Softening of a flat phonon mode in the kagome ScV6Sn6

A. Korshunov; H. Hu; D. Subires; Y. Jiang; D. Călugăru; X. Feng; A. Rajapitamahuni; C. Yi; S. Roychowdhury; M. G. Vergniory; J. Strempfer; C. Shekhar; E. Vescovo; D. Chernyshov; A. H. Said; A. Bosak; C. Felser; B. Andrei Bernevig; S. Blanco-Canosa

doi:10.1038/s41467-023-42186-6

Softening of a flat phonon mode in the kagome ScV₆Sn₆

A. Korshunov, H. Hu, D. Subires, Y. Jiang, D. Călugăru, X. Feng, A. Rajapitamahuni, C. Yi, S. Roychowdhury, M. G. Vergniory, J. Strempfer, C. Shekhar, E. Vescovo, D. Chernyshov, A. H. Said, A. Bosak, C. Felser, B. Andrei Bernevig, S. Blanco-Canosa

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30 Scopus citations

Abstract

Geometrically frustrated kagome lattices are raising as novel platforms to engineer correlated topological electron flat bands that are prominent to electronic instabilities. Here, we demonstrate a phonon softening at the k_z = π plane in ScV₆Sn₆. The low energy longitudinal phonon collapses at ~98 K and q = 131312 due to the electron-phonon interaction, without the emergence of long-range charge order which sets in at a different propagation vector q _CDW = 131313 . Theoretical calculations corroborate the experimental finding to indicate that the leading instability is located at 131312 of a rather flat mode. We relate the phonon renormalization to the orbital-resolved susceptibility of the trigonal Sn atoms and explain the approximately flat phonon dispersion. Our data report the first example of the collapse of a kagome bosonic mode and promote the 166 compounds of kagomes as primary candidates to explore correlated flat phonon-topological flat electron physics.

Original language	English (US)
Article number	6646
Journal	Nature communications
Volume	14
Issue number	1
DOIs	https://doi.org/10.1038/s41467-023-42186-6
State	Published - Dec 2023

All Science Journal Classification (ASJC) codes

General Chemistry
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy

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Korshunov, A., Hu, H., Subires, D., Jiang, Y., Călugăru, D., Feng, X., Rajapitamahuni, A., Yi, C., Roychowdhury, S., Vergniory, M. G., Strempfer, J., Shekhar, C., Vescovo, E., Chernyshov, D., Said, A. H., Bosak, A., Felser, C., Bernevig, B. A., & Blanco-Canosa, S. (2023). Softening of a flat phonon mode in the kagome ScV₆Sn₆. Nature communications, 14(1), Article 6646. https://doi.org/10.1038/s41467-023-42186-6

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title = "Softening of a flat phonon mode in the kagome ScV6Sn6",

abstract = "Geometrically frustrated kagome lattices are raising as novel platforms to engineer correlated topological electron flat bands that are prominent to electronic instabilities. Here, we demonstrate a phonon softening at the kz = π plane in ScV6Sn6. The low energy longitudinal phonon collapses at ~98 K and q = 131312 due to the electron-phonon interaction, without the emergence of long-range charge order which sets in at a different propagation vector q CDW = 131313 . Theoretical calculations corroborate the experimental finding to indicate that the leading instability is located at 131312 of a rather flat mode. We relate the phonon renormalization to the orbital-resolved susceptibility of the trigonal Sn atoms and explain the approximately flat phonon dispersion. Our data report the first example of the collapse of a kagome bosonic mode and promote the 166 compounds of kagomes as primary candidates to explore correlated flat phonon-topological flat electron physics.",

author = "A. Korshunov and H. Hu and D. Subires and Y. Jiang and D. C{\u a}lug{\u a}ru and X. Feng and A. Rajapitamahuni and C. Yi and S. Roychowdhury and Vergniory, {M. G.} and J. Strempfer and C. Shekhar and E. Vescovo and D. Chernyshov and Said, {A. H.} and A. Bosak and C. Felser and Bernevig, {B. Andrei} and S. Blanco-Canosa",

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doi = "10.1038/s41467-023-42186-6",

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Korshunov, A, Hu, H, Subires, D, Jiang, Y, Călugăru, D, Feng, X, Rajapitamahuni, A, Yi, C, Roychowdhury, S, Vergniory, MG, Strempfer, J, Shekhar, C, Vescovo, E, Chernyshov, D, Said, AH, Bosak, A, Felser, C, Bernevig, BA & Blanco-Canosa, S 2023, 'Softening of a flat phonon mode in the kagome ScV₆Sn₆', Nature communications, vol. 14, no. 1, 6646. https://doi.org/10.1038/s41467-023-42186-6

TY - JOUR

T1 - Softening of a flat phonon mode in the kagome ScV6Sn6

AU - Korshunov, A.

AU - Hu, H.

AU - Subires, D.

AU - Jiang, Y.

AU - Călugăru, D.

AU - Feng, X.

AU - Rajapitamahuni, A.

AU - Yi, C.

AU - Roychowdhury, S.

AU - Vergniory, M. G.

AU - Strempfer, J.

AU - Shekhar, C.

AU - Vescovo, E.

AU - Chernyshov, D.

AU - Said, A. H.

AU - Bosak, A.

AU - Felser, C.

AU - Bernevig, B. Andrei

AU - Blanco-Canosa, S.

PY - 2023/12

Y1 - 2023/12

N2 - Geometrically frustrated kagome lattices are raising as novel platforms to engineer correlated topological electron flat bands that are prominent to electronic instabilities. Here, we demonstrate a phonon softening at the kz = π plane in ScV6Sn6. The low energy longitudinal phonon collapses at ~98 K and q = 131312 due to the electron-phonon interaction, without the emergence of long-range charge order which sets in at a different propagation vector q CDW = 131313 . Theoretical calculations corroborate the experimental finding to indicate that the leading instability is located at 131312 of a rather flat mode. We relate the phonon renormalization to the orbital-resolved susceptibility of the trigonal Sn atoms and explain the approximately flat phonon dispersion. Our data report the first example of the collapse of a kagome bosonic mode and promote the 166 compounds of kagomes as primary candidates to explore correlated flat phonon-topological flat electron physics.

AB - Geometrically frustrated kagome lattices are raising as novel platforms to engineer correlated topological electron flat bands that are prominent to electronic instabilities. Here, we demonstrate a phonon softening at the kz = π plane in ScV6Sn6. The low energy longitudinal phonon collapses at ~98 K and q = 131312 due to the electron-phonon interaction, without the emergence of long-range charge order which sets in at a different propagation vector q CDW = 131313 . Theoretical calculations corroborate the experimental finding to indicate that the leading instability is located at 131312 of a rather flat mode. We relate the phonon renormalization to the orbital-resolved susceptibility of the trigonal Sn atoms and explain the approximately flat phonon dispersion. Our data report the first example of the collapse of a kagome bosonic mode and promote the 166 compounds of kagomes as primary candidates to explore correlated flat phonon-topological flat electron physics.

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JO - Nature communications

JF - Nature communications

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Softening of a flat phonon mode in the kagome ScV₆Sn₆

Abstract

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