Ultrafast Optical Control of Quantum Materials by Edbert Sie (Stanford University)

Monday, March 18, 2019 - 1:00pm to 2:00pm
Condensed Matter Physics Journal Club

A primary goal of modern condensed matter physics is to realize and control novel phases of quantum matter. Although many approaches using material synthesis and static fields have been used at thermal equilibrium, there exists a vast unexplored landscape and associated symmetries at non-equilibrium. Here we can use light to introduce new space-time symmetries in materials and realize new quantum phenomena that were previously inaccessible. In this talk, I will discuss how terahertz light pulses can be used to switch the inversion lattice symmetry and induce a topological phase transition in the Weyl semimetal WTe2. The optically-induced change of lattice structure is crystallographically probed using time-resolved electron diffraction at the atomic, sub-picometer length scale. This approach offers non-equilibrium pathways to control quantum properties of matter in the ultrafast timescales.


Brief Bio: Edbert Sie is currently a Postdoctoral Geballe Fellow at Stanford University, in the group of Prof. Aaron Lindenberg. He received his PhD in Physics in 2017 at the Massachusetts Institute of Technology (MIT), under the supervision of Prof. Nuh Gedik. His research interests focus on engineering novel phases of quantum materials with light at the atomic length scale and on femtosecond time scale. He is a recipient of the APS Richard L. Green Dissertation Award in Experimental Condensed Matter Physics (2019), Springer Nature Thesis Award (2017), and Stanford GLAM Fellowship (2017).

PAB 4-330