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SUMMARY:Topological Kondo semimetals  - Prof. Huiqiu Yuan: Center for corr
 elated Matter and Department of Physics\, Zhejiang University
DTSTART:20180928T101500Z
DTEND:20180928T113000Z
UID:TALK110989@talks.cam.ac.uk
CONTACT:Romy Hall
DESCRIPTION:In this presentation\, we will report our recent progress on s
 tudying the topological properties of the correlated  semimetals YbPtBi an
 d RX (R = Ce\, Pr\, Sm\; X=Sb\, Bi). \nEvidence for Weyl fermions has also
  been found in the heavy fermion semimetal YbPtBi. At higher temperatures 
 where the Kondo interaction is weaker\, the presence of Weyl fermions is i
 nferred from the chiral anomaly in magnetotransport measurements\, as well
  as the ARPES measurements and DFT calculations [1]. Upon lowering tempera
 ture\, the Kondo interaction between the 4f electrons and conduction elect
 rons is strengthened and therefore the electronic bands are renormalized. 
 As a result\, the contributions of chiral anomaly to the magnetotransport 
 become negligible in the heavy fermion state. Instead\, we obtained eviden
 ce for Weyl fermions at low temperatures  from the measurements of specifi
 c heat and topological Hall effect. [1]. These results demonstrate that th
 e Weyl fermion state is modified upon increasing the hybridization strengt
 h\, providing a good opportunity to study the relationship between topolog
 ic states\, electron-electron correlations and quantum criticality.\nThe R
 X family of materials show very large magnetoresistance. Both trivial and 
 non-trivial band topologies are observed in these compounds [2]. Angular d
 ependent magnetoresistance measurements and band structure calculations pr
 ovide evidence for Weyl fermions in the field-induced ferromagnetic state 
 of CeSb [3]. In PrSb a trivial topology is revealed [4]\, whereas evidence
  for a non-trivial topology is found in SmSb\, which quantum oscillations 
 show anomalous behavior [5]. \n\n[1] C. Y. Guo et al.\, arXiv: 1710.05522
 ， Nat. Commun. (accepted).\n[2] P. Li et al.\, Phys.  Rev. B 98\, 085103
  (2018)\; X. Duan  et al.\, arXiv: 1802.04554\n[3] C. Y. Guo et. al.\, npj
  Quantum Materials 2\, 39 (2017).\n[4] F. Wu et al.\, Phys. Rev. B 96\, 12
 5122 (2018).\n[5] F. Wu et al.\, arXiv: 1807.03070 (2018).\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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