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UID:17bcaced-4fd3-48d1-8183-042e5484c296@nexttoyou
DTSTAMP:20261106T172905Z
DTSTART:20261119T180000Z
DTEND:20261119T190000Z
SUMMARY:Condensed Matter Theory Seminar - Zhengyan Darius Shi - Stanford U
 niversity
LOCATION:Sloane Physics Laboratory 56\, 217 Prospect Street\, New Haven\, 
 CT 06511
DESCRIPTION:Metallogenic quantum criticality: topological phase transition
 s beyond conformal field theories\n\nContinuous quantum phase transitions
  in interacting many-body systems exhibit universal phenomena that are la
 rgely independent of microscopic details. An organizing principle distill
 ed from canonical examples such as the magnetic transition in Ising model
 s is that the low-energy physics of transitions between gapped phases is 
 governed by scale-invariant quantum field theories with gapless degrees o
 f freedom at isolated points in momentum space. In this talk\, we show th
 at this principle can fail in a radical way: an entire gapless Fermi surf
 ace can emerge at a quantum critical point separating two fully gapped in
 sulators. These exotic phase transitions are dubbed metallogenic quantum 
 critical points (MGQCP). We construct a controlled family of effective fi
 eld theories for MGQCPs between distinct fractional Chern insulators and 
 propose a periodically modulated quantum Hall bilayer as a minimal micros
 copic setting. The critical theory exhibits an unusual mixture of physica
 l signatures: while transport and compressibility follow scaling laws com
 patible with a conformal field theory\, the electron spectral function de
 velops a power-law non-analyticity at the Fermi momentum\, characteristic
  of non-Fermi-liquid metals. We discuss how the concept of MGQCP may shed
  new light on critical phenomena in moire materials with tunable Chern ba
 nds. More generally\, our results point to a broader clas\n\nhttp://next-
 to-u.app/events/17bcaced-4fd3-48d1-8183-042e5484c296
URL:http://next-to-u.app/events/17bcaced-4fd3-48d1-8183-042e5484c296
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