Electrical control of topological 3Q state in intercalated van der Waals antiferromagnet Cox-TaS2

Junghyun Kim; Kai Xuan Zhang; Pyeongjae Park; Woonghee Cho; Hyuncheol Kim; Han Jin Noh; Je Geun Park

doi:10.1038/s41467-025-63991-1

Electrical control of topological 3Q state in intercalated van der Waals antiferromagnet Co_x-TaS₂

Junghyun Kim, Kai Xuan Zhang, Pyeongjae Park, Woonghee Cho, Hyuncheol Kim, Han Jin Noh, Je Geun Park

Correlated Electron Materials

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

Abstract

Van der Waals (vdW) magnets have opened a new avenue of opportunities encompassing various interesting phases. Co_1/3TaS₂–an intercalated metallic vdW antiferromagnet–is one of the latest additions to this growing list of materials due to its unique topologically nontrivial triple-Q (3Q) ground state. This 3Q tetrahedral structure, which critically depends on the Co content, yields the highest-density Skyrmion lattice with scalar spin chirality, resulting in a noticeable anomalous Hall effect. In this work, we demonstrate control of this topological phase via ionic gating. Using four Co_xTaS₂ devices with different Co compositions, we show that ionic gating can cover the entire 3Q topological phase and reveal the nature of the thermodynamically inaccessible phase space. Another striking finding in our data is the existence of an adiabatic discontinuity in the phase boundary between the 3Q and 1Q phases. Our work constitutes one of the first examples of electrical control of scalar spin chirality using an antiferromagnetic metal.

Original language	English
Article number	8943
Journal	Nature Communications
Volume	16
Issue number	1
DOIs	https://doi.org/10.1038/s41467-025-63991-1
State	Published - Dec 2025

Funding

We acknowledge Suhan Son, Hyeonsik Cheong, Beom Hyun Kim, Jaehoon Kim, Young-Woo Son, Moon-Sun Nam, Arzhang Ardavan, and Cristian Batista for their helpful discussions. We also thank Ding Zhang, Ke He, and Qi-Kun Xue for sharing their experimental knowledge and generous help at some stage of this work. We are particularly indebted to Hyeonsik Cheong for the critical manuscript reading and valuable comments. This work was supported by the Samsung Science & Technology Foundation (Grant No. SSTF-BA2101-05). One of the authors (J.-G.P.) is partly funded by the Leading Researcher Programme of the National Research Foundation of Korea (Grant No. RS-2020-NR049405). P.P. acknowledges support by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division.

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title = "Electrical control of topological 3Q state in intercalated van der Waals antiferromagnet Cox-TaS2",

abstract = "Van der Waals (vdW) magnets have opened a new avenue of opportunities encompassing various interesting phases. Co1/3TaS2–an intercalated metallic vdW antiferromagnet–is one of the latest additions to this growing list of materials due to its unique topologically nontrivial triple-Q (3Q) ground state. This 3Q tetrahedral structure, which critically depends on the Co content, yields the highest-density Skyrmion lattice with scalar spin chirality, resulting in a noticeable anomalous Hall effect. In this work, we demonstrate control of this topological phase via ionic gating. Using four CoxTaS2 devices with different Co compositions, we show that ionic gating can cover the entire 3Q topological phase and reveal the nature of the thermodynamically inaccessible phase space. Another striking finding in our data is the existence of an adiabatic discontinuity in the phase boundary between the 3Q and 1Q phases. Our work constitutes one of the first examples of electrical control of scalar spin chirality using an antiferromagnetic metal.",

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AU - Kim, Junghyun

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AU - Kim, Hyuncheol

AU - Noh, Han Jin

AU - Park, Je Geun

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N2 - Van der Waals (vdW) magnets have opened a new avenue of opportunities encompassing various interesting phases. Co1/3TaS2–an intercalated metallic vdW antiferromagnet–is one of the latest additions to this growing list of materials due to its unique topologically nontrivial triple-Q (3Q) ground state. This 3Q tetrahedral structure, which critically depends on the Co content, yields the highest-density Skyrmion lattice with scalar spin chirality, resulting in a noticeable anomalous Hall effect. In this work, we demonstrate control of this topological phase via ionic gating. Using four CoxTaS2 devices with different Co compositions, we show that ionic gating can cover the entire 3Q topological phase and reveal the nature of the thermodynamically inaccessible phase space. Another striking finding in our data is the existence of an adiabatic discontinuity in the phase boundary between the 3Q and 1Q phases. Our work constitutes one of the first examples of electrical control of scalar spin chirality using an antiferromagnetic metal.

AB - Van der Waals (vdW) magnets have opened a new avenue of opportunities encompassing various interesting phases. Co1/3TaS2–an intercalated metallic vdW antiferromagnet–is one of the latest additions to this growing list of materials due to its unique topologically nontrivial triple-Q (3Q) ground state. This 3Q tetrahedral structure, which critically depends on the Co content, yields the highest-density Skyrmion lattice with scalar spin chirality, resulting in a noticeable anomalous Hall effect. In this work, we demonstrate control of this topological phase via ionic gating. Using four CoxTaS2 devices with different Co compositions, we show that ionic gating can cover the entire 3Q topological phase and reveal the nature of the thermodynamically inaccessible phase space. Another striking finding in our data is the existence of an adiabatic discontinuity in the phase boundary between the 3Q and 1Q phases. Our work constitutes one of the first examples of electrical control of scalar spin chirality using an antiferromagnetic metal.

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Electrical control of topological 3Q state in intercalated van der Waals antiferromagnet Co_x-TaS₂

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