Pennsylvania State University

Abstract：

Electronic phase transitions such as insulator-metal transitions in correlated materials are a core subject in condensed matter and materials science and have many revolutionary potential applications in information technology. These device applications often depend on mesoscopic nonequilibrium, inhomogeneous processes of the insulator-metal transitions and their coupled multi-physics fields, which require theoretical understanding for both fundamental knowledge and performance improvement. However, it is tough for quantum schemes to simulate such processes in real correlated materials. Here, I developed a continuum phenomenological framework that circumvents the quantum detail and can efficiently simulate such processes. I used the framework to (1) uncover the sublattice-dependent antiferromagnetic transitions in perovskite nickelates and elucidate the mechanism of the experimentally observed collective resistive switching in gated VO2 thin films relevant to Mott field-effect transistors; (2) guide neuromorphic computing applications of artificial synapses and neurons based on perovskite nickelates and VO2; (3) predict the emergence of nonequilibrium charge density waves during ultrafast excitations of insulator-metal transitions. I will also briefly discuss my recent microscopic studies of non-Fermi liquid transport and superconductivity in correlated electron systems.

Brief CV of Dr. Yin Shi:

Yin Shi is an assistant research professor at Pennsylvania State University. He obtained his B.S. in physics from Peking University in 2014 and then earned his Ph.D. in materials science and engineering from Pennsylvania State University in 2020 under the supervision of Prof. Long-Qing Chen. He investigated topological insulators using the density functional theory during his undergraduate study and has been focusing on modeling mesoscopic electronic phase transitions in correlated materials since his graduate study. He is also interested in microscopic theories of correlated electron systems. He is always fascinated by the emergence of magical and useful collective phenomena from interacting electrons. He published 13 (co)first-authored papers, including two in Physical Review Letters and one in Advanced Materials, and eight collaborative papers with experimental groups, including two in Science, one in PNAS, and one in Physical Review Letters (Featured in Physics, Editors’ Suggestion). He received the Robert E. Newnham Award for Research Excellence in 2019 from the Department of Materials Science and Engineering at Pennsylvania State University and the Allocation Year 2024, 2025 DOE Mission Science Award from the U.S. National Energy Research Scientific Computing Center.

腾讯会议ID：416-159-598

会议密码：0220

主持人：刘淼  研究员

联系人：傅琦（82649469）