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SUMMARY:imaging and Harnessing the Topological Boundary Modes
DTSTART;VALUE=DATE-TIME:20260415T070000Z
DTEND;VALUE=DATE-TIME:20260415T080000Z
DTSTAMP;VALUE=DATE-TIME:20260503T050100Z
UID:indico-event-4913@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Zhenyu Wang（王震宇） (University of Science an
 d Technology of China)\n\nHost: Prof. Baiqing Lv  Venue: TDLI Meeting R
 oom N600Tencent Meeting link: https://meeting.tencent.com/dm/U4rca1Akx74A
  Meeting ID: 315522337\, no password Abstract:Topologically protected ed
 ge channels show prospects for quantum devices [1]. In this talk we provid
 e evidence for robust topological helical edge states within a novel topol
 ogy named three-dimensional (3D) QSHIs. Its topology originates solely fro
 m a nonzero spin Chern number for each plane of the crystal and is realize
 d in both bulk α-Bi4I4 with trivial symmetry indicators and α-Bi4Br4 wit
 h inversion Z4 index. We experimentally observe the edge modes at each typ
 e of monolayer and bilayer step of these materials by scanning tunneling m
 icroscopy (STM). These edges states are linearly dispersing protected by a
  large bulk gap spanning EF\, robust against disorders and vertical stacki
 ng [2]. Based on these findings\, we fabricate a novel “topological” S
 TM tip with these materials\, and show how the tunneling of the helical ed
 ge state becomes a metrological resource for atomic-scale spin sensing owi
 ng to the time-reversal-symmetry paired spin-momentum locking. As a string
 ent benchmark\, we apply this helical tunneling spin probe to the layered 
 altermagnetic material KV2Se2O and directly image the defining alternating
  spin texture in both real and momentum space [3].  References:[1] S. Ph
 ark et al.\, Nano Futures 9\, 032001(2025)\;[2] S. Yu et al.\, Phys. Rev. 
 X 14\, 041048 (2024)\; [3] Z. Wang et al.\, arXiv: 2512.23290 (2025) Bio
 graphy:Professor Zhenyu Wang obtained his PhD from Institute of Physics\, 
 Chinese Academy of Sciences\, in 2015. Then he held a postdoctoral appoint
 ment at the University of Illinois Urbana-Champaign\, before joining the p
 hysics faculty at University of Science and Technology of China in 2019. H
 e became a full professor of Physics in 2023. His research interests lie i
 n the realm of quantum materials\, including unconventional superconductor
 s\, Mott insulators and topological matters. He uses the tool of STM to un
 ravel the mysteries of these complex systems\, and the fundamental goal is
  to directly visualize their emergent behaviors and manipulate their prope
 rties. He has Now Prof. Wang’s lab focuses on STM studies of topological
  superconductors and moiré superlattice where both electronic interaction
 s and quantum geometry play the vital role in shaping their electronic pro
 perties. \n\nhttps://indico-tdli.sjtu.edu.cn/event/4913/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/4913/
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