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<p>The interplay between topology and superconductivity generated great interest in condensed matter physics. Here, we unveil an unconventional two-dimensional superconducting state in the Dirac nodal line semimetal ZrAs<sub>2</sub> which is exclusively confined to the top and bottom surfaces within the crystal’s <i>ab</i> plane. As a remarkable consequence, we present the first clear evidence of a Berezinskii–Kosterlitz–Thouless (BKT) transition occurring solely on a material’s surface—specifically, ZrAs₂—unlike the inconsistent reports on PtBi₂, CaAgP, and CaAg₁₋ₓPdₓP. Furthermore, we find that these same surfaces also host a two-dimensional van Hove singularity near the Fermi energy. This leads to enhanced electronic correlations that contribute to the stabilization of superconductivity at the surface of ZrAs<sub>2</sub>. The`surface-confined nature of the van Hove singularity and associated superconductivity, realized for the first time, allows exploring the interplay between low-dimensional quantum topology and superconductivity in a bulk material without resorting to the superconducting proximity effect.</p>

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Superconductivity and a van Hove singularity confined to the surface of a topological semimetal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月29日

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  • Md Shafayat Hossain,
  • Rajibul Islam,
  • Zi-Jia Cheng,
  • Zahir Muhammad,
  • Qi Zhang,
  • Zurab Guguchia,
  • Jonas A. Krieger,
  • Brian Casas,
  • Yu-Xiao Jiang,
  • Maksim Litskevich,
  • Xian P. Yang,
  • Byunghoon Kim,
  • Tyler A. Cochran,
  • Ilias E. Perakis,
  • Thomas Hicken,
  • Hubertus Luetkens,
  • Fei Xue,
  • Mehdi Kargarian,
  • Weisheng Zhao,
  • Luis Balicas,
  • M. Zahid Hasan

摘要

The interplay between topology and superconductivity generated great interest in condensed matter physics. Here, we unveil an unconventional two-dimensional superconducting state in the Dirac nodal line semimetal ZrAs2 which is exclusively confined to the top and bottom surfaces within the crystal’s ab plane. As a remarkable consequence, we present the first clear evidence of a Berezinskii–Kosterlitz–Thouless (BKT) transition occurring solely on a material’s surface—specifically, ZrAs₂—unlike the inconsistent reports on PtBi₂, CaAgP, and CaAg₁₋ₓPdₓP. Furthermore, we find that these same surfaces also host a two-dimensional van Hove singularity near the Fermi energy. This leads to enhanced electronic correlations that contribute to the stabilization of superconductivity at the surface of ZrAs2. The`surface-confined nature of the van Hove singularity and associated superconductivity, realized for the first time, allows exploring the interplay between low-dimensional quantum topology and superconductivity in a bulk material without resorting to the superconducting proximity effect.