BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Giandomenico Palumbo (Université Libre de Bruxelles)
DTSTART:20200713T160000Z
DTEND:20200713T170000Z
DTSTAMP:20260423T040330Z
UID:QM3/9
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QM3/9/">Four
 -dimensional semimetals with tensor monopoles: from surface states to topo
 logical responses</a>\nby Giandomenico Palumbo (Université Libre de Bruxe
 lles) as part of Quantum Matter meets Maths (IST\, Lisbon)\n\n\nAbstract\n
 Quantum anomalies offer a useful guide for the exploration of transport ph
 enomena in topological semimetals. A prominent example is provided by the 
 chiral magnetic effect in three-dimensional Weyl semimetals\, which stems 
 from the chiral anomaly. Here\, we reveal a distinct quantum effect\, coin
 ed "parity magnetic effect"\, which is induced by the parity anomaly in a 
 four-dimensional topological semimetal. Upon preserving time-reversal symm
 etry\, the spectrum of our model is doubly degenerate and the nodal (Dirac
 ) points behave like Z2 monopoles. When time-reversal symmetry is broken\,
  while preserving the sublattice (chiral) symmetry\, our system supports s
 pin- 3/2 quasiparticles and the corresponding Dirac-like cones host tensor
  monopoles characterized by a Z number\, the Dixmier-Douady invariant. In 
 both cases\, the semimetal exhibits topologically protected Fermi arcs on 
 its boundary. Besides its theoretical implications in both condensed matte
 r and quantum field theory\, the peculiar 4D magnetic effect revealed by o
 ur model could be measured by simulating higher-dimensional semimetals in 
 synthetic matter.\n
LOCATION:https://researchseminars.org/talk/QM3/9/
END:VEVENT
END:VCALENDAR