报告题目：Quantum-Geometry-Induced anomalous Hall Effect in Nonunitary Superconductors and Application to Sr2RuO4
报告人：张嘉龙，高级研究助理，香港大学
时 间：2025年4月3日下午2:30
地 点：粤海校区致原楼1007室
报告摘要:
The polar Kerr effect and the closely related anomalous charge Hall effect are among the most distinguishing signatures of some unconventional superconductors such as Sr2RuO4. These effects are often thought to be derived from chiral superconducting pairing and different mechanisms have been invoked for the explanation. However, the intrinsic mechanisms proposed previously often involve unrealistically strong interband Cooper pairing. In this talk I will show that, even without interband pairing, nonunitary superconducting states can support intrinsic anomalous charge Hall effect, thanks to the quantum geometric properties of the Bloch electrons. Applying our results to the weakly-paired Sr2RuO4 we conclude that, if the reported Kerr effect is of intrinsic origin, the superconducting state is most likely nonunitary and has odd-parity.
报告人简介:
Dr. Jia-Long Zhang obtained both his Bachelor Degree and Master Degree from Sun Yat-sen University. He received his Ph. D degree from Kavli Institute for Theoretical Sciences, UCAS in 2021. From 2022 to 2024 he worked as a Visiting Scholar at the Hong Kong University of Science and Technology. Then he joined Prof. Shen-Qing Shen’s group as a Senior Research Associate at the University of Hong Kong. His main research area includes unconventional superconductivity, topological states of matters and strongly-correlated many body system.
