Time: 14:00-15:30, Wednesday, May 20, 2026

Host: Prof. Jie Wu, Chair of Department of Physics, School of Science, Westlake University

Venue: Room E10-211, Yungu Campus, Westlake University

Lecture Language: English

Prof. Hai-Qing Lin

Professor of Zhejiang University，

Academician, CAS

Speaker：

Prof. Hai-Qing Lin obtained his PhD from the University of California, San Diego, in 1987. His then did postdoctoral works at Brookhaven National Laboratory (1987-1989) and Los Alamos National Laboratory (1989-1991). He was a research assistant professor in the University of Illinois at Urbana-Champaign (1991-1995). Then he joined the Chinese University of Hong Kong (1995-2010), moved to the Beijing Computational Science Research Center (2010-2022), and has been at Zhejiang University since 2022. Prof. Lin's research interests span condensed matter theory and computational physics, encompassing strongly correlated electron systems, surface plasmons, materials under high pressure, quantum entanglement and phase transitions, magnetism, superconductivity, many-body physics, and the development of numerical simulation techniques. His contributions to the development and application of computational methods to quantum many-body systems earned him election as an APS fellow in 2003 and as an academician of the Chinese Academy of Sciences in 2019.

Abstract:

In this talk, I report our research on superconductivity, especially our efforts on understanding the mechanism of high-temperature superconductivity in organic superconductors and cuprates. For organic superconductors, we carried out an extensive numerical study on the polycyclic aromatic hydrocarbon (PAH) superconductors, starting from C6H6 (single benzene ring) to C30H18 (seven benzene rings), and we predict the existence of a unique superconducting phase in aromatic hydrocarbons. Such phase came is electron-phonon originated with Tc in the range of 5-7K. To accommodate experimental findings and expectation for higher Tc, we argue that the electronic correlation should play an important role. We further show cases where one may achieve superconductivity in liquid nitrogen temperature zone at ambient pressure. We then report a universal relation between Tc and Coulomb interaction such as Hubbard U in cuprates. Mechanism behind the universal relation will be briefly discussed. Focus on the cuprates, we developed an extended interlayer coupling model for layered cuprate superconductors, adopting a widely accepted dispersion of electronic structure to address several common features of cuprates.

Contact:

School of Science, Ye Jin, Email: jinye@westlake.edu.cn