thin films

Topological Dirac semimetal (DSM) Cd₃As₂, stabilized through the band inversion and the symmetry protection, provides a useful platform not only for investigating Weyl physics such as chiral anomaly, but also for pursuing topological phase transitions originating from DSM. Among others, chemical doping to control strength of the spin-orbit interaction is one effective way to modulate the band structure. In the case of Cd₃As₂, chemical doping of Zn is expected to suppress the band inversion of Cd₃As₂, leading to a transition from the DSM phase to a trivial insulator phase. In this context, we discuss magnetotransport of high quality (Cd_1-xZn_x)₃As₂ thin films under high magnetic fields. Especially when the field is aligned to the current, the longitudinal magnetoresistance exhibits a clear Zn-concentration dependence, changing from negative to positive. Along with analysis of transport properties such as Fermi velocity, effective mass, and scattering times, we have clarified details of the topological phase transition in (Cd_1-xZn_x)₃As₂.