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Jiang, Yu-Xiao; Yin, Jia-Xin; Denner, M. Michael; Shumiya, Nana; Ortiz, Brenden R.; Xu, Gang; Guguchia, Zurab; He, Junyi; Hossain, Md Shafayat; Liu, Xiaoxiong; Ruff, Jacob; Kautzsch, Linus; Zhang, Songtian S.; Chang, Guoqing; Belopolski, Ilya; Zhang, Qi; Cochran, Tyler A.; Multer, Daniel; Litskevich, Maksim; Cheng, Zi-Jia; Yang, Xian P.; Wang, Ziqiang; Thomale, Ronny; Neupert, Titus; Wilson, Stephen D.; Hasan, M. Zahid
Nature materials, 10/2021, Volume: 20, Issue: 10Journal Article
Intertwining quantum order and non-trivial topology is at the frontier of condensed matter physics1–4. A charge-density-wave-like order with orbital currents has been proposed for achieving the quantum anomalous Hall effect5,6 in topological materials and for the hidden phase in cuprate high-temperature superconductors7,8. However, the experimental realization of such an order is challenging. Here we use high-resolution scanning tunnelling microscopy to discover an unconventional chiral charge order in a kagome material, KV3Sb5, with both a topological band structure and a superconducting ground state. Through both topography and spectroscopic imaging, we observe a robust 2 × 2 superlattice. Spectroscopically, an energy gap opens at the Fermi level, across which the 2 × 2 charge modulation exhibits an intensity reversal in real space, signalling charge ordering. At the impurity-pinning-free region, the strength of intrinsic charge modulations further exhibits chiral anisotropy with unusual magnetic field response. Theoretical analysis of our experiments suggests a tantalizing unconventional chiral charge density wave in the frustrated kagome lattice, which can not only lead to a large anomalous Hall effect with orbital magnetism, but also be a precursor of unconventional superconductivity.An unconventional chiral charge order is observed in a kagome superconductor by scanning tunnelling microscopy. This charge order has unusual magnetic tunability and intertwines with electronic topology.
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