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

Maksim Litskevich; Md Shafayat Hossain; Song Bo Zhang; Zi Jia Cheng; Satya N. Guin; Nitesh Kumar; Chandra Shekhar; Zhiwei Wang; Yongkai Li; Guoqing Chang; Jia Xin Yin; Qi Zhang; Guangming Cheng; Tyler A. Cochran; Nana Shumiya; Yu Xiao Jiang; Xian P. Yang; Daniel Multer; Xiaoxiong Liu; Nan Yao; Yugui Yao; Claudia Felser; Titus Neupert; M. Zahid Hasan

doi:10.1038/s41567-024-02469-1

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

Maksim Litskevich, Md Shafayat Hossain, Song Bo Zhang, Zi Jia Cheng, Satya N. Guin, Nitesh Kumar, Chandra Shekhar, Zhiwei Wang, Yongkai Li, Guoqing Chang, Jia Xin Yin, Qi Zhang, Guangming Cheng, Tyler A. Cochran, Nana Shumiya, Yu Xiao Jiang, Xian P. Yang, Daniel Multer, Xiaoxiong Liu, Nan YaoYugui Yao, Claudia Felser, Titus Neupert, M. Zahid Hasan

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Abstract

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.

Original language	English (US)
Pages (from-to)	1253-1261
Number of pages	9
Journal	Nature Physics
Volume	20
Issue number	8
DOIs	https://doi.org/10.1038/s41567-024-02469-1
State	Published - Aug 2024

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1038/s41567-024-02469-1

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Litskevich, M., Hossain, M. S., Zhang, S. B., Cheng, Z. J., Guin, S. N., Kumar, N., Shekhar, C., Wang, Z., Li, Y., Chang, G., Yin, J. X., Zhang, Q., Cheng, G., Cochran, T. A., Shumiya, N., Jiang, Y. X., Yang, X. P., Multer, D., Liu, X., ... Hasan, M. Z. (2024). Boundary modes of a charge density wave state in a topological material. Nature Physics, 20(8), 1253-1261. https://doi.org/10.1038/s41567-024-02469-1

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title = "Boundary modes of a charge density wave state in a topological material",

abstract = "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.",

author = "Maksim Litskevich and Hossain, {Md Shafayat} and Zhang, {Song Bo} and Cheng, {Zi Jia} and Guin, {Satya N.} and Nitesh Kumar and Chandra Shekhar and Zhiwei Wang and Yongkai Li and Guoqing Chang and Yin, {Jia Xin} and Qi Zhang and Guangming Cheng and Cochran, {Tyler A.} and Nana Shumiya and Jiang, {Yu Xiao} and Yang, {Xian P.} and Daniel Multer and Xiaoxiong Liu and Nan Yao and Yugui Yao and Claudia Felser and Titus Neupert and Hasan, {M. Zahid}",

note = "Publisher Copyright: {\textcopyright} The Author(s), under exclusive licence to Springer Nature Limited 2024.",

year = "2024",

month = aug,

doi = "10.1038/s41567-024-02469-1",

language = "English (US)",

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pages = "1253--1261",

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Litskevich, M, Hossain, MS, Zhang, SB, Cheng, ZJ, Guin, SN, Kumar, N, Shekhar, C, Wang, Z, Li, Y, Chang, G, Yin, JX, Zhang, Q, Cheng, G, Cochran, TA, Shumiya, N, Jiang, YX, Yang, XP, Multer, D, Liu, X, Yao, N, Yao, Y, Felser, C, Neupert, T & Hasan, MZ 2024, 'Boundary modes of a charge density wave state in a topological material', Nature Physics, vol. 20, no. 8, pp. 1253-1261. https://doi.org/10.1038/s41567-024-02469-1

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AU - Litskevich, Maksim

AU - Hossain, Md Shafayat

AU - Zhang, Song Bo

AU - Cheng, Zi Jia

AU - Guin, Satya N.

AU - Kumar, Nitesh

AU - Shekhar, Chandra

AU - Wang, Zhiwei

AU - Li, Yongkai

AU - Chang, Guoqing

AU - Yin, Jia Xin

AU - Zhang, Qi

AU - Cheng, Guangming

AU - Cochran, Tyler A.

AU - Shumiya, Nana

AU - Jiang, Yu Xiao

AU - Yang, Xian P.

AU - Multer, Daniel

AU - Liu, Xiaoxiong

AU - Yao, Nan

AU - Yao, Yugui

AU - Felser, Claudia

AU - Neupert, Titus

AU - Hasan, M. Zahid

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N2 - 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.

AB - 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.

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JF - Nature Physics

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

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