论文标题
直接观察拓扑超导体2M-WS2中拓扑表面状态
Direct observation of topological surface state in the topological superconductor 2M-WS2
论文作者
论文摘要
量子自旋霍尔（QSH）效应引起了广泛的研究兴趣，因为旋转三位型和量子计算中的潜在应用，这归因于两个具有相反自旋极化的电导边缘通道以及2E2/h的量化电子电导。最近，2M-WS2是一个新的稳定阶段，具有2m结构的新型稳定阶段，显示了与单层1T'TMDS相同的层结构，被认为是QSH绝缘子，以及与8 K左右的临界过渡温度的超导对导体。超导2M-WS2中拓扑表面状态（TSS）的电子和自旋结构。 TSS表现出特征性的自旋摩肌锁定行为，这表明其中存在长期不足的Z2拓扑状态。我们预计具有共存超导的2M-WS2，TSS可能会拥有有希望的Majorana Bound State。
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 2e2/h. Recently, 2M-WS2, a new stable phase of transition metal dichalcogenides with a 2M structure showing an identical layer configuration to that of the monolayer 1T' TMDs, was suggested to be a QSH insulator as well as a superconductor with critical transition temperature 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-WS2. The TSS exhibits characteristic spin-momentum-locking behavior, suggesting the existence of long-sought nontrivial Z2 topological states therein. We expect that 2M-WS2 with co-existing superconductivity and TSS might host the promising Majorana bound states.
