Chiral kagome superconductivity modulations with residual Fermi arcs

Hanbin Deng, Hailang Qin, Guowei Liu, Tianyu Yang, Ruiqing Fu, Zhongyi Zhang, Xianxin Wu (), Zhiwei Wang (), Youguo Shi (), Jinjin Liu, Hongxiong Liu, Xiao-Yu Yan, Wei Song, Xitong Xu, Yuanyuan Zhao, Mingsheng Yi, Gang Xu, Hendrik Hohmann, Sofie Castro Holbæk, Matteo Dürrnagel, Sen Zhou, Guoqing Chang, Yugui Yao, Qianghua Wang, Zurab Guguchia, Titus Neupert, Ronny Thomale, Mark H. Fischer and Jia-Xin Yin ()
Additional contact information
Hanbin Deng: Southern University of Science and Technology
Hailang Qin: Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area
Guowei Liu: Southern University of Science and Technology
Tianyu Yang: Southern University of Science and Technology
Ruiqing Fu: Chinese Academy of Sciences
Zhongyi Zhang: Hong Kong University of Science and Technology
Xianxin Wu: Chinese Academy of Sciences
Zhiwei Wang: Beijing Institute of Technology
Youguo Shi: Chinese Academy of Sciences
Jinjin Liu: Beijing Institute of Technology
Hongxiong Liu: Chinese Academy of Sciences
Xiao-Yu Yan: Southern University of Science and Technology
Wei Song: Southern University of Science and Technology
Xitong Xu: Chinese Academy of Sciences
Yuanyuan Zhao: Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area
Mingsheng Yi: Huazhong University of Science and Technology
Gang Xu: Huazhong University of Science and Technology
Hendrik Hohmann: University of Wurzburg
Sofie Castro Holbæk: University of Zurich
Matteo Dürrnagel: University of Wurzburg
Sen Zhou: Chinese Academy of Sciences
Guoqing Chang: Nanyang Technological University
Yugui Yao: Beijing Institute of Technology
Qianghua Wang: Nanjing University
Zurab Guguchia: Paul Scherrer Institute
Titus Neupert: University of Zurich
Ronny Thomale: University of Wurzburg
Mark H. Fischer: University of Zurich
Jia-Xin Yin: Southern University of Science and Technology

Nature, 2024, vol. 632, issue 8026, 775-781

Abstract: Abstract Superconductivity involving finite-momentum pairing1 can lead to spatial-gap and pair-density modulations, as well as Bogoliubov Fermi states within the superconducting gap. However, the experimental realization of their intertwined relations has been challenging. Here we detect chiral kagome superconductivity modulations with residual Fermi arcs in KV3Sb5 and CsV3Sb5 using normal and Josephson scanning tunnelling microscopy down to 30 millikelvin with a resolved electronic energy difference at the microelectronvolt level. We observe a U-shaped superconducting gap with flat residual in-gap states. This gap shows chiral 2a × 2a spatial modulations with magnetic-field-tunable chirality, which align with the chiral 2a × 2a pair-density modulations observed through Josephson tunnelling. These findings demonstrate a chiral pair density wave (PDW) that breaks time-reversal symmetry. Quasiparticle interference imaging of the in-gap zero-energy states reveals segmented arcs, with high-temperature data linking them to parts of the reconstructed vanadium d-orbital states within the charge order. The detected residual Fermi arcs can be explained by the partial suppression of these d-orbital states through an interorbital 2a × 2a PDW and thus serve as candidate Bogoliubov Fermi states. In addition, we differentiate the observed PDW order from impurity-induced gap modulations. Our observations not only uncover a chiral PDW order with orbital selectivity but also show the fundamental space–momentum correspondence inherent in finite-momentum-paired superconductivity.

Date: 2024
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DOI: 10.1038/s41586-024-07798-y

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