Crossover from 3D to 2D Quantum Transport in Bi2Se3/In2Se3 Superlattices

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• 作者：Yanfei Zhao ; Haiwen Liu ; Xin Guo ; Ying Jiang ; Yi Sun ; Huichao Wang ; Yong Wang ; Han-Dong Li ; Mao-Hai Xie ; Xin-Cheng Xie ; Jian Wang
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：September 10, 2014
• 年：2014
• 卷：14
• 期：9
• 页码：5244-5249
• 全文大小：364K
• ISSN：1530-6992

文摘

The topological insulator/normal insulator (TI/NI) superlattices (SLs) with multiple Dirac channels are predicted to offer great opportunity to design novel materials and investigate new quantum phenomena. Here, we report first transport studies on the SLs composed of TI Bi₂Se₃ layers sandwiched by NI In₂Se₃ layers artificially grown by molecular beam epitaxy (MBE). The transport properties of two kinds of SL samples show convincing evidence that the transport dimensionality changes from three-dimensional (3D) to two-dimensional (2D) when decreasing the thickness of building block Bi₂Se₃ layers, corresponding to the crossover from coherent TI transport to separated TI channels. Our findings provide the possibility to realizing 鈥?D surface states鈥?in TI/NI SLs.

Keywords:

topological insulators; superlattices; transport dimensionality; weak-localization; weak-antilocalization