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SUMMARY:The Electron-Phonon Problem Revisited - Prof Steve Kivelson\, Stan
 ford University
DTSTART:20230531T150000Z
DTEND:20230531T160000Z
UID:TALK200725@talks.cam.ac.uk
CONTACT:Dr Nur Unal
DESCRIPTION:The electron-phonon problem lies at the core of much of the un
 derstanding of “conventional” metals and superconductors. It was also 
 long thought to be a theoretically solved problem. However\, contrary to a
  widely accepted folk theorem\, the Migdal approximation\, upon which this
  understanding is based\, breaks down when the dimensionless electron-phon
 on coupling is not small. I will discuss a variety of new features of this
  old problem that can be established theoretically using controlled quantu
 m Monte-Carlo and strong-coupling expansions\, and comment on their releva
 nce to a variety of puzzling observations in otherwise conventional metals
 \, especially the existence of a so-called “Plankian” bound on the T-l
 inear resistivity and a corresponding rough bound on the magnitude of l de
 termined from tunneling data in the superconducting stated. (This latter i
 s particularly striking in light of decades of searches for more strongly 
 coupled metals as part of the search for higher temperature superconductiv
 ity.)
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, J.J. Thomson Avenu
 e
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