The newly discovered topological Dirac semimetals host the possibilities of various topological phase transitions through the control of spin-orbit coupling as well as symmetries and dimensionalities. Here, we report a magnetotransport study of high-mobility (Cd1-xZnx)3As2 films, where the topological Dirac semimetal phase can be turned into a trivial insulator via chemical substitution. By high-field measurements with a Hall-bar geometry, magnetoresistance components ascribed to the chiral charge pumping have been distinguished from other extrinsic effects. The negative magnetoresistance exhibits a clear suppression upon Zn doping, reflecting decreasing Berry curvature of the band structure as the topological phase transition is induced by reducing the spin-orbit coupling.
@article{arxiv.1806.02302,
title = {Negative magnetoresistance suppressed through topological phase transition in (Cd1-xZnx)3As2 films},
author = {S. Nishihaya and M. Uchida and Y. Nakazawa and K. Akiba and M. Kriener and Y. Kozuka and A. Miyake and Y. Taguchi and M. Tokunaga and M. Kawasaki},
journal= {arXiv preprint arXiv:1806.02302},
year = {2018}
}