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Research Article

Larger in-plane upper critical field and superconducting diode effect observed in topological superconductor candidate InNbS2 nanoribbons

Bo Zheng1,§, Changlong Wang1,§, Xukun Feng2,§, Xiaozhen Sun3, Shasha Wang1, Dawei Qiu4, Xiang Ma1, Ruimin Li1, Guanglei Cheng4, Lan Wang5, Yalin Lu1, Peng Li3, Shengyuan A. Yang6, Bin Xiang1( )
Department of Materials Science and Engineering, CAS Key Lab of Materials for Energy Conversion, Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei 230026, China
Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
School of Microelectronics, University of Science and Technology of China, Hefei 230052, China
CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
Lab of Low Dimensional Magnetism and Spintronic Devices, School of Physics, Hefei University of Technology, Hefei 230009, China
Research Laboratory for Quantum Materials, IAPME, University of Macau, Macau, China

§ Bo Zheng, Changlong Wang, and Xukun Feng contributed equally to this work.

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Graphical Abstract

The in-plane upper critical field of InNbS2 nanoribbon exceeds the Pauli paramagnetic limit by 2.2 times. In addition, it exhibits excellent characteristics of a superconducting diode.

Abstract

Recently, the coexistence of topology and superconductivity has garnered considerable attention. Specifically, the dimensionality of these materials is crucial for the realization of topological quantum computation. However, the naturally grown materials, especially with one-dimensional feature that exhibits the coexistence of topology and superconductivity, still face challenges in terms of experimental realization and scalability, which hinders the fundamental research development and the potential to revolutionize quantum computing. Here, we report the first experimental synthesis of quasi-one-dimensional InNbS2 nanoribbons that exhibit the coexistence of topological order and superconductivity via a chemical vapor transport method. Especially, the in-plane upper critical field of InNbS2 nanoribbons exceeds the Pauli paramagnetic limit by more than 2.2 times, which can be attributed to the enhanced spin-orbit coupling and the weakened interlayer interaction between the NbS2 layers induced by the insertion of In atoms, making InNbS2 exhibit spin-momentum locking similar to that of monolayer NbS2. Moreover, for the first time, we report the superconducting diode effect in a quasi-one-dimensional superconductor system without any inherent geometric imperfections. The measured maximum efficiency is manifested as 14%, observed at μ0H ≈ ±60 mT, and we propose that the superconducting diode effect can potentially be attributed to the presence of the nontrivial topological band. Our work provides a platform for studying exotic phenomena in condensed matter physics and potential applications in quantum computing and quantum information processing.

Keywords

topological ordersuperconductivitynanoribbonsuperconducting anisotropysuperconducting diode

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Nano Research
Volume 17 Issue 7,
July 2024
Pages 6686-6694
DOI: 10.1007/s12274-024-6599-0
Cite this article:
Zheng B, Wang C, Feng X, et al. Larger in-plane upper critical field and superconducting diode effect observed in topological superconductor candidate InNbS2 nanoribbons. Nano Research, 2024, 17(7): 6686-6694. https://doi.org/10.1007/s12274-024-6599-0
Topics:
Nanoribbons

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Received: 16 January 2024
Revised: 16 February 2024
Accepted: 29 February 2024
Published: 17 April 2024
© Tsinghua University Press 2024
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