We predict two topological phase transitions for cadmium arsenide (\ce{Cd3As2}) thin films under in-plane magnetic field, taking advantage of a four-band k⋅p model and effective g factors calculated from first principles. Film thickness, growth direction and in-plane Zeeman coupling strength can all serve as control parameters to drive these phase transitions. For (001) oriented \ce{Cd3As2} thin films, a two dimensional Weyl semimetal phase protected by C2zT symmetry can be realized using an in-plane magnetic field, which has recently been reported in our companion paper. We then put forth two pathways to achieve in-plane anomalous Hall effects (IPAHE). By either introducing a trigonal warping term or altering the growth orientation, the emergent C2zT symmetry can be broken. Consequently, in the clean limit and at low temperatures, quantized Hall plateaus induced by in-plane Zeeman fields become observable.
@article{arxiv.2309.15457,
title = {Engineering the in-plane anomalous Hall effect in Cd$_3$As$_2$ thin films},
author = {Wangqian Miao and Binghao Guo and Susanne Stemmer and Xi Dai},
journal= {arXiv preprint arXiv:2309.15457},
year = {2025}
}