We present low-temperature magnetoconductance measurements on ${\mathrm{Bi}}_{1.5}{\mathrm{Sb}}_{0.5}{\mathrm{Te}}_{1.8}{\mathrm{Se}}_{1.2}$ kinks with ribbon-shaped legs. The conductance displays a clear dependence on the in-plane magnetic field orientation. The conductance modulation is consistent with orbital effect-driven trapping of the topological surface states on different side facets of the legs of the kink, which affects their transmission across the kink. This magnetic field driven trapping and conductance pattern can be explained with a semiclassical picture and is supported by quantum transport simulations. The interpretation is corroborated by varying the angle of the kink and analyzing the temperature dependence of the observed magnetoconductance pattern, indicating the importance of phase coherence along the cross-section perimeter of the kink legs.

中文翻译：

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拓扑绝缘体扭结中的面内磁场驱动电导调制

我们提出了低温磁导测量${双}_{1.5}{锑}_{0.5}{碲}_{1.8}{硒}_{1.2}$与带状腿扭结。电导显示出对面内磁场方向的明显依赖性。电导调制与轨道效应驱动的扭结腿不同侧面上拓扑表面状态的捕获一致，这影响了它们在扭结上的传输。这种磁场驱动的捕获和电导模式可以用半经典图来解释，并得到量子输运模拟的支持。通过改变扭结角度并分析观察到的磁导图案的温度依赖性，证实了这一解释，表明沿扭结腿横截面周长的相位相干性的重要性。