1. Phase-coherent loops in selectively-grown topological insulator nanoribbons.
- Author
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Kölzer, Jonas, Rosenbach, Daniel, Weyrich, Christian, Schmitt, Tobias W, Schleenvoigt, Michael, Jalil, Abdur Rehman, Schüffelgen, Peter, Mussler, Gregor, IV, Vincent E Sacksteder, Grützmacher, Detlev, Lüth, Hans, and Schäpers, Thomas
- Subjects
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TOPOLOGICAL insulators , *MOLECULAR beam epitaxy , *NANORIBBONS , *MAGNETIC field measurements , *FOURIER transforms , *MAGNETIC fields - Abstract
We succeeded in the fabrication of topological insulator (Bi0.57Sb0.43)2Te3 Hall bars as well as nanoribbons by means of selective-area growth using molecular beam epitaxy. By performing magnetotransport measurements at low temperatures information on the phase-coherence of the electrons is gained by analyzing the weak-antilocalization effect. Furthermore, from measurements on nanoribbons at different magnetic field tilt angles an angular dependence of the phase-coherence length is extracted, which is attributed to transport anisotropy and geometrical factors. For the nanoribbon structures universal conductance fluctuations were observed. By performing a Fourier transform of the fluctuation pattern a series of distinct phase-coherent closed-loop trajectories are identified. The corresponding enclosed areas can be explained in terms of nanoribbon dimensions and phase-coherence length. In addition, from measurements at different magnetic field tilt angles we can deduce that the area enclosed by the loops are predominately oriented parallel to the quintuple layers. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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