Chiral kagome superconductivity modulations with residual Fermi arcs

• 成果类型: Article
• 署名作者: Deng, Hanbin; Qin, Hailang; Liu, Guowei; Yang, Tianyu; Fu, Ruiqing; Zhang, Zhongyi; Wu, Xianxin; Wang, Zhiwei; Shi, Youguo; Liu, Jinjin; Liu, Hongxiong; Yan, Xiao-Yu; Song, Wei; Xu, Xitong; Zhao, Yuanyuan; Yi, Mingsheng; Xu, Gang; Hohmann, Hendrik; Holbaek, Sofie Castro; Duerrnagel, Matteo; Zhou, Sen; Chang, Guoqing; Yao, Yugui; Wang, Qianghua; Guguchia, Zurab; Neupert, Titus; Thomale, Ronny; Fischer, Mark H.; Yin, Jia-Xin
• 署名单位: Southern University of Science & Technology; Chinese Academy of Sciences; Institute of Theoretical Physics, CAS; Hong Kong University of Science & Technology; Beijing Institute of Technology; Beijing Institute of Technology; Chinese Academy of Sciences; Chinese Academy of Sciences; Institute of Physics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Songshan Lake Materials Laboratory; Chinese Academy of Sciences; Hefei Institutes of Physical Science, CAS; Huazhong University of Science & Technology; Huazhong University of Science & Technology; University of Wurzburg; University of Zurich; Swiss Federal Institutes of Technology Domain; ETH Zurich; Nanyang Technological University; Nanjing University; Nanjing University; Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute
• 刊物名称: Nature
• ISSN/ISSBN: 0028-5439
• DOI: 10.1038/s41586-024-07798-y
• 发表日期: 2024-08-22
• 关键词: pair-density-wave; state; ORDER

摘要

Superconductivity involving finite-momentum pairing(1) 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 x 2a spatial modulations with magnetic-field-tunable chirality, which align with the chiral 2a x 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 x 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.