ABSTRACT
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 superconducting phenomena: (i) the emergence of nonrelativistic spin-orbital locking/textures governed by spin group symmetry; and (ii) unique superconducting proximity effects: in nodal altermagnets, we find spin-singlet pairs with finite momentum, while in nodeless altermagnets, we find a spin-polarized Josephson supercurrent. Second, I will move beyond band theory to show that altermagnetism is crucial for condensed matter theory. It completes the well-established Stoner theory of ferromagnetism, and through its fluctuations, can mediate an unconventional spin-triplet superconductor, which we call inter-orbital triplet pairing.
BIOGRAPHY
Lunhui Hu: a Hundred-Talent-Program professor at Zhejiang University. After earning both his B.S. (2013) and Ph.D. (2018) from Zhejiang, he held post-doctoral positions at UC San Diego, Penn State, the University of Tennessee, and Aalto University. In 2023 he was selected for the National Youth Talent Program for Overseas Scholars, and last August he joined Zhejiang University. His work explores the theory of novel quantum phenomena in condensed matter, especially topological states and unconventional superconductivity & magnetism. He has published 42 papers, including first or corresponding-author publications in Nat Phys/Nat Mater(2), PRL(3), Nat Comm/Sci Adv(5), Adv Mater(1).
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