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Quantum confinement of the Dirac surface states in topological-insulator nanowires by Münning, Felix (author);Breunig, Oliver (author);Legg, Henry F. (author);Roitsch, Stefan (author);Fan, Dingxun (author);Rößler, Matthias (author);Rosch, Achim (author);Ando, Yoichi (author) is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Quantum confinement of the Dirac surface states in topological-insulator nanowires about?

## Abstract The non-trivial topology of three-dimensional topological insulators dictates the appearance of gapless Dirac surface states. Intriguingly, when made into a nanowire, quantum confinement leads to a peculiar gapped Dirac sub-band structure. This gap is useful for, e.g., future Majorana qubits based on TIs. Furthermore, these sub-bands can be manipulated by a magnetic flux and are an ideal platform for generating stable Majorana zero modes, playing a key role in topological quantum computing. However, direct evidence for the Dirac sub-bands in TI nanowires has not been reported so far. Here, using devices fabricated from thin bulk-insulating (Bi~1−x~Sb~x~)~2~Te~3~ nanowires we show that non-equidistant resistance peaks, observed upon gate-tuning the chemical potential across the Dirac point, are the unique signatures of the quantized sub-bands. These TI nanowires open the way to address the topological mesoscopic physics, and eventually the Majorana physics when proximitized by an s-wave superconductor.

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Author

Münning, Felix (author);Breunig, Oliver (author);Legg, Henry F. (author);Roitsch, Stefan (author);Fan, Dingxun (author);Rößler, Matthias (author);Rosch, Achim (author);Ando, Yoichi (author)

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)