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SUMMARY:Matter Seminar: Interacting Weyl Fermions (Chris Hooley\, Coventry)
DESCRIPTION:Interacting Weyl fermions: isolated Green’s function zeros\, 
 topology\, and non-Fermi-liquid behaviour\nChris Hooley (Coventry Universi
 ty) \nIn this talk\, I shall present some work carried out with Rafael Fl
 ores Calderón [1] in which we ask what happens if we take a model of ferm
 ions whose non-interacting dispersion relation contains a Weyl point and a
 dd a particular ‘toy-model’ type of electron-electron interaction (the
  Hatsugai-Kohmoto interaction).  As I shall show\, this separates the sin
 gle-particle dispersion curves into upper and lower Hubbard bands with an 
 energy gap between them\, but leaves a zero of the single-particle Green
 ’s function where the Weyl point used to be: we call this a “Weyl-Mott
  point.”  Because of it\, the insulating state obtained at intermediate
  values of the chemical potential is topological\, and the boundary betwee
 n the insulating and metallic states is a non-Fermi liquid.\n[1] R. Flores
 -Calderón and CAH\, “Weyl-Mott point: Topological and non-Fermi liquid 
 behavior from an isolated Green’s function zero\,” Phys. Rev. B 111\, 
 235139 (2025).
URL:https://www.imperial.ac.uk/events/208251/matter-seminar-interacting-wey
 l-fermions/
DTSTART;TZID=Europe/London:20260413T140000
DTEND;TZID=Europe/London:20260413T150000
LOCATION:630\, Blackett Building\, South Kensington Campus\, Imperial Colle
 ge London\, London\, SW7 2AZ\, United Kingdom
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