Topological surface states and flat bands in the kagome superconductor CsV3Sb5

Yong Hu; Samuel M.L. Teicher; Brenden R. Ortiz; Yang Luo; Shuting Peng; Linwei Huai; Junzhang Ma; Nicholas C. Plumb; Stephen D. Wilson; Junfeng He; Ming Shi

doi:10.1016/j.scib.2021.11.026

Topological surface states and flat bands in the kagome superconductor CsV₃Sb₅

Yong Hu, Samuel M.L. Teicher, Brenden R. Ortiz, Yang Luo, Shuting Peng, Linwei Huai, Junzhang Ma, Nicholas C. Plumb, Stephen D. Wilson, Junfeng He, Ming Shi

Research output: Contribution to journal › Article › peer-review

79 Scopus citations

Abstract

Exotic quantum phenomena may appear in material systems with multiple orders or phases, where the mutual interactions can give rise to new physics beyond that of each component. Here, we report spectroscopic evidence for a unique combination of topology and correlation effects in the kagome superconductor CsV₃Sb₅. Topologically nontrivial surface states are observed near the Fermi energy (E_F), indicating that the topological physics may be active upon entering the superconducting state. Flat bands are observed, suggesting that electron correlation effects are also at play in this system. Our results reveal the peculiar electronic structure of CsV₃Sb₅, which holds the potential for realizing Majorana zero modes and anomalous superconducting states in kagome lattices. They also establish CsV₃Sb₅ as a unique platform for exploring the interactions between the charge order, topology, correlation effects and superconductivity.

Original language	English
Pages (from-to)	495-500
Number of pages	6
Journal	Science Bulletin
Volume	67
Issue number	5
DOIs	https://doi.org/10.1016/j.scib.2021.11.026
State	Published - Mar 15 2022
Externally published	Yes

Funding

The work at University of Science and Technology of China (USTC) was supported by the Fundamental Research Funds for the Central Universities (WK3510000012 and WK3510000008), USTC Start-up Fund and National Natural Science Foundation of China (12004363). The work at PSI was supported by the Swiss National Science Foundation (200021-188413), the Sino-Swiss Science and Technology Cooperation (IZLCZ2-170075). The work at UC Santa Barbara was supported via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i Program under award DMR-1906325. This research made use of the shared facilities of the NSF Materials Research Science and Engineering Center at UC Santa Barbara (DMR-1720256). The UC Santa Barbara MRSEC is a member of the Materials Research Facilities Network (www.mrfn.org). S. M. L. T. acknowledged use of the shared computing facilities of the Center for Scientific Computing at UC Santa Barbara, supported by NSF CNS-1725797 and NSF DMR-1720256. B. R. O. acknowledged support from the California NanoSystems Institute through the Elings Fellowship program. S. M. L. T. has been supported by the National Science Foundation Graduate Research Fellowship Program (DGE-1650114). The work at University of Science and Technology of China (USTC) was supported by the Fundamental Research Funds for the Central Universities (WK3510000012 and WK3510000008), USTC Start-up Fund and National Natural Science Foundation of China (12004363). The work at PSI was supported by the Swiss National Science Foundation (200021-188413), and the Sino-Swiss Science and Technology Cooperation (IZLCZ2-170075). The work at UC Santa Barbara was supported via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i Program under award DMR-1906325. This research made use of the shared facilities of the NSF Materials Research Science and Engineering Center at UC Santa Barbara (DMR-1720256). The UC Santa Barbara MRSEC is a member of the Materials Research Facilities Network (www.mrfn.org). S. M. L. T. acknowledged use of the shared computing facilities of the Center for Scientific Computing at UC Santa Barbara, supported by NSF CNS-1725797 and NSF DMR-1720256. B. R. O. acknowledged support from the California NanoSystems Institute through the Elings Fellowship program. S. M. L. T. is supported by the National Science Foundation Graduate Research Fellowship Program (DGE-1650114). Junfeng He and Yong Hu designed the research. Brenden R. Ortiz grew and characterized the crystals with guidance from Stephen D. Wilson. Samuel M. L. Teicher performed the theoretical calculations. Yong Hu performed the ARPES experiments with help from Nicholas C. Plumb, Junzhang Ma, and Ming Shi. Yong Hu analyzed the data. Yong Hu drew the figures with guidance from Junfeng He and Ming Shi. Junfeng He and Yong Hu wrote the paper with inputs from Samuel M. L. Teicher, Brenden R. Ortiz, Stephen D. Wilson and Ming Shi. All authors contributed to the discussion. Stephen D. Wilson, Junfeng He and Ming Shi supervised the project.

Funders	Funder number
California NanoSystems Institute
Center for Scientific Computing at UC Santa Barbara
NSF Materials Research Science and Engineering Center at UC Santa Barbara
Sino-Swiss Science and Technology Cooperation	IZLCZ2-170075
UC Santa Barbara MRSEC
UC Santa Barbara NSF	DMR-1906325
National Science Foundation	DMR-1720256, CNS-1725797, DGE-1650114
University of California, Santa Barbara
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	200021-188413
National Natural Science Foundation of China	12004363
University of Science and Technology of China
Fundamental Research Funds for the Central Universities	WK3510000012, WK3510000008

Keywords

ARPES
Charge density wave order
Kagome superconductors
Topologically nontrivial surface states

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.scib.2021.11.026

Cite this

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title = "Topological surface states and flat bands in the kagome superconductor CsV3Sb5",

abstract = "Exotic quantum phenomena may appear in material systems with multiple orders or phases, where the mutual interactions can give rise to new physics beyond that of each component. Here, we report spectroscopic evidence for a unique combination of topology and correlation effects in the kagome superconductor CsV3Sb5. Topologically nontrivial surface states are observed near the Fermi energy (EF), indicating that the topological physics may be active upon entering the superconducting state. Flat bands are observed, suggesting that electron correlation effects are also at play in this system. Our results reveal the peculiar electronic structure of CsV3Sb5, which holds the potential for realizing Majorana zero modes and anomalous superconducting states in kagome lattices. They also establish CsV3Sb5 as a unique platform for exploring the interactions between the charge order, topology, correlation effects and superconductivity.",

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AU - Hu, Yong

AU - Teicher, Samuel M.L.

AU - Ortiz, Brenden R.

AU - Luo, Yang

AU - Peng, Shuting

AU - Huai, Linwei

AU - Ma, Junzhang

AU - Plumb, Nicholas C.

AU - Wilson, Stephen D.

AU - He, Junfeng

AU - Shi, Ming

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AB - Exotic quantum phenomena may appear in material systems with multiple orders or phases, where the mutual interactions can give rise to new physics beyond that of each component. Here, we report spectroscopic evidence for a unique combination of topology and correlation effects in the kagome superconductor CsV3Sb5. Topologically nontrivial surface states are observed near the Fermi energy (EF), indicating that the topological physics may be active upon entering the superconducting state. Flat bands are observed, suggesting that electron correlation effects are also at play in this system. Our results reveal the peculiar electronic structure of CsV3Sb5, which holds the potential for realizing Majorana zero modes and anomalous superconducting states in kagome lattices. They also establish CsV3Sb5 as a unique platform for exploring the interactions between the charge order, topology, correlation effects and superconductivity.

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