. These results indicate a possible new means of constructing ultrafast thin film devices with novel transport properties
Primary author
Steven Johnson
(ETH Zürich)
