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SUMMARY:The next generation of Dirac materials\, from discovery to new phy
 sical phenomena realized in the solid state - Leslie Schoop\, Max-Planck I
 nstitute for Solid State Research\, Stuttgart\, Germany.
DTSTART:20161019T101500Z
DTEND:20161019T111500Z
UID:TALK67982@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:In this talk I will discuss the recent progress of research in
  the field of Dirac materials. I will discuss the challenges this field is
  still facing and introduce a materials chemist’s view on identifying ne
 w candidate materials.\n\n3D Dirac materials (3D DMs) are materials that h
 ave the same electronic structure as graphene\, i.e. they host mass-less e
 lectrons that behave like photons rather than usual electrons. They can be
  identified from their electronic structure that features linearly dispers
 ed bands that cross at a single point\, called a Dirac point. Recently\, t
 here has been considerable interest in these materials because they exhibi
 t exotic physical properties such as ultra-high mobilities\, as well as ve
 ry large magnetoresistance (MR). These make 3D DMs promising for different
  applications\, for example in electronics or data storage. \nFurthermore\
 , 3D DMs are of interest for fundamental physics. The discovery of the Wey
 l fermion in Dirac materials with broken inversion symmetry last year was 
 a milestone for particle physics realized in a solid material. \n\nIn orde
 r to use 3D DMs for any kind of applications\, new better materials are re
 quired. I will introduce the first stable\, cheap and non-toxic 3D DSM\, w
 hich is currently the best candidate material for future applications.\n\n
 Further\, compounds that crystallize in non-symmorphic space groups recent
 ly gained a lot of attention from theoretical physicists. In space groups 
 that are non-symmorphic\, the glide planes or screw axis cause a doubling 
 of the unit cell. This leads to a folding BZ and causes the bands to be de
 generate at the BZ boundaries and can thus yield Dirac cones. A very recen
 t prediction suggested that non-symmorphic symmetry can also lead to types
  of fermions that are distinct form Dirac\, Weyl or Majorana. These exotic
  new quasiparticles have yet to be discovered. \n\nProblematic for realizi
 ng these types of Dirac materials is that they require and odd band fillin
 g in order to have the Fermi level located at or near the band crossing po
 ints. I will show how we used chemical concepts to experimentally verify a
  fourfold degenerate point at the Fermi level.\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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