At the interface between two-dimensional materials with different topologies,topologically protected one-dimensional states (also named as zero-line modes)arise. Here, we focus on the quantum anomalous Hall effect based zero-linemodes formed at the interface between regimes with different Chern numbers. Wefind that, these zero-line modes are chiral and unilaterally conductive due tothe breaking of time-reversal invariance. For a beam splitter consisting of twointersecting zero lines, the chirality ensures that current can only beinjected from two of the four terminals. Our numerical results further showthat, in the absence of contact resistance, the (anti-)clockwise partitions ofcurrents from these two terminals are the same owing to the currentconservation, which effectively simplifies the partition laws. We find that thepartition is robust against relative shift of Fermi energy, but can beeffectively adjusted by tuning the relative magnetization strengths atdifferent regimes or relative angles between zero lines.
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