Dual topology and versatile Rashba-split surface state configurations in 2M-WS2 and 2M-WSe2

Journal article

The 2⁢M-phase transition metal dichalcogenides have recently attracted intensive research interest due to their rich topological and superconducting phase diagrams. Apart from the topological surface states of 2⁢M−W⁢S₂ near Γ that originated from the strong topological order, using angle-resolved photoemission spectroscopy, we discover additional Rashba-split states on the surfaces of both 2⁢M−W⁢S₂ and 2⁢M−WSe₂, which extend in large momentum-energy regions. First-principles calculations well reproduce these states and attribute them to the weak topological orders. The calculations further indicate that the surface state connecting configurations are tunable under moderate pressure, suggesting that 2⁢M−W⁢S₂ and WSe₂ are promising platforms to study topological phase transition and explore topological superconductivity.

Authors: Xu, L; Fang, Y; Huang, F; Zhang, S; Liang, S

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review B
• Volume: 111
• Issue: 11
• Pages: 115151
• Publication date: 2025-03-24
• Acceptance date: 2025-03-11
• DOI: 10.1103/physrevb.111.115151
• EISSN: 2469-9969
• ISSN: 2469-9950
• Language: English