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SUMMARY:Quantum Hall Physics in a Three-Dimensional Magnetic Crystal
DTSTART:20260930T020000Z
DTEND:20260930T030000Z
DTSTAMP:20260925T102600Z
UID:indico-event-5336@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Zexun Lin（林泽勋） (University of Cambridge)\n
 \nHost: Prof. Baiqing Lyu  \nVenue: TDLI Meeting Room N400\n \nAbstrac
 t:\nThe quantum Hall effect is usually associated with two-dimensional ele
 ctron systems. In three dimensions\, a magnetic field alone generally prod
 uces dispersive Landau bands rather than a bulk-gapped Hall insulator\, wh
 ile familiar constructions often begin with stacked quantum Hall layers. I
  will present a different route in a periodic pyrochlore crystal\, where a
  [111] magnetic field selects a three-in/one-out texture of localized mome
 nts. Through Kondo exchange\, this texture effectively produces a noncopla
 nar four-sublattice exchange field for itinerant electrons\, generating co
 mplex hopping amplitudes that mix the compact localized states into weakly
  dispersive bands. Remarkably\, the magnetic texture alone can stabilize a
  globally gapped phase throughout the three-dimensional Brillouin zone.  
 The resulting phase is a three-dimensional quantum Hall insulator with a q
 uantized Hall response characterized by a reciprocal-space Hall vector. I 
 will discuss its microscopic origin\, bulk transport signatures\, and the 
 properties of its chiral metallic surface states.\n \nBiography:\nZexun L
 in is a postdoctoral researcher in the TCM Group at the Cavendish Laborato
 ry\, University of Cambridge\, where he works with Prof. Nigel Cooper and 
 Claudio Castelnovo. He received his PhD in physics from the University of 
 Texas at Austin\, where he was supervised by Prof. Greg Fiete and Allan Ma
 cDonald. His current research interests include three-dimensional quantum 
 Hall physics in pyrochlore systems\, Wigner crystallization and fractional
 ization in moire transition-metal dichalcogenides\, and cavity quantum mat
 erials.\n\nhttps://indico-tdli.sjtu.edu.cn/event/5336/
LOCATION:Tsung-Dao Lee Institute/N4F-N400 - meeting room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5336/
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