Tunable topological Dirac surface states and van Hove singularities in kagome metal GdV6Sn6

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yong Hu
  • Xianxin Wu
  • Yongqi Yang
  • Shunye Gao
  • Nicholas C. Plumb
  • Andreas P. Schnyder
  • Weiwei Xie
  • Ming Shi

Detail(s)

Original languageEnglish
Article numbereadd2024
Journal / PublicationScience Advances
Volume8
Issue number38
Online published21 Sep 2022
Publication statusPublished - Sep 2022

Link(s)

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.

Research Area(s)

Citation Format(s)

Tunable topological Dirac surface states and van Hove singularities in kagome metal GdV6Sn6. / Hu, Yong; Wu, Xianxin; Yang, Yongqi; Gao, Shunye; Plumb, Nicholas C.; Schnyder, Andreas P.; Xie, Weiwei; Ma, Junzhang; Shi, Ming.

In: Science Advances, Vol. 8, No. 38, eadd2024, 09.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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