Shubnikov de Haas quantum oscillation of the surface states in the metallic Bismuth Telluride sheets
Shubnikov de Haas quantum oscillation of the surface states in the metallic Bismuth Telluride sheets
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DOI：
10.1140/epjd/e2013-30536-5
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
Taishi Chen;Junhao Han;Zhaoguo Li;F. Song;B. Zhao;Xuefeng Wang;Baigeng Wang;J. Wan;Min Han-
中科院分区：
文献类型：
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作者：
Taishi Chen;Junhao Han;Zhaoguo Li;F. Song;B. Zhao;Xuefeng Wang;Baigeng Wang;J. Wan;Min Han-
制备了室温电阻率大于10 mΩ cm的金属Bi2Te3晶体薄片，并在高达9 T的磁场下测量了其磁阻输运特性。从二阶磁电阻曲线中发现了Shubnikov de哈斯振荡。当改变场与片法向轴之间的夹角时，我们发现振荡周期随夹角的变化呈余弦关系。这表明由于表面状态的二维传输。这项工作揭示了一个可分辨的表面贡献的整体传导，即使在金属拓扑绝缘体。
Metallic Bi2Te3crystalline sheets with the room-temperature resistivity of above 10 mΩ cm were prepared and their magnetoresistive transport was measured in a field of up to 9 T. 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.