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SUMMARY:Quantum Hall Physics in a Three-Dimensional Magnetic Crystal
DTSTART:20261109T151500
DTSTAMP:20261109T130242Z
UID:a1b3ceea3c185bbc91aef178ac8a3713d0aa54e6d2cdd79855c9f49e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Zexun Lin \n\nUniversity of Cambridge\, UK\nAbstract: 
  \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 
LOCATION:PH L1 503 https://plan.epfl.ch/?room==PH%20L1%20503 https://epfl.
 zoom.us/j/62037974673?pwd=wyXGR0mO9a7X2bmU69iYk1VnLWvnet.1
STATUS:CONFIRMED
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