Top-Down Fabrication of Bulk-Insulating Topological Insulator Nanowires for Quantum Devices
| Autor: | Matthias Rößler, Dingxun Fan, Felix Münning, Henry F. Legg, Andrea Bliesener, Gertjan Lippertz, Anjana Uday, Roozbeh Yazdanpanah, Junya Feng, Alexey Taskin, Yoichi Ando |
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| Rok vydání: | 2023 |
| Předmět: |
Superconductivity (cond-mat.supr-con)
Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity Mechanical Engineering Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Physical sciences General Materials Science Bioengineering General Chemistry Condensed Matter Physics |
| Zdroj: | Nano Letters. 23:2846-2853 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | In a nanowire (NW) of a three-dimensional topological insulator (TI), the quantum-confinement of topological surface states leads to a peculiar subband structure that is useful for generating Majorana bound states. Top-down fabrication of TINWs from a high-quality thin film would be a scalable technology with great design flexibility, but there has been no report on top-down-fabricated TINWs where the chemical potential can be tuned to the charge neutrality point (CNP). Here we present a top-down fabrication process for bulk-insulating TINWs etched from high-quality (Bi$_{1-x}$Sb$_{x}$)$_2$Te$_3$ thin films without degradation. We show that the chemical potential can be gate-tuned to the CNP and the resistance of the NW presents characteristic oscillations as functions of the gate voltage and the parallel magnetic field, manifesting the TI-subband physics. We further demonstrate the superconducting proximity effect in these TINWs, preparing the groundwork for future devices to investigate Majorana bound states. Comment: 32 pages. 22 main text, 10 SI |
| Databáze: | OpenAIRE |
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