Tunable topological Dirac surface states and van Hove singularities in kagome metal GdV6Sn6
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Original language | English |
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Article number | eadd2024 |
Journal / Publication | Science Advances |
Volume | 8 |
Issue number | 38 |
Online published | 21 Sept 2022 |
Publication status | Published - Sept 2022 |
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DOI | DOI |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85138285674&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(6297b4ff-6e3b-472d-8bf3-0e9babe96889).html |
Abstract
Transition-metal-based kagome materials at van Hove filling are a rich frontier for the investigation of novel topological electronic states and correlated phenomena. To date, in the idealized two-dimensional kagome lattice, topologically Dirac surface states (TDSSs) have not been unambiguously observed, and the manipulation of TDSSs and van Hove singularities (VHSs) remains largely unexplored. Here, we reveal TDSSs originating from a ℤ2 bulk topology and identify multiple VHSs near the Fermi level (EF) in magnetic kagome material GdV6Sn6. Using in situ surface potassium deposition, we successfully realize manipulation of the TDSSs and VHSs. The Dirac point of the TDSSs can be tuned from above to below EF, which reverses the chirality of the spin texture at the Fermi surface. These results establish GdV6Sn6 as a fascinating platform for studying the nontrivial topology, magnetism, and correlation effects native to kagome lattices. They also suggest potential application of spintronic devices based on kagome materials.
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Citation Format(s)
Tunable topological Dirac surface states and van Hove singularities in kagome metal GdV6Sn6. / Hu, Yong; Wu, Xianxin; Yang, Yongqi et al.
In: Science Advances, Vol. 8, No. 38, eadd2024, 09.2022.
In: Science Advances, Vol. 8, No. 38, eadd2024, 09.2022.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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