Speaker: Zhi-Feng Huang (Wayne State University)

Time: 10:00-11:00 a.m., May 5, 2023, GMT+8

Venue: Tecent Meeting ID:366755345 Password:123123

Abstract:

One of the long-lasting challenges in the study of advanced materials is how to effectively tackle the vast complexity of the system that is of nonequilibrium nature and involves multiple spatial and temporal scales. Of particular importance is the bridging between material microscopic details and mesoscopic structures or patterns, for which much of recent theoretical effort has been devoted to the development of novel density-field based approaches across multiple scales. In this talk I will discuss some of our recent studies in this field for the modeling of material microstructures, dynamics, and elasticity/plasticity through the development of phase field crystal (PFC) method, as well as some ongoing challenges. Sample topics include the structures and collective dynamics of topological defects (dislocations and grain boundaries) in graphene-type 2D materials such as hBNN, grain rotation and normal- tangential coupled motion beyond the Cahn-Taylor mechanism as a result of inversion symmetry breaking, and novel structural properties in both vertically stacked and laterally grown heterostructures, such as the emergence of Moiré patterns and a misorientation-induced pattern transition in graphene/hBN twisted bilayers, and the formation of lateral multijunctions and superlattices during edge epitaxy of ternary 2D hexagonal materials like transition metal dichalcogenides.

Biography:

Zhi-Feng Huang is a professor of Physics at Wayne State University, working in the area oftheoretical and computational condensed matter physics and multiscale modeling of solid and soft complex materials and active matter. He obtained his B.Sc. and Ph.D. degrees in Physics from Tsinghua University, China, and after some postdoctoral positions in Germany, U.S.,and Canada,joined Wayne State Physics Department in 2006. He was a recipient of the U.S. National Science Foundation CAREER Award and the Wayne State Career Development Chair Award.

Source: School of Physics