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Higher-Order Topology in the Superconducting State of Nodal-Line Spin-Gapless Semimetals

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Abstract

We study the topological properties of a nodal-line spin gapless semimetal superconductor. In the normal state, the low energy states are completely spin polarized so that the \(p+ip\)-wave pairing symmetry is considered. In the superconducting state, the energy bands are fully gapped in both the system bulk and at the system surface. However, when two open boundaries are considered, the gapless states emerge at the system hinges, indicating that the system is actually a higher-order topological superconductor.

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Acknowledgements

This work was supported by the NSFC (Grant No. 12074130), the Natural Science Foundation of Guangdong Province (Grant No. 2021A1515012340) and Science and Technology Program of Guangzhou (Grant No. 2019050001 and No. 202102080434).

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Authors and Affiliations

  1. Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, 510006, Guangzhou, China

    Ziying Ou & Tao Zhou

  2. Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics, South China Normal University, 510006, Guangzhou, China

    Ziying Ou & Tao Zhou

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  1. Ziying Ou
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  2. Tao Zhou
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Correspondence to Tao Zhou.

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Ou, Z., Zhou, T. Higher-Order Topology in the Superconducting State of Nodal-Line Spin-Gapless Semimetals. J Supercond Nov Magn 34, 3125–3130 (2021). https://doi.org/10.1007/s10948-021-06022-6

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  • DOI: https://doi.org/10.1007/s10948-021-06022-6

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