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CATEGORIES:Theory of Condensed Matter
SUMMARY:Dirac and Weyl Semimetals: Synthesis and Character
ization - Dr Ivan Kokanovic\, University of Zagre
b
DTSTART;TZID=Europe/London:20180308T141500
DTEND;TZID=Europe/London:20180308T151500
UID:TALK102007AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/102007
DESCRIPTION:Dirac and Weyl semimetals are three-dimensional ph
ases of matter with gapless electronic excitations
that are protected by topology and symmetry. As t
hree-dimensional analogs of graphene\, they have g
enerated much recent interest. They possess linea
r band dispersion in all three dimensions (in k-sp
ace) around symmetry protected crossing points of
the valence and conduction bands (Dirac points). B
ecause of the nontrivial topology of the energy ba
nds and the existence of Dirac points these materi
als possess fundamentally very interesting transpo
rt and magnetic properties. Cd3As2 is predicted to
be a symmetry-protected topological semimetal wit
h a single pair of three-dimensional (3D) Dirac po
ints in the bulk and unusual Fermi arcs on the su
rfaces. It can be driven into a topological insula
tor and a Weyl semimetal state by symmetry breakin
g. The nodal loop ZrSiS semimetal is regarded as a
promising new material with a very wide energy wi
ndow (0-2 eV) of linear Dirac dispersion and inter
esting non-symmorphic symmetry protected surface s
tates. We have successfully synthesized monocrysta
ls of various 3D Dirac and Weyl semimetals: Pb0.83
Sn0.17Se\, Cd3As2\, TaP\, ZrSiS\, and measured the
ir transport and magnetic properties. \n\nIn this
talk I will present detailed study of the transpor
t and magnetic properties of these Dirac and Weyl
semimetal monocrystals with reduced charge concen
tration. The de Haas-van Alphen (dHvA) and the Shu
bnikov-de Haas (SdH) oscillations are used to prob
e the properties of the Fermi surface in these sin
gle crystals.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
CONTACT:Bartomeu Monserrat
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