Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet

Jia Xin Yin; Songtian S. Zhang; Guoqing Chang; Qi Wang; Stepan S. Tsirkin; Zurab Guguchia; Biao Lian; Huibin Zhou; Kun Jiang; Ilya Belopolski; Nana Shumiya; Daniel Multer; Maksim Litskevich; Tyler A. Cochran; Hsin Lin; Ziqiang Wang; Titus Neupert; Shuang Jia; Hechang Lei; M. Zahid Hasan

doi:10.1038/s41567-019-0426-7

Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet

Jia Xin Yin, Songtian S. Zhang, Guoqing Chang, Qi Wang, Stepan S. Tsirkin, Zurab Guguchia, Biao Lian, Huibin Zhou, Kun Jiang, Ilya Belopolski, Nana Shumiya, Daniel Multer, Maksim Litskevich, Tyler A. Cochran, Hsin Lin, Ziqiang Wang, Titus Neupert, Shuang Jia, Hechang Lei, M. Zahid Hasan

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

241 Scopus citations

Abstract

Electronic systems with flat bands are predicted to be a fertile ground for hosting emergent phenomena including unconventional magnetism and superconductivity ^1–15 , but materials that manifest this feature are rare. Here, we use scanning tunnelling microscopy to elucidate the atomically resolved electronic states and their magnetic response in the kagome magnet Co ₃ Sn ₂ S ₂ (refs. ^16–20 ). We observe a pronounced peak at the Fermi level, which we identify as arising from the kinetically frustrated kagome flat band. On increasing the magnetic field up to ±8 T, this state exhibits an anomalous magnetization-polarized many-body Zeeman shift, dominated by an orbital moment that is opposite to the field direction. Such negative magnetism is induced by spin–orbit-coupling quantum phase effects ^21–25 tied to non-trivial flat band systems. We image the flat band peak, resolve the associated negative magnetism and provide its connection to the Berry curvature field, showing that Co ₃ Sn ₂ S ₂ is a rare example of a kagome magnet where the low-energy physics can be dominated by the spin–orbit-coupled flat band.

Original language	English (US)
Pages (from-to)	443-448
Number of pages	6
Journal	Nature Physics
Volume	15
Issue number	5
DOIs	https://doi.org/10.1038/s41567-019-0426-7
State	Published - May 1 2019

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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Yin, J. X., Zhang, S. S., Chang, G., Wang, Q., Tsirkin, S. S., Guguchia, Z., Lian, B., Zhou, H., Jiang, K., Belopolski, I., Shumiya, N., Multer, D., Litskevich, M., Cochran, T. A., Lin, H., Wang, Z., Neupert, T., Jia, S., Lei, H., & Hasan, M. Z. (2019). Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet. Nature Physics, 15(5), 443-448. https://doi.org/10.1038/s41567-019-0426-7

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title = "Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet",

abstract = " Electronic systems with flat bands are predicted to be a fertile ground for hosting emergent phenomena including unconventional magnetism and superconductivity 1–15 , but materials that manifest this feature are rare. Here, we use scanning tunnelling microscopy to elucidate the atomically resolved electronic states and their magnetic response in the kagome magnet Co 3 Sn 2 S 2 (refs. 16–20 ). We observe a pronounced peak at the Fermi level, which we identify as arising from the kinetically frustrated kagome flat band. On increasing the magnetic field up to ±8 T, this state exhibits an anomalous magnetization-polarized many-body Zeeman shift, dominated by an orbital moment that is opposite to the field direction. Such negative magnetism is induced by spin–orbit-coupling quantum phase effects 21–25 tied to non-trivial flat band systems. We image the flat band peak, resolve the associated negative magnetism and provide its connection to the Berry curvature field, showing that Co 3 Sn 2 S 2 is a rare example of a kagome magnet where the low-energy physics can be dominated by the spin–orbit-coupled flat band.",

author = "Yin, {Jia Xin} and Zhang, {Songtian S.} and Guoqing Chang and Qi Wang and Tsirkin, {Stepan S.} and Zurab Guguchia and Biao Lian and Huibin Zhou and Kun Jiang and Ilya Belopolski and Nana Shumiya and Daniel Multer and Maksim Litskevich and Cochran, {Tyler A.} and Hsin Lin and Ziqiang Wang and Titus Neupert and Shuang Jia and Hechang Lei and Hasan, {M. Zahid}",

note = "Publisher Copyright: {\textcopyright} 2019, The Author(s), under exclusive licence to Springer Nature Limited.",

year = "2019",

month = may,

day = "1",

doi = "10.1038/s41567-019-0426-7",

language = "English (US)",

volume = "15",

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journal = "Nature Physics",

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Yin, JX, Zhang, SS, Chang, G, Wang, Q, Tsirkin, SS, Guguchia, Z, Lian, B, Zhou, H, Jiang, K, Belopolski, I, Shumiya, N, Multer, D, Litskevich, M, Cochran, TA, Lin, H, Wang, Z, Neupert, T, Jia, S, Lei, H & Hasan, MZ 2019, 'Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet', Nature Physics, vol. 15, no. 5, pp. 443-448. https://doi.org/10.1038/s41567-019-0426-7

TY - JOUR

T1 - Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet

AU - Yin, Jia Xin

AU - Zhang, Songtian S.

AU - Chang, Guoqing

AU - Wang, Qi

AU - Tsirkin, Stepan S.

AU - Guguchia, Zurab

AU - Lian, Biao

AU - Zhou, Huibin

AU - Jiang, Kun

AU - Belopolski, Ilya

AU - Shumiya, Nana

AU - Multer, Daniel

AU - Litskevich, Maksim

AU - Cochran, Tyler A.

AU - Lin, Hsin

AU - Wang, Ziqiang

AU - Neupert, Titus

AU - Jia, Shuang

AU - Lei, Hechang

AU - Hasan, M. Zahid

PY - 2019/5/1

Y1 - 2019/5/1

N2 - Electronic systems with flat bands are predicted to be a fertile ground for hosting emergent phenomena including unconventional magnetism and superconductivity 1–15 , but materials that manifest this feature are rare. Here, we use scanning tunnelling microscopy to elucidate the atomically resolved electronic states and their magnetic response in the kagome magnet Co 3 Sn 2 S 2 (refs. 16–20 ). We observe a pronounced peak at the Fermi level, which we identify as arising from the kinetically frustrated kagome flat band. On increasing the magnetic field up to ±8 T, this state exhibits an anomalous magnetization-polarized many-body Zeeman shift, dominated by an orbital moment that is opposite to the field direction. Such negative magnetism is induced by spin–orbit-coupling quantum phase effects 21–25 tied to non-trivial flat band systems. We image the flat band peak, resolve the associated negative magnetism and provide its connection to the Berry curvature field, showing that Co 3 Sn 2 S 2 is a rare example of a kagome magnet where the low-energy physics can be dominated by the spin–orbit-coupled flat band.

AB - Electronic systems with flat bands are predicted to be a fertile ground for hosting emergent phenomena including unconventional magnetism and superconductivity 1–15 , but materials that manifest this feature are rare. Here, we use scanning tunnelling microscopy to elucidate the atomically resolved electronic states and their magnetic response in the kagome magnet Co 3 Sn 2 S 2 (refs. 16–20 ). We observe a pronounced peak at the Fermi level, which we identify as arising from the kinetically frustrated kagome flat band. On increasing the magnetic field up to ±8 T, this state exhibits an anomalous magnetization-polarized many-body Zeeman shift, dominated by an orbital moment that is opposite to the field direction. Such negative magnetism is induced by spin–orbit-coupling quantum phase effects 21–25 tied to non-trivial flat band systems. We image the flat band peak, resolve the associated negative magnetism and provide its connection to the Berry curvature field, showing that Co 3 Sn 2 S 2 is a rare example of a kagome magnet where the low-energy physics can be dominated by the spin–orbit-coupled flat band.

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U2 - 10.1038/s41567-019-0426-7

DO - 10.1038/s41567-019-0426-7

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SN - 1745-2473

VL - 15

SP - 443

EP - 448

JO - Nature Physics

JF - Nature Physics

IS - 5

ER -

Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet

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