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Discovery of Superconductivity in 2M WS_2 with Possible Topological Surface States

机译：在具有可能的拓扑表面状态的2M WS_2中发现超导性

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摘要

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 Z(2), 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.
机译：近来，亚稳的1T'型VIB-族过渡金属二硫化二氢（TMDs）由于其丰富而有趣的物理特性（包括超导性，谷电子学和拓扑物理）而受到了广泛的关注。在这里，合成了一个新的称为“ 2M” WS2的分层WS2，它是由1T'WS2单层构造而成的。根据每个晶胞和从属晶体学系统的层数，将其相定义为2M。在2M WS2中观察到本征超导性，其转变温度T-c为8.8 K，在未经任何微调过程的TMD中是最高的。此外，通过Shubnikov-de Haas振荡和第一性原理计算发现2M WS2的电子结构具有很强的各向异性。此外，通过第一性原理计算可以预测具有单个Dirac锥的拓扑表面状态，并受拓扑不变式Z（2）保护。这些发现表明，新的2M WS2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。

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  • 来源
    《Advanced Materials》 |2019年第30期|1901942.1-1901942.7|共7页
  • 作者

    Fang Yuqiang; Pan Jie; Zhang Dongqin; Wang Dong; Hirose Hishiro T.; Terashima Taichi; Uji Shinya; Yuan Yonghao; Li Wei; Tian Zhen; Xue Jiamin; Ma Yonghui; Zhao Wei; Xue Qikun; Mu Gang; Zhang Hawn; Huang Fuqiang;

  • 作者单位

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram & Superfine Shanghai 200050 Peoples R China|Peking Univ Coll Chem & Mol Engn State Key Lab Rare Earth Mat Chem & Applicat Beijing 100871 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram & Superfine Shanghai 200050 Peoples R China;

    Nanjing Univ Natl Lab Solid State Microstruct Nanjing 210093 Jiangsu Peoples R China|Nanjing Univ Sch Phys Nanjing 210093 Jiangsu Peoples R China|Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China;

    Natl Inst Mat Sci Tsukuba Ibaraki 3050003 Japan;

    Tsinghua Univ Dept Phys State Key Lab Low Dimens Quantum Phys Beijing 100084 Peoples R China|Collaborat Innovat Ctr Quantum Matter Beijing 100084 Peoples R China;

    ShanghaiTech Univ Sch Phys Sci & Technol Shanghai 201210 Peoples R China;

    Chinese Acad Sci Shanghai Inst Microsyst & Informat Technol State Key Lab Funct Mat Informat Shanghai 200050 Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram & Superfine Shanghai 200050 Peoples R China|Peking Univ Coll Chem & Mol Engn State Key Lab Rare Earth Mat Chem & Applicat Beijing 100871 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    2M WS2; superconductivity; topological surface states;

    机译：2M WS2;超导;拓扑表面状态;

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