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SUMMARY:Dirac and Weyl Semimetals: Synthesis and Characterization  - Dr Iv
 an Kokanovic\, University of Zagreb
DTSTART:20180308T141500Z
DTEND:20180308T151500Z
UID:TALK102007@talks.cam.ac.uk
CONTACT:Bartomeu Monserrat
DESCRIPTION:Dirac and Weyl semimetals are three-dimensional phases of matt
 er with gapless electronic excitations that are protected by topology and 
 symmetry. As three-dimensional analogs of graphene\, they have generated m
 uch recent interest.  They possess linear band dispersion in all three dim
 ensions (in k-space) around symmetry protected crossing points of the vale
 nce and conduction bands (Dirac points). Because of the nontrivial topolog
 y of the energy bands and the existence of Dirac points these materials po
 ssess fundamentally very interesting transport and magnetic properties. Cd
 3As2 is predicted to be a symmetry-protected topological semimetal with a 
 single pair of three-dimensional (3D) Dirac points in the bulk and unusual
   Fermi arcs on the surfaces. It can be driven into a topological insulato
 r and a Weyl semimetal state by symmetry breaking. The nodal loop ZrSiS se
 mimetal is regarded as a promising new material with a very wide energy wi
 ndow (0-2 eV) of linear Dirac dispersion and interesting non-symmorphic sy
 mmetry protected surface states. We have successfully synthesized monocrys
 tals of various 3D Dirac and Weyl semimetals: Pb0.83Sn0.17Se\, Cd3As2\, Ta
 P\, ZrSiS\, and measured their transport and magnetic properties. \n\nIn t
 his talk I will present detailed study of the transport and magnetic prope
 rties of these  Dirac and Weyl semimetal monocrystals with reduced charge 
 concentration. The de Haas-van Alphen (dHvA) and the Shubnikov-de Haas (Sd
 H) oscillations are used to probe the properties of the Fermi surface in t
 hese single crystals.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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