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Condensed Matter Seminars
Condensed Matter
Thursday, April 13, 2017
3:30 PM
Physics Building, Room 204
Note special time.
Note special room.

Syed Raza
[Host: Jeffrey Teo]
UVA Physics Department
"Symmetry preserving gapping of Topological Weyl and Dirac semimetals"

ABSTRACT:
Topological Weyl and Dirac semimetals in three dimensions have gapless (massless) Weyl fermions. These semimetals were predicted theoretically in 2011 (Vishwanath et al, Burkov and Balents) and have been experimentally discovered recently in TaAs, TaP, NbAs, NbP (Weng et al., Huang et al., Shekhar et al., 2015). Although these gapless systems can be gapped (given mass) trivially by symmetry breaking terms, a more interesting problem is if they can be gapped without breaking symmetries? We show that you can indeed do this by introducing many body interactions. We also show that this symmetrypreserving gapping gives pointlike and linelike anyonic excitations in the gapped bulk.




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