Impact of Tiny Fermi Pockets with Extremely High Mobility on the Hall Anomaly in the Kagome Metal CsV3Sb5

S. Liu; M. Roppongi; M. Kimata; K. Ishihara; R. Grasset; M. Konczykowski; B. R. Ortiz; S. D. Wilson; K. Yoshimi; T. Shibauchi; K. Hashimoto

doi:10.1103/d4dw-2v6k

Impact of Tiny Fermi Pockets with Extremely High Mobility on the Hall Anomaly in the Kagome Metal CsV3Sb5

S. Liu
, M. Roppongi
, M. Kimata
, K. Ishihara
, R. Grasset
, M. Konczykowski
, B. R. Ortiz
, S. D. Wilson
, K. Yoshimi
, T. Shibauchi
, K. Hashimoto

Correlated Electron Materials

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

4 Scopus citations

Abstract

The kagome metal CsV3Sb5 exhibits an unusual charge-density-wave (CDW) order, where the emergence of loop current order that breaks time-reversal symmetry (TRS) has been proposed. A key feature of this CDW phase is a nonmonotonic Hall effect at low fields, often attributed to TRS breaking. However, its origin remains unclear. Here, we conduct comprehensive magnetotransport measurements on CsV3Sb5 and, through mobility spectrum analysis, identify the formation of tiny Fermi pockets with extremely high mobility below the CDW transition. Furthermore, electron irradiation experiments reveal that the nonmonotonic Hall effect is significantly suppressed in samples with reduced mobility, despite no substantial change in the electronic structure. These results indicate that the nonmonotonic Hall effect originates from these tiny Fermi pockets with high mobility carriers rather than anomalous Hall mechanisms, providing new insights into understanding the Hall anomaly in this kagome system.

Original language	English
Article number	056502
Journal	Physical Review Letters
Volume	135
Issue number	5
DOIs	https://doi.org/10.1103/d4dw-2v6k
State	Published - Aug 1 2025

Funding

We thank H. Kontani for fruitful discussions. This work was supported by Grants-in-Aid for Scientific Research (KAKENHI) (No. JP25H00838, No. JP24K17007, No. JP24H01646, No. JP23H00089, No. JP22H00105, No. JP22H01176, No. JP22H04933, and No. JP22H00109), Grant-in-Aid for Scientific Research on innovative areas “Quantum Liquid Crystals” (No. JP19H05824), Grant-in-Aid for Scientific Research for Transformative Research Areas (A) “Condensed Conjugation” (No. JP20H05869 and No. JP21H05470), Grant-in-Aid for Scientific Research for Transformative Research Areas (A) “Correlation Design Science” (No. JP25H012468) from the Japan Society for the Promotion of Science (JSPS), and JST, PRESTO (No. JPMJPR2458), Japan. This work was performed under the GIMRT Program of the Institute for Materials Research, Tohoku University (Proposals No. 202012-HMKPA-0057, No. 202112-HMKPA-0018, and No. 202212-HMKPA-0055). Electron irradiation experiments performed at the SIRIUS beamline were supported by the EMIR&A French network (FR CNRS 3618). Work by B. R. O. is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. S. D. W. gratefully acknowledge support via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under Award No. DMR-1906325. We thank H. Kontani for fruitful discussions. This work was supported by Grants-in-Aid for Scientific Research (KAKENHI) (No. JP25H00838, No. JP24K17007, No. JP24H01646, No. JP23H00089, No. JP22H00105, No. JP22H01176, No. JP22H04933, and No. JP22H00109), Grant-in-Aid for Scientific Research on innovative areas “Quantum Liquid Crystals” (No. JP19H05824), Grant-in-Aid for Scientific Research for Transformative Research Areas (A) “Condensed Conjugation” (No. JP20H05869 and No. JP21H05470), Grant-in-Aid for Scientific Research for Transformative Research Areas (A) “Correlation Design Science” (No. JP25H012468) from the Japan Society for the Promotion of Science (JSPS), and JST, PRESTO (No. JPMJPR2458), Japan. This work was performed under the GIMRT Program of the Institute for Materials Research, Tohoku University (Proposals No. 202012-HMKPA-0057, No. 202112-HMKPA-0018, and No. 202212-HMKPA-0055). Electron irradiation experiments performed at the SIRIUS beamline were supported by the EMIR&A French network (FR CNRS 3618). Work by B. R. O. is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. S. D. W. gratefully acknowledge support via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under Award No. DMR-1906325.

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title = "Impact of Tiny Fermi Pockets with Extremely High Mobility on the Hall Anomaly in the Kagome Metal CsV3Sb5",

abstract = "The kagome metal CsV3Sb5 exhibits an unusual charge-density-wave (CDW) order, where the emergence of loop current order that breaks time-reversal symmetry (TRS) has been proposed. A key feature of this CDW phase is a nonmonotonic Hall effect at low fields, often attributed to TRS breaking. However, its origin remains unclear. Here, we conduct comprehensive magnetotransport measurements on CsV3Sb5 and, through mobility spectrum analysis, identify the formation of tiny Fermi pockets with extremely high mobility below the CDW transition. Furthermore, electron irradiation experiments reveal that the nonmonotonic Hall effect is significantly suppressed in samples with reduced mobility, despite no substantial change in the electronic structure. These results indicate that the nonmonotonic Hall effect originates from these tiny Fermi pockets with high mobility carriers rather than anomalous Hall mechanisms, providing new insights into understanding the Hall anomaly in this kagome system.",

author = "S. Liu and M. Roppongi and M. Kimata and K. Ishihara and R. Grasset and M. Konczykowski and Ortiz, \{B. R.\} and Wilson, \{S. D.\} and K. Yoshimi and T. Shibauchi and K. Hashimoto",

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AU - Liu, S.

AU - Roppongi, M.

AU - Kimata, M.

AU - Ishihara, K.

AU - Grasset, R.

AU - Konczykowski, M.

AU - Ortiz, B. R.

AU - Wilson, S. D.

AU - Yoshimi, K.

AU - Shibauchi, T.

AU - Hashimoto, K.

PY - 2025/8/1

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N2 - The kagome metal CsV3Sb5 exhibits an unusual charge-density-wave (CDW) order, where the emergence of loop current order that breaks time-reversal symmetry (TRS) has been proposed. A key feature of this CDW phase is a nonmonotonic Hall effect at low fields, often attributed to TRS breaking. However, its origin remains unclear. Here, we conduct comprehensive magnetotransport measurements on CsV3Sb5 and, through mobility spectrum analysis, identify the formation of tiny Fermi pockets with extremely high mobility below the CDW transition. Furthermore, electron irradiation experiments reveal that the nonmonotonic Hall effect is significantly suppressed in samples with reduced mobility, despite no substantial change in the electronic structure. These results indicate that the nonmonotonic Hall effect originates from these tiny Fermi pockets with high mobility carriers rather than anomalous Hall mechanisms, providing new insights into understanding the Hall anomaly in this kagome system.

AB - The kagome metal CsV3Sb5 exhibits an unusual charge-density-wave (CDW) order, where the emergence of loop current order that breaks time-reversal symmetry (TRS) has been proposed. A key feature of this CDW phase is a nonmonotonic Hall effect at low fields, often attributed to TRS breaking. However, its origin remains unclear. Here, we conduct comprehensive magnetotransport measurements on CsV3Sb5 and, through mobility spectrum analysis, identify the formation of tiny Fermi pockets with extremely high mobility below the CDW transition. Furthermore, electron irradiation experiments reveal that the nonmonotonic Hall effect is significantly suppressed in samples with reduced mobility, despite no substantial change in the electronic structure. These results indicate that the nonmonotonic Hall effect originates from these tiny Fermi pockets with high mobility carriers rather than anomalous Hall mechanisms, providing new insights into understanding the Hall anomaly in this kagome system.

UR - https://www.scopus.com/pages/publications/105013688219

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JO - Physical Review Letters

JF - Physical Review Letters

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Impact of Tiny Fermi Pockets with Extremely High Mobility on the Hall Anomaly in the Kagome Metal CsV3Sb5

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