Title
Ballistic superconductivity in semiconductor nanowires
Author
Zhang, H. (TU Delft QRD/Kouwenhoven Lab)
Gül, Önder (TU Delft QRD/Kouwenhoven Lab) 
Conesa Boj, S. (TU Delft QN/Conesa-Boj Lab; Eindhoven University of Technology)
Nowak, M.P. (TU Delft QRD/Kouwenhoven Lab)
Wimmer, M.T. (TU Delft QRD/Wimmer Group; TU Delft Qubit Research Division)
Zuo, K. (TU Delft QRD/Kouwenhoven Lab)
Mourik, Vincent
de Vries, F.K. (TU Delft QRD/Kouwenhoven Lab)
van Veen, J. (TU Delft QRD/Kouwenhoven Lab)
de Moor, M.W.A. (TU Delft QRD/Kouwenhoven Lab)
Bommer, J.D.S. (TU Delft QRD/Kouwenhoven Lab)
van Woerkom, D.J. (TU Delft QRD/Kouwenhoven Lab)
Car, Diana (Eindhoven University of Technology)
Plissard, S.R. (Eindhoven University of Technology)
Bakkers, E.P.A.M. (TU Delft QN/Bakkers Lab; Eindhoven University of Technology)
Quintero Perez, M. (TU Delft BUS/General; TNO)
Cassidy, M.C. (TU Delft QRD/Kouwenhoven Lab)
Koelling, Sebastian (Eindhoven University of Technology)
Goswami, S. (TU Delft QRD/Goswami Lab)
Watanabe, Kenji (National Institute for Materials Science)
Taniguchi, Takashi (National Institute for Materials Science)
Kouwenhoven, Leo P. (TU Delft QRD/Kouwenhoven Lab; Microsoft Quantum Lab Delft)
Department
Qubit Research Division
Date
2017
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.
To reference this document use:
http://resolver.tudelft.nl/uuid:7225db63-3016-4aa2-a0dc-d5814dcc181c
DOI
https://doi.org/10.1038/ncomms16025
ISSN
2041-1723
Source
Nature Communications, 8
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2017 H. Zhang, Önder Gül, S. Conesa Boj, M.P. Nowak, M.T. Wimmer, K. Zuo, Vincent Mourik, F.K. de Vries, J. van Veen, M.W.A. de Moor, J.D.S. Bommer, D.J. van Woerkom, Diana Car, S.R. Plissard, E.P.A.M. Bakkers, M. Quintero Perez, M.C. Cassidy, Sebastian Koelling, S. Goswami, Kenji Watanabe, Takashi Taniguchi, Leo P. Kouwenhoven