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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2186
DTSTART:20111013T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260416T231830Z
LAST-MODIFIED:20111024T132334Z
LOCATION:5310 Chamberlin
SUMMARY:Pairing of critical Fermi-surface states\, R. G. Herb Condense
 d Matter Seminar\, Max Metlitski\, Kavli Institute for Theoretical Phy
 sics\, UC-Santa Barbara
DESCRIPTION:States of matter with a sharp Fermi-surface but no well-de
 fined Landau quasiparticles are expected to arise in a number of physi
 cal systems. Examples include i) the spinon Fermi-surface (U(1) spin-l
 iquid) state of a Mott insulator\, ii) the Halperin-Lee-Read composite
  fermion liquid state of a half-filled Landau level and iii) quantum c
 ritical points associated with the onset of order in metals. In this w
 ork\, we use renormalization group techniques to investigate possible 
 instabilities of such non-Fermi-liquids to pairing. We show that for a
  large class of phase transitions in metals\, the attractive interacti
 on mediated by order parameter fluctuations always leads to a supercon
 ducting instability\, which preempts the non-Fermi-liquid effects. On 
 the other hand\, the spinon Fermi-surface and the Halperin-Lee-Read st
 ates are stable against pairing for a sufficiently weak attractive sho
 rt-range interaction. However\, once the strength of attraction exceed
 s a critical value\, pairing sets in. We describe the ensuing quantum 
 phase transition between i) the U(1) and the Z<sub>2</sub> spin-liquid
  states\, and ii) the Halperin-Lee-Read and Moore-Read states.
URL:https://www.physics.wisc.edu/events/?id=2186
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