2018/08/31 by Yuqiang Fang, Jie Pan, Dongqin Zhang +15
Materials Science · Physics and Astronomy · #2D Materials and Applications #Anisotropy #Band gap #Condensed matter physics #Graphene research and applications #Materials science #Metastability #Monoclinic crystal system #Physics #Quantum #Quantum mechanics #Semimetal #Superconductivity #Surface (topology) #Surface states #Topological Materials and Phenomena #Topological insulator #Topological order #Topology (electrical circuits) #cond-mat.supr-con
paper · pdf · doi:10.1002/adma.201901942
published as Adv.Mater.2019, 1901942 · 20 pages, 5 figures, 1 table
arxiv created 2018/11/21 · openalex publication_date 2019/06/03 · arxiv updated 2019/06/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Abstract 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 WS 2 dubbed “2M” WS 2 , is constructed from 1T′ WS 2 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 WS 2 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 WS 2 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 WS 2 might be an interesting topological superconductor candidate from the VIB‐group transition metal dichalcogenides.