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Bibliographic Details
Main Authors:	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.
Format:	Preprint
Published:	2025
Subjects:	Materials Science Strongly Correlated Electrons
Online Access:	https://arxiv.org/abs/2509.09903
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Table of 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.

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