【直播】【北大量子材料科学中心】Symmetry Breaking and Topology in Superfluid ³He

报告题目：

Symmetry Breaking and Topology in Superfluid ³He

报告时间：

2023年5月31日（周三）15:00

报告嘉宾：

Hiroki Ikegami（Institute of Physics (IOP), Chinese Academy of Sciences (CAS)）

主办单位：

北京大学量子材料科学中心

直播通道

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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 Graduate School of Arts and Sciences, 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. His research is focused on experimental studies of condensed matter systems at ultralow temperatures, in particular on the superfluid ³He, electrons trapped on a helium surface, and superconducting quantum circuits. 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.

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 understanding of those phenomena has significant implications not only on condensed matter physics but also on particle physics and cosmology [1]. 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 time-reversal symmetry breaking in Weyl superfluid ³He-A phase by showing that electrons immersed in superfluid ³He-A exhibit an anomalous Hall effect [2]. 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 [3,4].

[1] G. E. Volovik, The Universe in a Helium Droplet (Oxford University Press, Oxford, 2003). [2] H. Ikegami, Y. Tsutsumi, and K. Kono, Science 341, 59 (2013). [3] H. Ikegami and K. Kono, J. Low Temp. Phys. 195, 343 (2019) (arXiv:1805.11231).[4] Y. Tsutsumi, Phys. Rev. Lett. 118, 145301 (2017). 

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