| 报告人简介 | Lun-Hui Hu is an assistant professor at Zhejiang University. After earning both his B.S. (2013) and Ph.D. (2018) from Zhejiang, he held post-doctoral positions at University of California, San Diego, Pennsylvania State University, the University of Tennessee, and Aalto University. In 2023, he joined Zhejiang University. His research focuses on the theory of novel quantum phenomena in condensed matter, especially topological states of matter, unconventional superconductivity and magnetism. He has published 42 papers, including first- or corresponding-author publications in Nature Physics/Material (2), Physical Review Letters (3), Nature Communications/Science Advances (5), and Advanced Materials (1). |
报告摘要 | Altermagnet is a newly discovered class of antiferromagnets characterized by nonrelativistic spin-split bands, opening a new frontier in quantum materials. In this talk, I will discuss two key aspects of altermagnetism. First, I will show how altermagnetism enables novel quantum phenomena: (i) the emergence of nonrelativistic spin-orbital locking/textures governed by spin group symmetry [1]; and (ii) unique superconducting proximity effects: in nodal altermagnets, we find spin-singlet pairs with finite momentum [2], while in nodeless altermagnets, we find a spin-polarized Josephson supercurrent [3]. Second, I will move beyond band theory to show that altermagnetic fluctuation is crucial for condensed matter theory. It completes the well-established Stoner theory of ferromagnetism [4], and through its fluctuations, can mediate an unconventional spin-triplet superconductor, which we call inter-orbital triplet pairing [5]. Refs: [1] ZM Wang, et al., Spin-orbital altermagnetism, Phys. Rev. Lett. 135, 176705 (2025). [2] SB Zhang, et al., Finite-momentum Cooper pairing in proximitized altermagnets, Nature Communications 15, 1801 (2024). [3] C Li, et al., Spin-Polarized Josephson Supercurrent in Nodeless Altermagnets, arXiv:2509.13838 (2025). [4] C Lu, et al., Breakdown of Stoner Ferromagnetism by Intrinsic Altermagnetism, arXiv:2510.00614 (2025). [5] C Lu, et al., Inter-orbital spin-triplet superconductivity from altermagnetic fluctuations,arXiv:2510.19083(2025). |
