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SUMMARY:“Topology in materials science” - Prof Claudia Felser\, MPI fo
 r Chemical Physics of Solids\, Dresden
DTSTART:20170510T150000Z
DTEND:20170510T160000Z
UID:TALK72567@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:Topological insulators\, Weyl and Dirac Semimetals are a new q
 uantum state of matter\, which have attracted interest of condensed matter
  science. Tunable families of compounds such as Heusler compounds\, binary
  phosphides and chalcogenides allows for a design of these new properties 
 and their systematic study. Many known compounds were reclassified through
  the lens of topology. \nHeusler compounds are a remarkable class of mater
 ials with more than 1\,000 members and a wide range of extraordinary multi
 functionalities [1] including tunable topological insulators (TI) [2\,3] a
 nd Weyl semimetals [4\,5]. Many of these ternary zero-gap semiconductors i
 n Heusler compounds (LnAuPb\, LnPdBi\, LnPtSb and LnPtBi) contain the rare
 -earth element Ln\, which can realize additional properties ranging from s
 uperconductivity (for example LaPtBi) to magnetism (for example GdPtBi) an
 d heavy fermion behavior (for example YbPtBi). These properties can open n
 ew research directions in realizing the quantized anomalous Hall Effect an
 d topological superconductors. C1b Heusler compounds have been grown as si
 ngle crystals and as thin films. The band inversion is proven by ARPES [6]
  and a large anomalous Hall can be explained within a Weyl-Berry curvature
  scenario. \n Binary phoshides are the ideal material class for a systemat
 ic study of Dirac and Weyl physics. Weyl points\, a new class of topologic
 al phases was also predicted in NbP\, NbAs. TaP\, MoP and WP2. [7-11]. New
  Fermions beyond Weyl and Dirac have been predicted by Bernevig’s team a
 nd can be classified by space groups and Wyckoff positions [12]. The new f
 ermion MoP and the Weyl semimetal WP2 show extremely low resistance despit
 e a high mobility. More emerging quantum properties and potential applicat
 ions will be discussed.\n\n# _Tanja Graf\, Stuart S. P. Parkin\, and Claud
 ia Felser\, Progress in Solid State Chemistry 39 (2011) 1_\n# _S. Chadov\,
  X. Qi\, J. Kübler\, G. H. Fecher\, C. Felser\, S.-C. Zhang\, Nature Mat.
  9 (2010) 541_\n# _H. Lin\, et al.\, Nature Mat. 9 (2010) 546_\n# _M. Hirs
 chberger et al.\, Nature Mat. 15\, (2016) 1161_\n# _C. Shekhar\,  et al.\,
  preprint: arXiv: 1604.01641_\n# _Z. K. Liu\, et al.\, Nature Communicatio
 n 7 (2016) 12924_\n# _C. Shekhar\, et al.\, Nature Physics 11 (2015) 645_ 
 \n# _Z. K. Liu\, et al.\, Nature Mat. 15 (2016) 27_ \n# _L. Yang\, et al.\
 , Nature Physics 11 (2015) 728_\n# _C. Shekhar\,  et al. preprint arXiv:17
 03.03736_\n# _N. Kumar\, et al. preprint arXiv:1703.04527_\n# _B. Bradlyn\
 , et al.\, Science 353 (2016) aaf5037_  \n\n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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