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UID:DSC-15278
DTSTART;TZID=Europe/Berlin:20190506T163000
SEQUENCE:1557075216
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20190506T173000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/15278
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Chubukov: Colloquium:  Interplay between superconductivity and non-
 Fermi liquid above a quantum critical point in a metal
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Andrey Chubukov\nInstitute of Speaker: Universit
 y of Minnesota\, USA\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS ()\n  S
 treet: Nöthnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351
  871 0\n  Fax: \nDescription: I discuss the interplay between non-Fermi li
 quid behavior and superconductivity near a quantum-critical point (QCP) in
  a metal. It is widely thought that the tendency towards superconductivity
  and towards non-Fermi liquid behavior compete with each other\, and if th
 e pairing interaction is reduced below a certain threshold\, the system di
 splays a naked non-Fermi liquid QC behavior. I show that the situation is 
 more complex. First\, there is a difference between spin-triple and spin-s
 inglet superconductivity. For spin-triplet pairing\, thermal fluctuations 
 are crucial and make superconducting transition first order. For spin-sing
 let pairing\, they are essentially irrelevant\, and the transition is seco
 nd order. Second\, I show that for spin-singlet pairing\, there are multip
 le solutions with the same gap symmetry. For all solutions\, except one\, 
 Tc vanishes when the pairing interaction drops below the threshold. For th
 e one special solution\, Tc remains finite even when the pairing interacti
 on is arbitrary small\, despite that there is no Cooper logarithm. I argue
  that superconductivity between this Tc and a lower T\, when other solutio
 ns appear\, is special\, as it is entirely induced by fermions with the fi
 rst Matsubara frequency. I show that this has specific implications for th
 e observable quantities\, such as the density of states and the spectral f
 unction.
DTSTAMP:20260528T111106Z
CREATED:20181108T000753Z
LAST-MODIFIED:20190505T165336Z
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