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SUMMARY:Novel properties due to crystal symmetry in altermagnets
DTSTART;VALUE=DATE-TIME:20260417T060000Z
DTEND;VALUE=DATE-TIME:20260417T070000Z
DTSTAMP;VALUE=DATE-TIME:20260503T022000Z
UID:indico-event-4944@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Junwei Liu（刘军伟） (Hong Kong University of S
 cience and Technology)\n\nHost: Prof. Anyuan Gao  Venue: TDLI Meeting 
 Room N600Tencent Meeting link: https://meeting.tencent.com/dm/vdqjDKJUsSu
 w Meeting ID: 975232008\, no password Abstract:I will talk about the nov
 el properties due to crystal symmetry spin-splitting antiferromagnets (AFM
 s) [Nat. Commun. 12\, 2846 (2021)] (widely known as altermagnets now). In 
 2021\, we propose the crystal-symmetry-paired spin-valley/momentum locking
  (CSVL/CSML)\, which is enabled by crystal symmetries intrinsically in AFM
 s (e.g.\, V2Se2O\, V2Te2O\, MnTe and RuO2) [Nat. Commun. 12\, 2846 (2021)\
 ; Phys. Rev. X 15\, 021083 (2025)]. CSML enables feasible controls of AFMs
  by manipulating the corresponding crystal symmetry. Typically\, one can u
 se a strain field to induce net valley polarization/magnetization and use 
 an electric field to generate a noncollinear spin current even without spi
 n-orbit coupling. All the predictions have been confirmed in experiments [
 Nat. Phys. 21\, 760 (2025)\; Nat. Phys. 21\, 754 (2025)]. These properties
  have helped us realize the electric readout and 180o deterministic switch
 ing of the Néel order in our experimental work [Sci. Adv. 10\, eadn0479 (
 2024)\; Nature 638\, 645 (2025)]\, which can be well understood by switchi
 ng symmetry in our recent proposed unified theory of all magnetic determin
 istic switching [arXiv:2603.29136]. Biography:Professor Junwei Liu earned
  his Ph.D. from Tsinghua University in 2014 and conducted postdoctoral res
 earch at MIT from 2014 to 2017. He joined the Hong Kong University of Scie
 nce and Technology (HKUST) as an Assistant Professor in 2017 and was promo
 ted to Associate Professor in 2023. His research interests span condensed 
 matter physics\, materials science\, and machine learning.In the discovery
  of new phases\, he successfully predicted the SnTe-type topological cryst
 alline insulator\, the WTe₂-type and TaIrTe₄-type quantum spin Hall in
 sulators and achieved the first experimental observation of monolayer ferr
 oelectricity in SnTe thin films. In methodological development\, he has co
 mbined machine learning with effective models to create self-learning Mont
 e Carlo methods\, achieving speedups of several orders of magnitude withou
 t loss of accuracy. He also designed and realized the world’s first all-
 optical neural network.His current research focuses on novel quantum pheno
 mena arising from crystal symmetry and his related contributions include (
 1) theoretical proposal of crystal-symmetry-paired spin-valley locking in 
 collinear spin-splitting antiferromagnets (also named altermagnet) and its
  realization and experimental verification in V2(Se\, Te)2O-family materia
 ls [Nature Communications 12\, 2846 (2021)\; Physical Review X 15\, 021083
  (2024)\; Nature Physics 21\, 760-767 (2025)]\, which is also the first la
 yered quasi-2D altermagnets\; (2) the first electrical readout and 180° s
 witching of the Néel order in a collinear spin-splitting antiferromagnet 
 [Sci. Adv.10\, eadn0479 (2024)]\; and (3) the first demonstration of multi
 ple Majorana zero modes in a single vortex and their hybridization [Nature
 633\, 71–76 (2024)].He has published more than 80 papers\, including 2 i
 n Science\, 3 in Nature\, 2 in Nature Physics\, 3 in Nature Materials\, 7 
 in Nature Communications\, 1 in Physical Review X\, 4 in Physical Review L
 etters\, and 1 in Optica.\n\nhttps://indico-tdli.sjtu.edu.cn/event/4944/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/4944/
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