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SUMMARY:Topology\, Semimetals and Gapless Phases  - Siddharth Parameswaran
  (Oxford)
DTSTART:20171026T120000Z
DTEND:20171026T130000Z
UID:TALK77711@talks.cam.ac.uk
CONTACT:Dr. Carl Turner
DESCRIPTION:I will examine the role of topological ideas in understanding 
 semimetals\, gapless phases whose Fermi surfaces may be shrunk to isolated
  point nodes. First\, I will review the theory of ‘Weyl semimetals’ th
 at arise from accidental degeneracies in 3D crystals\, and explore the con
 sequences of the resulting band topology\, including for “quantum anomal
 ies".  I will show that the interplay of crystal symmetry and topology can
  aid in identifying “filling-enforced” semimetals\, including in stron
 gly correlated systems such as heavy fermion materials.  I will also sketc
 h how the topological underpinnings of these gapless phases may be probed 
 experimentally via transport and spectroscopy\, and through numerical simu
 lations of their descendant gapped phases.
LOCATION:Potter Room (first floor\, Pav. B)
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