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SUMMARY:Spin-Charge Groups for Fermions in Fluids and Crystals
DTSTART;VALUE=DATE-TIME:20260413T060000Z
DTEND;VALUE=DATE-TIME:20260413T070000Z
DTSTAMP;VALUE=DATE-TIME:20260503T050100Z
UID:indico-event-4911@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: ZhengXin Liu (刘正鑫) (Renmin University of China
 )\n\nHost: Prof. Xin Liu  Venue: TDLI Meeting Room N600Tencent Meeting 
 link: https://meeting.tencent.com/dm/jhlv9TmUFK6jMeeting ID: 649105098\, 
 no password Abstract:Known symmetry groups are not sufficient to handle v
 arious couplings between spin\, charge and spatial degrees of freedom for 
 fermions. In this talk\, we introduce the spin-charge groups (SCG) to desc
 ribe the most general symmetries of fermionic systems. These groups are co
 mposed of the spin and charge operations as the `internal' symmetries\, th
 e spatial and temporal operations as `external' symmetries\, couplings bet
 ween them\, and projective twists. After providing the general group struc
 tures of SCG\, we study their potential applications in concrete physical 
 systems\, including $^3$He superfluids\, charge-4e superconductors\, colli
 near magnets with spin-fluxes\, and superconductors with coexisting magnet
 ic orders. We show that SCSG can give rise to extra band degeneracies\, Ch
 ern numbers and cross spin-charge responses. Biography:Zheng-Xin Liu obta
 ined his Ph.D in the Hong Kong University of Science and Technology in 201
 0. Then he worked in IAS of Tsinghua University for five years and joined 
 Renmin University of China in 2015. Dr. Liu's research interest includes t
 opological phases of matter\, quantum magnetism\, superconductivity\, and 
 many-body quantum computation. With collaborators\, he worked out the clas
 sification of bosonic SPT phases\, proposed multi-node quantum spin liquid
 s in Kitaev systems\, and classified the general symmetry groups for magne
 tic crystals and fermionic systems.\n\nhttps://indico-tdli.sjtu.edu.cn/eve
 nt/4911/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/4911/
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