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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:Subir Sachdev – Harvard\n        \nWednesday, January 14, 2026\nZoom opens:
  10:30AM EST\nSeminar begins: 10:45AM EST\n \nDetecting a quantum spin liqu
 id in the cuprate superconductors\nFollowing the prescient suggestion of P.
 ~W.~Anderson in 1987, there were numerous early theories of the phases of t
 he cuprate high temperature superconductors as doped quantum spin liquids. 
 However these theories have had difficulties with a number of important obs
 ervations. I will describe the fractionalized Fermi liquid (FL*) state, pro
 posed in 2002, which dopes quantum spin liquids with gauge-neutral electron
 -like quasiparticles. The FL* state has a Fermi surface enclosing a non-Lut
 tinger area, and this is made possible by the presence of a quantum spin li
 quid with fractionalized excitations. Recent angle-dependent magnetoresista
 nce (ADMR) measurements in the lightly-doped `pseudogap’ metal show compell
 ing evidence  for holes which can tunnel coherently between square lattice 
 layers, and occupy pocket Fermi surfaces enclosing an area close to that pr
 edicted by the FL* theory. A gauge theory for the FL* and neighboring phase
 s in a single-band square lattice Hubbard-type model will be outlined\n
X-ALT-DESC;FMTTYPE=text/html:<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:20260827T144202
DTSTART;TZID=America/New_York:20260114T104500
DTEND;TZID=America/New_York:20260114T120000
SEQUENCE:0
TRANSP:OPAQUE
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