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We present low-temperature magnetoconductance measurements onBi$_{1.5}$Sb$_{0.5}$Te$_{1.8}$Se$_{1.2}$ kinks with ribbon-shaped legs. Theconductance displays a clear dependence on the in-plane magnetic fieldorientation. The conductance modulation is consistent with orbitaleffect-driven trapping of the topological surface states on different sidefacets of the legs of the kink, which affects their transmission across thekink. This magnetic field-driven trapping and conductance pattern can beexplained with a semiclassical picture and is supported by quantum transportsimulations. The interpretation is corroborated by varying the angle of thekink and analyzing the temperature dependence of the observedmagnetoconductance pattern, indicating the importance of phase coherence alongthe cross section perimeter of the kink legs.

In-plane magnetic field-driven conductance modulations in topological insulator kinks