题目：Anomalous Magnetic Moments as Evidence of Chiral Superconductivity in Bi/Ni Bilayer

时间：2020年11月4日（周三）下午14:00-16:00

报告人： 吕力  研究员    中国科学院物理研究所

报告摘要：

There have been continuous efforts in searching for unconventional superconductivity over the past five decades. But there still lacks of a common agreement on the existence of chiral superconductivity with broken time reversal symmetry (TRS) and spontaneous magnetization. Bi/Ni epitaxial bilayer is a potential unconventional superconductor with broken TRS, for that it demonstrates superconductivity and ferromagnetism simultaneously at low temperatures [1,2]. In this talk, I will present our phase-sensitive investigation on Bi/Ni [3]. We employ a specially designed superconducting quantum interference device (SQUID) constructed in situ on the Bi/Ni bilayer, to detect the orbital magnetic moment which is expected if the TRS is broken. An anomalous hysteretic magnetic response has been observed in the superconducting state, providing the evidence for the existence of chiral superconducting domains in the material.

References

[1] X. X. Gong, H. X. Zhou, P. C. Xu, D. Yue, K. Zhu, X. F. Jin, H. Tian, G. J. Zhao, and T. Y. Chen, Chin. Phys. Lett. 32, 067402 (2015).

[2] X. X. Gong, M. Kargarian, A. Stern, D. Yue, H. X. Zhou, X. F. Jin, V. M. Galitski, V. M. Yakovenko, and J. Xia, Sci. Adv. 3, e1602579 (2017).

[3 J. H. Wang, X. X. Gong, G. Yang, Z. Z. Lyu, Y. Pang, G. T. Liu, Z. Q. Ji, J. Fan, X. N. Jing, C. L. Yang, F. M. Qu, X. F. Jin, and L. Lu, Phys. Rev. B 96, 054519 (2017).

 报告人简介：

吕力，中国科学院物理研究所研究员，主要从事低温凝聚态物理的实验研究，包括低维材料的电输运性质和热学性质研究、介观器件的制备和量子调控研究等。他曾经担任过物理所极端条件实验室、崔琦实验室、固态量子信息与计算实验室的主任，担任过物理所的副所长。目前是物理所怀柔研究部主任，同时也是中国物理学会出版工作委员会主任。他2012年当选美国物理学会会士，2016年当选英国物理学会会士。

联系人：罗会仟(82649816, hqluo@iphy.ac.cn)

主办：中科院物理所超导国家重点实验室、学术服务部

协  办：《物理学报》|CPL|CPB|《物理》四刊