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https://hasegawa.issp.u-tokyo.ac.jp/nanosci-seminar-251023

Short Biography:
Ying-Shuang Fu is a physics professor affiliated with Huazhong University of Science and Technology in China. He earned his Ph.D. from the Institute of Physics, Chinese Academy of Sciences in 2008. From 2008 to 2014, he worked as a postdoctoral researcher at Hamburg University and RIKEN, respectively. Since 2014, he has been a professor in the School of Physics at Huazhong University of Science and Technology. He has focused on the study of correlated states in low-dimensional quantum systems using molecular beam epitaxy and spectroscopic- imaging scanning tunneling microscopy under ultralow-temperature and high-magnetic-field conditions. During the recent five years, he has published 36 papers as a corresponding author, including Phys. Rev. Lett. (1), Phys. Rev. X (1), PNAS (1), Nat. Commun. (7), JACS (5), etc.

Abstract:
Polarons are composite quasiparticles comprising an excess electron or hole surrounded by local lattice distortions—an effect driven by anti-adiabatic displacements of adjacent ions arising from strong electron-phonon coupling. These quasiparticles play a pivotal role in a broad range of physicochemical processes, influencing charge transport, superconductivity, colossal magnetoresistance, surface reactivity, thermoelectricity and multiferroicity, among others. Traditionally, polarons have been studied using ensemble-averaged techniques. Investigating single polarons at the atomic scale is critical to unraveling the correlated electron-phonon mechanisms underlying polaron formation, which however remains a longstanding challenge. In this talk, I will present our recent research on the discovery and manipulation of individual polarons in monolayer atomic and molecular crystals. Our works encompass single polarons and multipolarons, and have identified several novel polaron types, including van der Waals polarons in Sb₂O₃, spin-flip polarons in MnTe, and Jahn-Teller polarons in molecular magnet. Additionally, we have leveraged polaron manipulation to uncover new correlated states, including a Hubbard-type Coulomb blockade effect and a phason-polaron effect in one-dimensional nanowires. Our studies open a new avenue for exploring polarons and are expected to inspire efforts to harness polaron behavior for tailoring diverse physicochemical processes.