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SUMMARY:Ilya Esterlis (Harvard)
DTSTART:20210412T183000Z
DTEND:20210412T193000Z
DTSTAMP:20260423T005819Z
UID:Kadanoff/35
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Kadanoff/35/
 ">Large N theory of critical Fermi surfaces</a>\nby Ilya Esterlis (Harvard
 ) as part of Kadanoff seminars\n\n\nAbstract\nI will discuss recent work o
 n a large-N theory of critical Fermi surfaces in two dimensions. The theor
 y applies directly to the onset of Ising order in a Fermi liquid\, and is 
 easily generalized to other forms of order. By employing random couplings 
 in flavor-space while retaining spatial translation invariance\, we find t
 he large-N saddle point equations are the same as those appearing in other
  contexts\; e.g.\, Eliashberg-like theories\, and our approach therefore p
 rovides a systematic framework for assessing and going beyond such theorie
 s. I will also discuss the the large-N phase diagram of the system away fr
 om criticality\, and show that the ordered side is characterized by a regi
 me of unusually strong thermal fluctuations. Time permitting\, I will also
  review the behavior of various fermion bilinear operators\, which can be 
 used to diagnose the instabilities of the critical Fermi surface.\n
LOCATION:https://researchseminars.org/talk/Kadanoff/35/
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