Cho Soohyun, Huh Soonsang, Fang Yuqiang, Hua Chenqiang, Bai Hua, Jiang Zhicheng, Liu Zhengtai, Liu Jishan, Chen Zhenhua, Fukushima Yuto, Harasawa Ayumi, Kawaguchi Kaishu, Shin Shik, Kondo Takeshi, Lu Yunhao, Mu Gang, Huang Fuqiang, Shen Dawei
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai200050, People's Republic of China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing100049, People's Republic of China.
Nano Lett. 2022 Nov 23;22(22):8827-8834. doi: 10.1021/acs.nanolett.2c02372. Epub 2022 Nov 11.
The quantum spin Hall (QSH) effect has attracted extensive research interest because of the potential applications in spintronics and quantum computing, which is attributable to two conducting edge channels with opposite spin polarization and the quantized electronic conductance of 2/. Recently, 2M-WS, a new stable phase of transition metal dichalcogenides with a 2M structure showing a layer configuration identical to that of the monolayer 1T' TMDs, was suggested to be a QSH insulator as well as a superconductor with a critical transition temperature of around 8 K. Here, high-resolution angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES are applied to investigate the electronic and spin structure of the topological surface states (TSS) in the superconducting 2M-WS. The TSS exhibit characteristic spin-momentum-locking behavior, suggesting the existence of long-sought nontrivial topological states therein. We expect that 2M-WS with coexisting superconductivity and TSS might host the promising Majorana bound states.
量子自旋霍尔（QSH）效应因其在自旋电子学和量子计算中的潜在应用而引起了广泛的研究兴趣，这归因于两个具有相反自旋极化的导电边缘通道以及2/e的量子化电子电导。最近，2M-WS，一种具有2M结构的新型稳定过渡金属二硫属化物相，其层结构与单层1T' TMDs相同，被认为是一种QSH绝缘体以及一种临界转变温度约为8K的超导体。在此，应用高分辨率角分辨光电子能谱（ARPES）和自旋分辨ARPES来研究超导2M-WS中拓扑表面态（TSS）的电子和自旋结构。TSS表现出特征性的自旋动量锁定行为，表明其中存在长期寻求的非平凡拓扑态。我们预计，同时具有超导性和TSS的2M-WS可能存在有前景的马约拉纳束缚态。
