Ballistic superconductivity in semiconductor nanowires

H. Zhang, Önder Gül, Sonia Conesa-Boj, Michał P. Nowak, M.T. Wimmer, Kun Zuo, Vincent Mourik, Folkert K. De Vries, Jasper Van Veen, Michiel W.A. De Moor, Jouri D.S. Bommer, David J. Van Woerkom, Diana Car, Sébastien R. Plissard, Erik P.A.M. Bakkers, Marina Quintero-Pérez, Maja C. Cassidy, Sebastian Koelling, Srijit Goswami, Kenji WatanabeTakashi Taniguchi, Leo P. Kouwenhoven

Research output: Contribution to journalArticleScientificpeer-review

118 Citations (Scopus)
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Abstract

Semiconductor nanowires have opened new research avenues in quantum transport owing to their confined geometry and electrostatic tunability. They have offered an exceptional testbed for superconductivity, leading to the realization of hybrid systems combining the macroscopic quantum properties of superconductors with the possibility to control charges down to a single electron. These advances brought semiconductor nanowires to the forefront of efforts to realize topological superconductivity and Majorana modes. A prime challenge to benefit from the topological properties of Majoranas is to reduce the disorder in hybrid nanowire devices. Here we show ballistic superconductivity in InSb semiconductor nanowires. Our structural and chemical analyses demonstrate a high-quality interface between the nanowire and a NbTiN superconductor that enables ballistic transport. This is manifested by a quantized conductance for normal carriers, a strongly enhanced conductance for Andreev-reflecting carriers, and an induced hard gap with a significantly reduced density of states. These results pave the way for disorder-free Majorana devices.

Original languageEnglish
Article number16025
JournalNature Communications
Volume8
DOIs
Publication statusPublished - 6 Jul 2017

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