2022/10/14 by Zishen Wang, Jingyang You, Wang, Zishen +15
Materials Science · Physics and Astronomy · #2D Materials and Applications #Advanced Chemical Physics Studies #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Superconductivity (cond-mat.supr-con) #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2210.07633
openalex publication_date 2022/10/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Many-body instabilities and topological physics are two attractive topics in condensed matter physics. It is intriguing to explore the interplay between these phenomena in a single quantum material. Here, using the prototypical charge density wave (CDW) material monolayer 1H-NbSe2 as an example, we show how momentum-dependent electron-phonon coupling drives the CDW transition from 3×3 to 2×2 phase under electron doping. More interestingly, we find the coexistence of superconductivity and nontrivial topology in one of the two 2×2 CDW phases, the latter of which is identified by the nonzero Z2 invariant with ideal Dirac cone edge states near the Fermi level. A similar CDW transition-induced topological superconductor has also been confirmed in monolayer 1H-TaSe2. Our findings not only reveal a unique and general method to introduce nontrivial topology by CDW transition, but also provide an ideal platform to modulate different quantum orders by electron doping, thus stimulating experimental interest.