Yong Hu^1*, Xianxin Wu^2,3*, Yongqi Yang^4*, Shunye Gao^1,5*, Nicholas C. Plumb^1*, Andreas P. Schnyder^3*, Weiwei Xie^4*, Junzhang Ma^6,7,8*, Ming Shi^1*

1 Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

2 CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

3 Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

4 Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ 08854, USA

5 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

6 Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, China

7 City University of Hong Kong Shenzhen Re- search Institute, Shenzhen, China

8 Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong, China

* Corresponding authors emails: yong.hu@psi.ch, xxwu@itp.ac.cn, yy592@chem.rutgers.edu, shunye.gao@psi.ch, nicholas.plumb@psi.ch, a.schnyder@fkf.mpg.de, weiweixie0317@gmail.com, junzhama@cityu.edu.hk, ming.shi@psi.ch

DOI10.24435/materialscloud:64-3c [version v1]

Publication date: Sep 26, 2022

How to cite this record

Yong Hu, Xianxin Wu, Yongqi Yang, Shunye Gao, Nicholas C. Plumb, Andreas P. Schnyder, Weiwei Xie, Junzhang Ma, Ming Shi, Tunable topological Dirac surface states and van Hove singularities in kagome metal GdV₆Sn₆, Materials Cloud Archive 2022.122 (2022), doi: 10.24435/materialscloud:64-3c.

Description

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 (E_F) 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 E_F, 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.

Materials Cloud sections using this data

Files

File name	Size	Description
GdV6Sn6_soc_GdSn2layerV2.dat MD5md5:4b413b911b9a3fa9b8762d7a453b22b9	2.3 MiB	Surface states decomposed band structure of GdV6Sn6 from DFT calculations, for the Gd termination
GdV6Sn6_soc_VkagomeV2.dat MD5md5:a370bcfcfae2991cb8e17b45683c89b0	2.3 MiB	Surface states decomposed band structure of GdV6Sn6 from DFT calculations, for the kagome termination

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External references

Keywords

Kagome Metal GdV6Sn6 TDSSs and VHSs ARPES+DFT NCCR MARVEL Sino-Swiss Science and Technology Cooperation