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SUMMARY:Alexander Altland (University of Cologne)
DTSTART:20210329T160000Z
DTEND:20210329T170000Z
DTSTAMP:20260423T024744Z
UID:QM3/40
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QM3/40/">Spe
 ctral density of weakly disordered Weyl semimetals</a>\nby Alexander Altla
 nd (University of Cologne) as part of Quantum Matter meets Maths (IST\, Li
 sbon)\n\n\nAbstract\nWeyl semimetals contain an even number of singular po
 ints in their Brillouin zone around which the dispersion is linear and the
  density of states (DoS) vanishes. How does the density of states change i
 n the (inevitable) presence of impurities? This question has been the subj
 ect of an intensive and partially controversial discussion in the recent l
 iterature. In particular\, it has been suggested that below a critical dis
 order strength the DoS remains zero\, and that the system supports a phase
  transition separating an intrinsically clean from a disordered phase. In 
 this talk\, I discuss this problem on the basis of several effective model
 s. All these support the integrity of the Weyl node and hence are compatib
 le with the above scenario. I will also comment on the (tricky) comparison
  to numerics and point out a puzzle whose solution invites mathematical re
 search.\n
LOCATION:https://researchseminars.org/talk/QM3/40/
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