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UID:1e6228547bbd47618e213b4c0a3e631f
CATEGORIES:Mathematical Physics Seminar
CREATED:20251224T123230
SUMMARY:Webinar: Subir Sachdev - Detecting a quantum spin liquid in the cuprate superconductors
LOCATION:Zoom
DESCRIPTION:<p style="text-align: center;"><strong>Subir Sachdev –&nbsp;Harvard</strong
 ></p><p style="text-align: center;"><strong>&nbsp; &nbsp;&nbsp;&nbsp; &nbsp
 ;&nbsp;</strong></p><p style="text-align: center;"><strong>Wednesday,&nbsp;
 January 14,&nbsp;2026</strong></p><p style="text-align: center;"><strong>Zo
 om opens: 10:30AM EST</strong></p><p style="text-align: center;"><strong>Se
 minar begins: 10:45AM EST</strong></p><p style="text-align: center;"><stron
 g>&nbsp;</strong></p><p style="text-align: center;"><strong>Detecting a qua
 ntum spin liquid in the cuprate superconductors</strong></p><p>Following th
 e prescient suggestion of P.~W.~Anderson in 1987, there were numerous early
  theories of the phases of the cuprate high temperature superconductors as 
 doped quantum spin liquids. However these theories have had difficulties wi
 th a number of important observations. I will describe the fractionalized F
 ermi liquid (FL*) state, proposed in 2002, which dopes quantum spin liquids
  with gauge-neutral electron-like quasiparticles. The FL* state has a Fermi
  surface enclosing a non-Luttinger area, and this is made possible by the p
 resence of a quantum spin liquid with fractionalized excitations. Recent an
 gle-dependent magnetoresistance (ADMR) measurements in the lightly-doped `p
 seudogap’ metal show compelling evidence &nbsp;for holes which can tunnel c
 oherently between square lattice layers, and occupy pocket Fermi surfaces e
 nclosing an area close to that predicted by the FL* theory. A gauge theory 
 for the FL* and neighboring phases in a single-band square lattice Hubbard-
 type model will be outlined</p>
CONTACT:Subir Sachdev
DTSTAMP:20260827T110650
DTSTART;TZID=America/New_York:20260114T104500
DTEND;TZID=America/New_York:20260114T120000
SEQUENCE:0
TRANSP:OPAQUE
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