  Recently, it has been theoretically predicted that Cd3As2 is a three
dimensional Dirac material, a new topological phase discovered after
topological insulators, which exhibits a linear energy dispersion in the bulk
with massless Dirac fermions. Here, we report on the low-temperature
magnetoresistance measurements on a ~50nm-thick Cd3As2 film. The weak
antilocalization under perpendicular magnetic field is discussed based on the
two-dimensional Hikami-Larkin-Nagaoka (HLN) theory. The electron-electron
interaction is addressed as the source of the dephasing based on the
temperature-dependent scaling behavior. The weak antilocalization can be also
observed while the magnetic field is parallel to the electric field due to the
strong interaction between the different conductance channels in this
quasi-two-dimensional film.
