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arXiv · 1804.04313

Oscillating planar Hall response from the surface electrons in bulk crystal Sn doped Bi1.1Sb0.9Te2S

Bin Wu·Xing-Chen Pan·Wenkai Wu·Fucong Fei·Bo Chen·Qianqian Liu·Haijun Bu·Lu Cao·Fengqi Song·Baigeng Wang
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Abstract

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

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Bin Wu, Xing-Chen Pan, Wenkai Wu, Fucong Fei, Bo Chen, Qianqian Liu, Haijun Bu, Lu Cao, Fengqi Song, Baigeng Wang. 2018-04-12. Oscillating planar Hall response from the surface electrons in bulk crystal Sn doped Bi1.1Sb0.9Te2S. https://arxiv.org/abs/1804.04313

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