Evidence of both surface and bulk Dirac bands in ZrSiS and the   unconventional magnetoresistance
  The unconventional magnetoresistance of ZrSiS single crystals is found unsaturated till the magnetic field of 53 T with the butterfly shaped angular dependence. Intense Shubnikov-de Haas oscillations resolve a bulk Dirac cone with a nontrivial Berry phase, where the Fermi surface area is 1.80*10^-3 {\AA}-2 and reaches the quantum limit before 20 T. Angle resolved photoemission spectroscopy measurement reveals an electronic state with the two-dimensional nature around the X point of Brillouin zone boundary. By integrating the density functional theory calculations, ZrSiS is suggested to be a Dirac material with both surface and bulk Dirac bands. 
Xuefeng Wang, Xingchen Pan, Ming Gao, Jihai Yu, Juan Jiang, Junran   Zhang, Huakun Zuo, Minhao Zhang, Zhongxia Wei, Wei Niu,...
cond-mat.mtrl-sci