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Title: Unconventional chiral charge order in kagome superconductor KV₃Sb₅
Authors: Jiang, Yu-Xiao
Yin, Jia-Xin
Denner, M. Michael
Shumiya, Nana
Ortiz, Brenden R.
Xu, Gang
Guguchia, Zurab
He, Junyi
Md Shafayat Hossain
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.
M. Zahid Hasan
Keywords: Science::Physics
Issue Date: 2021
Source: Jiang, Y., Yin, J., Denner, M. M., Shumiya, N., Ortiz, B. R., Xu, G., Guguchia, Z., He, J., Md Shafayat Hossain, Liu, X., Ruff, J., Kautzsch, L., Zhang, S. S., Chang, G., Belopolski, I., Zhang, Q., Cochran, T. A., Multer, D., Litskevich, M., ...M. Zahid Hasan (2021). Unconventional chiral charge order in kagome superconductor KV₃Sb₅. Nature Materials, 20, 1353-1357.
Project: NRF-NRFF13-2021-0010
Journal: Nature Materials 
Abstract: Intertwining quantum order and non-trivial topology is at the frontier of condensed matter physics. A charge-density-wave-like order with orbital currents has been proposed for achieving the quantum anomalous Hall effect in topological materials and for the hidden phase in cuprate high-temperature superconductors. 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.
ISSN: 1476-4660
DOI: 10.1038/s41563-021-01034-y
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. This paper was published in Nature Materials and is made available with permission of The Author(s),
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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