Theoretical Physics Seminar: Alexander Krikun

  • Date: –12:00
  • Location: Ångströmlaboratoriet, Lägerhyddsvägen 1 Å10134
  • Lecturer: Alexander Krikun
  • Contact person: Vladimir Procházka
  • Phone:
  • Seminarium

Isolated zeros destroy segments of Fermi surface in holographic models with a lattice

I will discuss the fermionic response of the holographic model of a strange metal in the non-homogeneous black hole background created by the periodically modulated chemical potential. Apart from the observation of the standard umklapp and the band formation, which is expected to occur in any system with the periodic potential, I will show that in the regimes of strong modulation the lines of zeros of the spectral function get pushed close to the lines of poles indicating the Fermi surface. This proximity destroys the full segments of the latter. The existence of zeros is the generic feature of the holographic fermionic response, which can be related to the alternatively quantized dual CFT. While the effect which  we will see, relies substantially on the particularity of the holographic framework, it is quite similar to the Fermi arc formation in the pseudogap phase of the doped cuprates, observed experimentally.

Based on: arXiv:1909.09394