Phase Separation of Dirac Electrons in Topological Insulators at the Spatial Limit

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• 作者：Carolina ParraThiago Henrique Rodrigues da Cunha ; Alex W. Contryman ; Desheng Kong ; Francisco Montero-Silva ; Pedro Henrique Rezende Gonçalves ; Diogo Duarte Dos Reis ; Paula Giraldo-Gallo ; Rodrigo Segura ; Fernanda OlivaresFrancis Niestemski ; Yi Cui ; Rogerio Magalhaes-Paniago ; Hari C. Manoharan
• 刊名：Nano Letters
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：17
• 期：1
• 页码：97-103
• 全文大小：519K
• ISSN：1530-6992

文摘

In this work we present unique signatures manifested by the local electronic properties of the topological surface state in Bi₂Te₃ nanostructures as the spatial limit is approached. We concentrate on the pure nanoscale limit (nanoplatelets) with spatial electronic resolution down to 1 nm. The highlights include strong dependencies on nanoplatelet size: (1) observation of a phase separation of Dirac electrons whose length scale decreases as the spatial limit is approached, and (2) the evolution from heavily n-type to lightly n-type surface doping as nanoplatelet thickness increases. Our results show a new approach to tune the Dirac point together with reduction of electronic disorder in topological insulator (TI) nanostructured systems. We expect our work will provide a new route for application of these nanostructured Dirac systems in electronic devices.