Intrinsic surface p-wave superconductivity in layered AuSn4

Zhu，Wenliang1; Song，Rui2; Huang，Jierui3; Wang，Qi Wei4; Cao，Yuan1; Zhai，Runqing1; Bian，Qi5; Shao，Zhibin1; Jing，Hongmei1; Zhu，Lujun1; Hou，Yuefei6; Gao，Yu Hang4; Li，Shaojian5; Zheng，Fawei6; Zhang，Ping6,7; Pan，Mojun3; Liu，Junde3; Qu，Gexing3; Gu，Yadong3; Zhang，Hao1; Dong，Qinxin3; Huang，Yifei3; Yuan，Xiaoxia8; He，Junbao9; Li，Gang3,10,11; Qian，Tian3,10,11; Chen，Genfu3,10,11; Li，Shao Chun4; Pan，Minghu1,5; Xue，Qi Kun12,13,14

2023-12-01

10.1038/s41467-023-42781-7

Nature Communications   影响因子和分区

2041-1723

The search for topological superconductivity (TSC) is currently an exciting pursuit, since non-trivial topological superconducting phases could host exotic Majorana modes. However, the difficulty in fabricating proximity-induced TSC heterostructures, the sensitivity to disorder and stringent topological restrictions of intrinsic TSC place serious limitations and formidable challenges on the materials and related applications. Here, we report a new type of intrinsic TSC, namely intrinsic surface topological superconductivity (IS-TSC) and demonstrate it in layered AuSn with T of 2.4 K. Different in-plane and out-of-plane upper critical fields reflect a two-dimensional (2D) character of superconductivity. The two-fold symmetric angular dependences of both magneto-transport and the zero-bias conductance peak (ZBCP) in point-contact spectroscopy (PCS) in the superconducting regime indicate an unconventional pairing symmetry of AuSn. The superconducting gap and surface multi-bands with Rashba splitting at the Fermi level (E), in conjunction with first-principle calculations, strongly suggest that 2D unconventional SC in AuSn originates from the mixture of p-wave surface and s-wave bulk contributions, which leads to a two-fold symmetric superconductivity. Our results provide an exciting paradigm to realize TSC via Rashba effect on surface superconducting bands in layered materials.

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2-s2.0-85175729794

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1.School of Physics and Information Technology,Shaanxi Normal University,Xi’an,710119,China
2.Science and Technology on Surface Physics and Chemistry Laboratory,Mianyang,621908,China
3.Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences,Beijing,100190,China
4.National Laboratory of Solid State Microstructures,School of Physics,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing,210093,China
5.School of Physics,Huazhong University of Science and Technology,Wuhan,430074,China
6.Institute of Applied Physics and Computational Mathematics,Beijing,100088,China
7.School of Physics and Physical Engineering,Qufu Normal University,Qufu,273165,China
8.Shaanxi Applied Physics and Chemistry Research Institute,Xi’an,710061,China
9.College of Physics and Electronic Engineering,Nanyang Normal University,Nanyang,473061,China
10.School of Physical Sciences,University of Chinese Academy of Sciences,Beijing,100190,China
11.Songshan Lake Materials Laboratory,Dongguan,Guangdong,523808,China
12.State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing,100084,China
13.Beijing Academy of Quantum Information Sciences,Beijing,100193,China
14.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Zhu，Wenliang,Song，Rui,Huang，Jierui,et al. Intrinsic surface p-wave superconductivity in layered AuSn4[J]. Nature Communications,2023,14(1).

Zhu，Wenliang.,Song，Rui.,Huang，Jierui.,Wang，Qi Wei.,Cao，Yuan.,...&Xue，Qi Kun.(2023).Intrinsic surface p-wave superconductivity in layered AuSn4.Nature Communications,14(1).

Zhu，Wenliang,et al."Intrinsic surface p-wave superconductivity in layered AuSn4".Nature Communications 14.1(2023).