Chiral kagome superconductivity modulations with residual Fermi arcs

Deng, Hanbin1; Qin, Hailang2; Liu, Guowei1; Yang, Tianyu1; Fu, Ruiqing3; Zhang, Zhongyi4; Wu, Xianxin3; Wang, Zhiwei5,6; Shi, Youguo7,8,9,10; Liu, Jinjin5,6; Liu, Hongxiong7,8,9; Yan, Xiao-Yu1; Song, Wei1; Xu, Xitong11; Zhao, Yuanyuan2; Yi, Mingsheng12,13; Xu, Gang12,13; Hohmann, Hendrik14; Holbaek, Sofie Castro15; Duerrnagel, Matteo14,16; Zhou, Sen3; Chang, Guoqing17; Yao, Yugui5,6; Wang, Qianghua18,19; Guguchia, Zurab20; Neupert, Titus15; Thomale, Ronny14; Fischer, Mark H.15; Yin, Jia-Xin1,2

2024-08-22

10.1038/s41586-024-07798-y

NATURE   影响因子和分区

0028-0836

1476-4687

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.

SCI

英语

第一 ; 通讯

National Key R&D Program of China["2023YFA1407300","2023YFF0718403","2021YFA1401500","2022YFA1403400","2020YFA0308800","2022YFA1403800"] ; National Science Foundation of China["12374060","12374147","92365023","12047503","12374153","12274154"] ; Guangdong Provincial Quantum Science Strategic Initiative[GDZX2201001] ; Beijing Natural Science Foundation[Z210006] ; Beijing National Laboratory for Condensed Matter Physics[2023BNLCMPKF007] ; National Research Foundation, Singapore, under its Fellowship Award[NRF-NRFF13-2021-0010] ; Agency for Science, Technology and Research (A*STAR) under its Manufacturing, Trade and Connectivity (MTC) Individual Research Grant (IRG)[M23M6c0100] ; Singapore Ministry of Education (MOE) AcRF Tier 2[MOE-T2EP50222-0014] ; NSFC[12321004] ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)["258499086 - SFB 1170","449872909","390858490 - EXC 2147"] ; Swiss National Science Foundation (SNSF) through SNSF Starting Grant[TMSGI2_211750] ; Swiss National Science Foundation (SNSF) through Division II[207908] ; Swiss National Science Foundation["200021E_198011","FOR 5249","TMCG-2_213805"]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001300596600002

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Web of Science

1.Southern Univ Sci & Technol, Dept Phys, Shenzhen, Peoples R China
2.Quantum Sci Ctr Guangdong Hong Kong Macao Greater, Shenzhen, Peoples R China
3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing, Peoples R China
4.Hong Kong Univ Sci & Technol, Dept Phys, Clear Water Bay, Hong Kong, Peoples R China
5.Beijing Inst Technol, Ctr Quantum Phys, Sch Phys, Key Lab Adv Optoelect Quantum Architecture & Measu, Beijing, Peoples R China
6.Beijing Inst Technol, Beijing Key Lab Nanophoton & Ultrafine Optoelect S, Beijing, Peoples R China
7.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing, Peoples R China
8.Chinese Acad Sci, Inst Phys, Beijing, Peoples R China
9.Univ Chinese Acad Sci, Beijing, Peoples R China
10.Songshan Lake Mat Lab, Dongguan, Peoples R China
11.Chinese Acad Sci, Hefei Inst Phys Sci, Anhui Key Lab Condensed Matter Phys Extreme Condit, High Magnet Field Lab, Hefei, Peoples R China
12.Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan, Peoples R China
13.Huazhong Univ Sci & Technol, Sch Phys, Wuhan, Peoples R China
14.Univ Wurzburg, Inst Theoret Phys & Astrophys, Wurzburg, Germany
15.Univ Zurich, Dept Phys, Zurich, Switzerland
16.Swiss Fed Inst Technol, Inst Theoret Phys, Zurich, Switzerland
17.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore, Singapore
18.Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing, Peoples R China
19.Nanjing Univ, Sch Phys, Nanjing, Peoples R China
20.Paul Scherrer Inst, Lab Muon Spin Spect, Villigen, Switzerland

Deng, Hanbin,Qin, Hailang,Liu, Guowei,et al. Chiral kagome superconductivity modulations with residual Fermi arcs[J]. NATURE,2024,632(8026).

Deng, Hanbin.,Qin, Hailang.,Liu, Guowei.,Yang, Tianyu.,Fu, Ruiqing.,...&Yin, Jia-Xin.(2024).Chiral kagome superconductivity modulations with residual Fermi arcs.NATURE,632(8026).

Deng, Hanbin,et al."Chiral kagome superconductivity modulations with residual Fermi arcs".NATURE 632.8026(2024).