Boundary modes of a charge density wave state in a topological material

Litskevich, Maksim1; Hossain, Md Shafayat1; Zhang, Song-Bo2,3,4; Cheng, Zi-Jia1; Guin, Satya N.5,6; Kumar, Nitesh5,7; Shekhar, Chandra5; Wang, Zhiwei8,9,10; Li, Yongkai8,9,10; Chang, Guoqing11; Yin, Jia-Xin1; Zhang, Qi1; Cheng, Guangming12; Cochran, Tyler A.1; Shumiya, Nana1; Jiang, Yu-Xiao1; Yang, Xian P.1; Multer, Daniel1; Liu, Xiaoxiong4,13,14,15,16,17; Yao, Nan12; Yao, Yugui8,9; Felser, Claudia5; Neupert, Titus4; Hasan, M. Zahid1,18

2024-06-01

10.1038/s41567-024-02469-1

NATURE PHYSICS   影响因子和分区

1745-2473

1745-2481

["Charge density waves appear in numerous condensed matter platforms ranging from high-temperature superconductors to quantum Hall systems. Despite such ubiquity, there has been a lack of direct experimental study of boundary states that can uniquely stem from the charge order. Here we directly visualize the bulk and boundary phenomenology of the charge density wave in a topological material, Ta2Se8I, using scanning tunnelling microscopy. At a monolayer step edge, we demonstrate the presence of an in-gap boundary mode persisting up to the charge ordering temperature with modulations along the edge that match the charge density wave wavevector along the edge. Furthermore, these results manifesting the presence of an edge state challenge the existing axion insulator interpretation of the charge-ordered phase in this compound.","Topological boundary modes within charge-ordered states have not yet been observed experimentally. Now an in-gap boundary mode, stemming solely from the charge order, is visualized in the topological material Ta2Se8I."]

SCI ; EI

英语

其他

Gordon and Betty Moore Foundation[GBMF9461] ; US DOE[DOE/BES DE-FG-02-05ER46200] ; European Union[ERC-StG-Neupert-757867-PARATOP] ; Swiss National Science Foundation[TMCG-2_213805] ; National Research Foundation, Singapore[NRF-NRFF13-2021-0010] ; Agency for Science, Technology and Research (A*STAR) under its Manufacturing, Trade and Connectivity (MTC) Individual Research Grant (IRG)[M23M6c0100] ; National Science Foundation of China (NSFC)["92065109","12321004","12234003"] ; National Key R&D Program of China["2020YFA0308800","2022YFA1403400"] ; Beijing Natural Science Foundation[Z210006] ; Innovation Program for Quantum Science and Technology[2021ZD0302800] ; Anhui Initiative in Quantum Information Technologies[AHY170000] ; European Research Council (ERC)[742068] ; Deutsche Forschungsgemeinschaft (DFG)["SFB 1143","247310070"] ; Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - ct.qmat["EXC 2147","39085490"] ; null[DMR-2011750] ; null[2022YFA1403700]

Physics

Physics, Multidisciplinary

WOS:001243252100001

NATURE PORTFOLIO

Web of Science

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18.ORNL, Quantum Sci Ctr QSC, Oak Ridge, TN 37830 USA

Litskevich, Maksim,Hossain, Md Shafayat,Zhang, Song-Bo,et al. Boundary modes of a charge density wave state in a topological material[J]. NATURE PHYSICS,2024.

Litskevich, Maksim.,Hossain, Md Shafayat.,Zhang, Song-Bo.,Cheng, Zi-Jia.,Guin, Satya N..,...&Hasan, M. Zahid.(2024).Boundary modes of a charge density wave state in a topological material.NATURE PHYSICS.

Litskevich, Maksim,et al."Boundary modes of a charge density wave state in a topological material".NATURE PHYSICS (2024).