Phase-coherent transport in topological insulator nanocolumns and nanoribbons

Thomas Schäpers; Christian Weyrich; Daniel Rosenbach; Jonas Kölzer; Tobias Schmitt; Peter Schüffelgen; Gregor Mussler; Michael Schleenvoigt; Abdur Rehman Jalil; Hans Lüth; Detlev Grützmacher

doi:10.1117/12.2322720

20 September 2018 Phase-coherent transport in topological insulator nanocolumns and nanoribbons

Thomas Schäpers, Christian Weyrich, Daniel Rosenbach, Jonas Kölzer, Tobias Schmitt, Peter Schüffelgen, Gregor Mussler, Michael Schleenvoigt, Abdur Rehman Jalil, Hans Lüth, Detlev Grützmacher

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 107320V (2018) https://doi.org/10.1117/12.2322720
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

The transport properties of topological insulator nanostructures prepared by selective-area molecular beam epitaxy is investigated. For the nanocolumn structures based on Sb₂Te₃/Bi₂Te₃-heterostructures pronounced universal conductance fluctuations are observed in the magnetoconductance, indicating phase-coherent transport. Furthermore, angle-dependent measurements indicate that the phase coherent loops are mainly oriented parallel to the substrate plane. Measurements on nanoribbons based on (Bi_0.57Sb_0.43)₂Te₃ revealed a resistance dip due to weak antilocalization as well as universal conductance fluctuations. Here, we also found indications, that the phase-coherent loops are predominantly oriented parallel to the quintuple layers forming the topological insulator.

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Thomas Schäpers, Christian Weyrich, Daniel Rosenbach, Jonas Kölzer, Tobias Schmitt, Peter Schüffelgen, Gregor Mussler, Michael Schleenvoigt, Abdur Rehman Jalil, Hans Lüth, and Detlev Grützmacher "Phase-coherent transport in topological insulator nanocolumns and nanoribbons", Proc. SPIE 10732, Spintronics XI, 107320V (20 September 2018); https://doi.org/10.1117/12.2322720

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