Electron-hole asymmetry, Dirac fermions, and quantum magnetoresistance   in BaMnBi2
  We report two-dimensional quantum transport and Dirac fermions in BaMnBi2 single crystals. BaMnBi2 is a layered bad metal with highly anisotropic conductivity and magnetic order below 290 K. Magnetotransport properties, nonzero Berry phase, small cyclotronmass, and the first-principles band structure calculations indicate the presence of Dirac fermions in Bi square nets. Quantum oscillations in the Hall channel suggest the presence of both electron and hole pockets, whereas Dirac and parabolic states coexist at the Fermi level. 
Lijun Li, Kefeng Wang, D. Graf, Limin Wang, Aifeng Wang and C.   Petrovic
cond-mat.mtrl-sci cond-mat.mes-hall cond-mat.str-el