Evolution from Topological Dirac Metal to Flat-band-Induced Antiferromagnet in Layered KxNi4S2 (0<=x<=1)
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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909783505764352 |
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| author | Zhao, Hengdi Zhou, Xiuquan Park, Hyowon Deng, Tianqi Wilfong, Brandon Au II, Alann P. Pate, Samuel E. Brown, Craig M. Wu, Hui Bhowmick, Tushar McNamee, Tessa Kumar, Ravhi Chen, Yu-Sheng Xiao, Zhi-Li Hemley, Russell Cai, Weizhao Deemyad, Shanti Chung, Duck-Young Rosenkranz, Stephan Kanatzidis, Mercouri G. |
| author_facet | Zhao, Hengdi Zhou, Xiuquan Park, Hyowon Deng, Tianqi Wilfong, Brandon Au II, Alann P. Pate, Samuel E. Brown, Craig M. Wu, Hui Bhowmick, Tushar McNamee, Tessa Kumar, Ravhi Chen, Yu-Sheng Xiao, Zhi-Li Hemley, Russell Cai, Weizhao Deemyad, Shanti Chung, Duck-Young Rosenkranz, Stephan Kanatzidis, Mercouri G. |
| contents | Condensed matter systems with coexisting Dirac cones and flat bands, and a switchable control between them within a single system, are desirable but remarkably uncommon. Here we report a layered quantum material system, KxNi4S2 (0 <= x <= 1), that simultaneously hosts both characteristics without involving typical Kagome/honeycomb lattices. Enabled by a topochemical K-deintercalation process, the Fermi surface can be fine-tuned continuously over a wide range of energies. Consequently, a non-magnetic Dirac-metal state with a topological nontrivial Z2 index of 1;(000), supported by first-principles calculations and high mobility up to 1471 cm2V-1s-1, is observed on the K-rich x = 1 side, whereas a flat-band induced antiferromagnetic state with TN up to 10.1 K emerges as K-content approaches 0. The KxNi4S2 system offers a versatile platform for exploring emerging phenomena and underscores a viable pathway for in-situ control of quantum materials dominated by Dirac cones, flat bands, and their interplay. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_09903 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evolution from Topological Dirac Metal to Flat-band-Induced Antiferromagnet in Layered KxNi4S2 (0<=x<=1) Zhao, Hengdi Zhou, Xiuquan Park, Hyowon Deng, Tianqi Wilfong, Brandon Au II, Alann P. Pate, Samuel E. Brown, Craig M. Wu, Hui Bhowmick, Tushar McNamee, Tessa Kumar, Ravhi Chen, Yu-Sheng Xiao, Zhi-Li Hemley, Russell Cai, Weizhao Deemyad, Shanti Chung, Duck-Young Rosenkranz, Stephan Kanatzidis, Mercouri G. Materials Science Strongly Correlated Electrons Condensed matter systems with coexisting Dirac cones and flat bands, and a switchable control between them within a single system, are desirable but remarkably uncommon. Here we report a layered quantum material system, KxNi4S2 (0 <= x <= 1), that simultaneously hosts both characteristics without involving typical Kagome/honeycomb lattices. Enabled by a topochemical K-deintercalation process, the Fermi surface can be fine-tuned continuously over a wide range of energies. Consequently, a non-magnetic Dirac-metal state with a topological nontrivial Z2 index of 1;(000), supported by first-principles calculations and high mobility up to 1471 cm2V-1s-1, is observed on the K-rich x = 1 side, whereas a flat-band induced antiferromagnetic state with TN up to 10.1 K emerges as K-content approaches 0. The KxNi4S2 system offers a versatile platform for exploring emerging phenomena and underscores a viable pathway for in-situ control of quantum materials dominated by Dirac cones, flat bands, and their interplay. |
| title | Evolution from Topological Dirac Metal to Flat-band-Induced Antiferromagnet in Layered KxNi4S2 (0<=x<=1) |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.09903 |