Taishi Chen, Junhao Han, Zhaoguo Li, Fengqi Song, Bo Zhao, Xuefeng Wang, Baigeng Wang, Jianguo Wan, Min Han, Rong Zhang, Guanghou Wang
Metallic Bi2Te3 crystalline sheets with the room-temperature resistivity of above 10 m{\Omega} cm were prepared and their magnetoresistive transport was measured in a field of up to 9 Tesla. The Shubnikov de Haas oscillations were identified from the secondly-derived magnetoresistance curves. While changing the angle between the field and normal axis of the sheets, we find that the oscillation periods present a cosine dependence on the angle. This indicates a two-dimensional transport due to the surface state. The work reveals a resolvable surface contribution to the overall conduction even in a metallic topological insulator.
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http://arxiv.org/abs/1305.3747
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