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SUMMARY:Giandomenico Palumbo (Université Libre de Bruxelles)
DTSTART:20200713T160000Z
DTEND:20200713T170000Z
DTSTAMP:20260404T131147Z
UID:QM3/9
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QM3/9
 /">Four-dimensional semimetals with tensor monopoles: from surface states 
 to topological responses</a>\nby Giandomenico Palumbo (Université Libre d
 e Bruxelles) as part of Quantum Matter meets Maths (IST\, Lisbon)\n\n\nAbs
 tract\nQuantum anomalies offer a useful guide for the exploration of trans
 port phenomena 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
 \, coined "parity magnetic effect"\, which is induced by the parity anomal
 y in a four-dimensional topological semimetal. Upon preserving time-revers
 al symmetry\, the spectrum of our model is doubly degenerate and the nodal
  (Dirac) points behave like Z2 monopoles. When time-reversal symmetry is b
 roken\, while preserving the sublattice (chiral) symmetry\, our system sup
 ports spin- 3/2 quasiparticles and the corresponding Dirac-like cones host
  tensor monopoles characterized by a Z number\, the Dixmier-Douady invaria
 nt. In both cases\, the semimetal exhibits topologically protected Fermi a
 rcs on its boundary. Besides its theoretical implications in both condense
 d matter and quantum field theory\, the peculiar 4D magnetic effect reveal
 ed by our model could be measured by simulating higher-dimensional semimet
 als in synthetic matter.\n
LOCATION:https://stable.researchseminars.org/talk/QM3/9/
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