Dr. Jianfeng Zhang [Institute of physics, CAS]

Title: Exploring superconducting materials by first-principles calculation

Language:  English presentation

Time: 13:00 - 14:00, November 11, 2024

Place:  Onsite：Conference room A417, HPSTAR (Beijing) 

           Online:  Tencent Meeting: https://meeting.tencent.com/dm/gLvK9YWEqS23  Meeting ID: 594-531-445

Host:  Dr. Yang Ding

Abstract:

Superconductivity is a low-energy condensed matter. The superconducting Tc of materials strongly correlated their electronic states around the Fermi level. This necessitates the use of first-principles calculations to provide a fundamental insight into their electronic structure. Generally, superconductivity can exhibit a competitive/coexistent relation with other material phases, such as the structure phase, charge/spin order, electronic transport, topological bands, or others. My early works focus on studying these relationships through first-principles calculation, to understand their superconducting mechanisms or to identify a path to higher superconducting Tc. This also underpins my current work: seeking an effective indicator for high superconducting Tc, named “metallized sigma bond”.In my report, I will first introduce several material systems in my earlier works, all of which involve pressure-modulated superconductivity. I will then demonstrate how the metallized sigma bond can serve as an effective indicator for high superconducting Tc by discussing some typical high-Tc superconductors. Finally, to explore novel high-Tc superconductors using this relationship, I will briefly present my initial attempts in this area.

Biography of the Speaker:

Jian-Feng Zhang received his B.S. degree at Renmin University of China in 2015 and continued his study at same institution, earning his Ph.D. degree in 2021. Currently, he is conducting in postdoctoral research (working with Prof. Tao Xiang) at the Institute of Physics, Chinese Academy of Sciences. His researches primarily focus on using first-principles calculation to explore various matter phase transitions in materials, including superconductivity, electronic transport, topological band, and so on. His research has received support from the China Postdoctoral Science Foundation and the National Natural Science Foundation of China. To date, Zhang has published 33 articles in renowned SCI journals, serving as the first author on 7 papers, corresponding author on 2, and co-first author on 8 papers.