We report the low-temperature magneto-transport in the bulk-insulating single crystal of topological insulator Sn doped Bi1.1Sb0.9Te2S. Shubnikov-de Haas oscillations appear with their reciprocal frequency proportional to cos θ, demonstrating the dominant transport of topological surface states. While the magnetic field rotates on the sample surface, the planar Hall effect arises with sizeable oscillations following a relation of cos θ sin θ. Its amplitude reaches the maximum at the lowest temperature and drops to nearly zero at temperature higher than 100 K. All these evidences consolidate such planar Hall oscillations as another golden criterion on the topological surface transport.We report the low-temperature magneto-transport in the bulk-insulating single crystal of topological insulator Sn doped Bi1.1Sb0.9Te2S. Shubnikov-de Haas oscillations appear with their reciprocal frequency proportional to cos θ, demonstrating the dominant transport of topological surface states. While the magnetic field rotates on the sample surface, the planar Hall effect arises with sizeable oscillations following a relation of cos θ sin θ. Its amplitude reaches the maximum at the lowest temperature and drops to nearly zero at temperature higher than 100 K. All these evidences consolidate such planar Hall oscillations as another golden criterion on the topological surface transport.

中文翻译：

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拓扑绝缘体 Sn 掺杂 Bi1.1Sb0.9Te2S 块体晶体中的振荡平面霍尔响应

我们报告了拓扑绝缘体 Sn 掺杂 Bi1.1Sb0.9Te2S 的体绝缘单晶中的低温磁传输。Shubnikov-de Haas 振荡的倒数频率与 cos θ 成正比，表明拓扑表面态的主要传输。当磁场在样品表面旋转时，平面霍尔效应会随着 cos θ sin θ 的关系产生相当大的振荡。它的振幅在最低温度下达到最大值，在高于 100 K 的温度下降至接近零。所有这些证据巩固了这种平面霍尔振荡作为拓扑表面传输的另一个黄金标准。我们报告了低温磁传输拓扑绝缘体Sn掺杂Bi1.1Sb0.9Te2S的体绝缘单晶。Shubnikov-de Haas 振荡的倒数频率与 cos θ 成正比，表明拓扑表面态的主要传输。当磁场在样品表面旋转时，平面霍尔效应会随着 cos θ sin θ 的关系产生相当大的振荡。它的振幅在最低温度下达到最大值，在温度高于 100 K 时下降到接近零。所有这些证据都巩固了这种平面霍尔振荡作为拓扑表面传输的另一个黄金标准。