One-dimensional edge transport on the surface of cylindrical BixTe3-ySey nanowires in transverse magnetic fields
One-dimensional edge transport on the surface of cylindrical BixTe3-ySey nanowires in transverse magnetic fields
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DOI：
10.1063/1.4935244
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发表时间：
2015-11-02
影响因子：
4
通讯作者：
Nielsch, Kornelius
中科院分区：
文献类型：
--
作者：
Baessler, Svenja;Hamdou, Bacel;Nielsch, Kornelius
拓扑绝缘体（TI）的几何形状对其表面态的磁电能带结构有着重要的影响。在这里，我们研究了三种不同直径的圆柱形TI碲化硒化铋纳米线的表面状态，通过平行和横向磁阻（MR）测量。在平行配置中，我们观察到Aharonov-Bohm振荡以及弱的反局域化，表明二维TI表面态。在横向磁场中，我们观察到的MR振荡是对磁场的倒数非线性，因此不能用二维或三维状态来解释。相反，我们的运输数据分析表明，这些MR振荡的结果是一维边缘通道的纳米线表面，形成由于在高磁场的圆柱形弯曲的表面平面上的外部磁场的投影。我们的观察提供了一个外来类的表面状态，可能用于电子和自旋电子器件。(C)2015 AIP Publishing LLC.
The geometry of topological insulators (TIs) has a major impact on the magnetoelectric band structure of their surface states. Here, we investigate the surface states of cylindrical TI bismuth telluride selenide nanowires with three different diameters, by parallel and transverse magnetoresistance (MR) measurements. In parallel configuration, we observe Aharonov-Bohm oscillations as well as weak antilocalization, indicating two-dimensional TI surface states. In transverse magnetic fields, we observed MR oscillations that are non-linear against the reciprocal of the magnetic field and thus cannot be explained by two-or three-dimensional states. Instead, our transport data analysis reveals that these MR oscillations are the consequence of one-dimensional edge channels at the nanowire surface that form due to the projection of the external magnetic field on the cylindrically curved surface plane in high magnetic fields. Our observation provides an exotic class of surface states that might be used for electronic and spintronic devices. (C) 2015 AIP Publishing LLC.