Discovery of Superconductivity in 2M WS2 with Possible Topological Surface States,Advanced Materials

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Discovery of Superconductivity in 2M WS2 with Possible Topological Surface States
Advanced Materials ( IF 27.4 ) Pub Date : 2019-06-03 , DOI: 10.1002/adma.201901942
Yuqiang Fang _{1,

2,

3} , Jie Pan ₁ , Dongqin Zhang _{4,

5} , Dong Wang ₁ , Hishiro T. Hirose ₆ , Taichi Terashima ₆ , Shinya Uji ₆ , Yonghao Yuan _{7,

8} , Wei Li _{7,

8} , Zhen Tian ₉ , Jiamin Xue ₉ , Yonghui Ma ₁₀ , Wei Zhao ₁ , Qikun Xue _{7,

8} , Gang Mu ₁₀ , Haijun Zhang _{4,

5} , Fuqiang Huang _{1,

2}

Affiliation

State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of Science Shanghai 200050 P. R. China
State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking University Beijing 100871 P. R. China
University of Chinese Academy of Sciences Beijing 100049 P. R. China
National Laboratory of Solid State Microstructures and School of PhysicsNanjing University Nanjing 210093 P. R. China
Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 P. R. China
National Institute for Materials Science Tsukuba Ibaraki 305‐0003 Japan
State Key Laboratory of Low‐Dimensional Quantum PhysicsDepartment of PhysicsTsinghua University Beijing 100084 P. R. China
Collaborative Innovation Center of Quantum Matter Beijing 100084 P. R. China
School of Physical Science and TechnologyShanghaiTech University Shanghai 201210 P. R. China
State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences Shanghai 200050 P. R. China

Recently the metastable 1T′‐type VIB‐group transition metal dichalcogenides (TMDs) have attracted extensive attention due to their rich and intriguing physical properties, including superconductivity, valleytronics physics, and topological physics. Here, a new layered WS₂ dubbed “2M” WS₂, is constructed from 1T′ WS₂ monolayers, is synthesized. Its phase is defined as 2M based on the number of layers in each unit cell and the subordinate crystallographic system. Intrinsic superconductivity is observed in 2M WS₂ with a transition temperature T_c of 8.8 K, which is the highest among TMDs not subject to any fine‐tuning process. Furthermore, the electronic structure of 2M WS₂ is found by Shubnikov–de Haas oscillations and first‐principles calculations to have a strong anisotropy. In addition, topological surface states with a single Dirac cone, protected by topological invariant Z₂, are predicted through first‐principles calculations. These findings reveal that the new 2M WS₂ might be an interesting topological superconductor candidate from the VIB‐group transition metal dichalcogenides.

中文翻译：

在可能具有拓扑表面状态的2M WS2中发现超导性

近来，亚稳的1T'型VIB-族过渡金属二硫化碳（TMDs）由于其丰富而有趣的物理特性（包括超导性，谷电子物理和拓扑物理）而受到了广泛的关注。在此，合成了由1T'WS ₂单层构造的称为“ 2M” WS ₂的新分层WS ₂。根据每个晶胞和从属晶体学系统中的层数，将其相定义为2M。在2M WS _2中观察到本征超导性，其转变温度T _c为8.8 K，这是未经任何微调过程的TMD中最高的。此外，2M WS ₂的电子结构Shubnikov-de Haas振荡和第一性原理计算发现具有很强的各向异性。此外，通过第一性原理计算可预测具有单个Dirac锥并受拓扑不变量Z ₂保护的拓扑表面状态。这些发现表明，新的2M WS ₂可能是VIB-族过渡金属二卤化物中有趣的拓扑超导体候选物。

更新日期：2019-06-03

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