BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Marcello Porta (SISSA) DTSTART:20210114T160000Z DTEND:20210114T173000Z DTSTAMP:20260423T035926Z UID:AQFP/6 DESCRIPTION:Title: Ano maly non-renormalization in interacting Weyl semimetals\nby Marcello P orta (SISSA) as part of Analysis\, Quantum Fields\, and Probability\n\n\nA bstract\nWeyl semimetals are three-dimensional condensed matter systems ch aracterized by a degenerate Fermi surface\, consisting of a pair of `Weyl nodes'. Correspondingly\, in the infrared limit\, these systems behave eff ectively as Weyl fermions in 3+1 dimensions. As predicted by Nielsen and N inomiya in 1983\, when exposed to electromagnetic fields these materials a re expected to simulate the axial anomaly of QED\, by giving rise to a net quasi-particle flow between Weyl nodes.\n \n\nWe consider a class of inte racting lattice models for Weyl semimetals and prove that the quadratic re sponse of the quasi-particle flow is universal\, and equal to the chiral t riangle graph of QED. Universality is the counterpart of the Adler-Bardeen non-renormalization property of the axial anomaly for QED\, in a condense d matter setting. Our proof relies on the rigorous Wick rotation for real- time transport coefficients\, on constructive bounds for Euclidean ground state correlations\, and on lattice Ward Identities. Joint work with A. Gi uliani and V. Mastropietro.\n LOCATION:https://researchseminars.org/talk/AQFP/6/ END:VEVENT END:VCALENDAR