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arXiv 1611.00564cond-mat.mtrl-sci
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Bi2Se3一维纳米线的FIB合成证明了Shubnikov-de Haas振荡和线性磁阻的共存

FIB synthesis of Bi2Se3 1D nanowires demonstrating the co-existence of Shubnikov-de Haas oscillations and linear magnetoresistance

Biplab Bhattacharyya, Alka Sharma, V P S Awana, T. D. Senguttuvan, Sudhir Husale

摘要:

自从拓扑绝缘体(TI)被发现以来,人们对金属表面态及其对背散射的屏蔽特性以及通过制备纳米器件来研究其纳米尺度下的性质产生了极大的兴趣。在这里,我们解决了一个重要的科学问题,有关TI是否可以清楚地证明拓扑表面状态(TSS)的鲁棒性存在的障碍,不打破任何基本的对称性。FIB研磨的简单直接的方法被用来合成Bi 2Se 3的纳米线,我们认为这是一个有趣的路线来测试TSS的鲁棒性,并获得的结果是新的相比,许多早期的论文在TI的量子传输证明金属SS的镓掺杂的鲁棒性。在垂直磁场作用下,我们观察到了Shubnikov de Haas振荡和线性磁电阻的共存,并对不同沟道长度下的线性磁电阻进行了系统的研究。这里所示的传输特性和估计的物理参数表明SS的制造工具的鲁棒性,触发灵活性,以探索新的奇异量子现象在纳米器件水平。

英文摘要:

Since the discovery of topological insulators (TI), there are considerable interests in demonstrating metallic surface states, their shielded robust nature to the backscattering and study their properties at nanoscale dimensions by fabricating nanodevices. Here we address an important scientific issue related to TI whether one can clearly demonstrate the robustness of topological surface states (TSS) to the presence of disorder that does not break any fundamental symmetry. The simple straightforward method of FIB milling was used to synthesize nanowires of Bi2Se3 which we believe an interesting route to test robustness of TSS and obtained results are new compared to many of the earlier papers on quantum transport in TI demonstrating robustness of metallic SS to gallium doping. In presence of perpendicular magnetic field, we have observed the co-existence of Shubnikov de Haas oscillations and linear magnetoresistance which was systematically investigated at different channel lengths indicating the Dirac dispersive surface states. The transport properties and estimated physical parameters shown here demonstrate the robustness of SS to the fabrication tools triggering flexibility to explore new exotic quantum phenomena at nanodevice level.

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