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Topological Fermi-arc surface state covered by floating electrons on a two-dimensional electride
- Source :
- Nat. Commun. 15 (2024) 5615
- Publication Year :
- 2024
-
Abstract
- Two-dimensional electrides can acquire topologically non-trivial phases due to intriguing interplay between the cationic atomic layers and anionic electron layers. However, experimental evidence of topological surface states has yet to be verified. Here, via angle-resolved photoemission spectroscopy (ARPES) and scanning tunnelling microscopy (STM), we probe the magnetic Weyl states of the ferromagnetic electride $[Gd_{2}$C]^{2+}\cdot2e^{-}$. In particular, the presence of Weyl cones and Fermi-arc states is demonstrated through photon energy-dependent ARPES measurements, agreeing with theoretical band structure calculations. Notably, the STM measurements reveal that the Fermi-arc states exist underneath a floating quantum electron liquid on the top Gd layer, forming double-stacked surface states in a heterostructure. Our work thus not only unveils the non-trivial topology of the $[Gd_{2}$C]^{2+}\cdot2e^{-}$ electride but also realizes a surface heterostructure that can host phenomena distinct from the bulk.<br />Comment: 22 pages, 6 figures
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Nat. Commun. 15 (2024) 5615
- Publication Type :
- Report
- Accession number :
- edsarx.2407.09153
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1038/s41467-024-49841-6