报告人简介：

Hiroki Ikegami is a professor at Institute of Physics (IOP), Chinese Academy of Sciences (CAS). He received B. S., M. S., and Ph. D. from the University of Tokyo, all in applied physics. He was an assistant professor at the University of Tokyo in 1999–2001, and a research scientist and a senior research scientist at RIKEN in 2001–2022. Since 2022, he is a professor at IOP, CAS. He received a Young Scientist Award of the Physical Society of Japan in 2009 and JSPS (Japan Society for the Promotion of Science) Prize in 2015.

报告摘要：

The p-wave superfluid 3He exhibits a number of exotic quantum phenomena which are intimately related to symmetry breaking and nontrivial topology, and their understanding has significant implications not only for condensed matter physics but also for particle physics and cosmology. In this talk, I will present two experimental studies of novel phenomena arising from symmetry breaking and nontrivial topology of superfluid 3He. First, I will present the first direct demonstration of chiral symmetry breaking in Weyl superfluid 3He-A phase by showing that electrons immersed in superfluid 3He-A exhibit an anomalous Hall effect. Second, I will present the direct observation of Majorana surface states formed at a free surface of topological 3He-B phase by using electrons trapped at the surface.