Observation of pseudo two dimensional electron transport in the rock   salt type topological semimetal LaBi
  Topological insulators are characterized by an inverted band structure in the bulk and metallic surface states on the surface. In LaBi, a semimetal with a band inversion equivalent to a topological insulator, we observe surface state like behavior in the magnetoresistance. The electrons responsible for this pseudo two dimensional transport, however, originate from the bulk states rather topological surface states, which is witnessed by the angle dependent quantum oscillations of the magnetoresistance and ab initio calculations. As a consequence, the magnetoresistance exhibits strong anisotropy with large amplitude (~ 10^5 %). 
Nitesh Kumar, Chandra Shekhar, Shu-Chun Wu, Inge Leermakers, Olga   Young, Uli Zeitler, Binghai Yan and Claudia Felser
cond-mat.mtrl-sci