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SUMMARY:Theories for electrical detection and control of altermagnetism an
 d nonlinear magnetization
DTSTART;VALUE=DATE-TIME:20260506T070000Z
DTEND;VALUE=DATE-TIME:20260506T080000Z
DTSTAMP;VALUE=DATE-TIME:20260503T050100Z
UID:indico-event-4990@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Haizhou Lu (卢海舟) (Southern University of Scien
 ce and Technology)\n\nHost: Prof. Anyuan Gao  Venue: TDLI Meeting Room 
 N600Tencent Meeting link: https://meeting.tencent.com/dm/4RLRVctzpIaNMeet
 ing ID: 259296394\, no password Abstract:Using only electricity to detect
 \, generate\, and control magnetism is of great potentials in applications
  but remains challenging. In this talk\, I will introduce our theories on 
 using only pure electric approaches to detect\, switch\, and generate unco
 nventional magnetism\, including altermagnetism and nonlinear magnetizatio
 n.Altermagnetism is an unconventional collinear antiferromagnetism. Its sp
 in-opposite sublattices cannot be related by inversion or translation. Thi
 s property gives altermagnetism the advantages of both ferromagnetism and 
 antiferromagnetism thus are promising in applications. I will introduce ho
 w to use Coulomb drag and nonlinear Hall effect to detect altermagnetism a
 nd how to use only electric current to switch the Neel order of altermagne
 tism deterministically.The Christoffel symbol is an essential quantity in 
 Einstein’s general theory of relativity. We discover that an electric fi
 eld can induce a nonlinear magnetization in quantum materials\, described 
 by the quantum Christoffel symbol. We identify many 2D material candidates
  that host this quantum Christoffel nonlinear magnetization. This nonlinea
 r Christoffel magnetization can be probed by optical techniques such as ma
 gneto-optical Kerr spectroscopy. More importantly\, this quantum Christoff
 el nonlinear magnetization gives a paradigm of how geometry dictates physi
 cs. References: [1] Yiyuan Chen\, Xiaoxiong Liu\, Hai-Zhou Lu\, and X. C
 . Xie\, "Electrical switching of altermagnetism"\, Phys. Rev. Lett. 135\, 
 016701 (2025). [2] Haojie Lin\, Songbo Zhang\, Hai-Zhou Lu\, and X. C. Xi
 e\, "Coulomb drag in altermagnets"\, Phys. Rev. Lett. 134\, 136301 (2025).
  [3] R. Y. Chu\, L. Han\, Z. H. Gong\, H. Z. Lu\, C. Song\, et al.\, "Thi
 rd-order nonlinear Hall effect in altermagnet RuO2"\, Phys. Rev. Lett. 135
 \, 216703 (2025). [4] Zhen-Hao Gong\, Zhi-Hao Wei\, Hai-Zhou Lu\, and X. 
 C. Xie\, "Identifying geometric third-order nonlinear transport in disorde
 red materials"\, arXiv:2510.24239. [5] Xiao-Bin Qiang\, Xiaoxiong Liu\, H
 ai-Zhou Lu\, X. C. Xie\, "Quantum Christoffel nonlinear magnetization"\, P
 hys. Rev. Lett. 136\, 056302 (2026).[6] Xuan Qian\, Xiao-Bin Qiang\, W. Z.
 \, Hai-Zhou Lu\, Yang Ji\, Kaiyou Wang\, et al.\, "Probing quantum geometr
 ic nonlinear magnetization via second-harmonic magneto-optical Kerr effect
 "\, Phys. Rev. B 113\, L041407 (2026). Biography:Haizhou Lu obtained his 
 Ph.D. in Physics from Institute for Advanced Study at Tsinghua University 
 in 2007. From 2007 to 2015\, he was a Postdoc then Research Assistant Prof
 essor at the University of Hong Kong. He joined SUSTech in 2015 and now is
  a Chair Professor and Head of Department of Physics. His research is focu
 sed on the quantum transport theories in topological matter. His publicati
 ons can be found at https://scholar.google.com/citations?user=9-SL76YAAAAJ
 &hl=en\n\nhttps://indico-tdli.sjtu.edu.cn/event/4990/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/4990/
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