| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Chiral Pair Density Waves with Residual Fermi Arcs in RbV$_{3}$Sb$_{5}$ |
| Xiao-Yu Yan1†, Hanbin Deng1†, Tianyu Yang1†, Guowei Liu1, Wei Song1, Hu Miao2, Zhijun Tu3,4 Hechang Lei3,4, Shuo Wang5,6, Ben-Chuan Lin5,6, Hailang Qin7*, and Jia-Xin Yin1,7* |
1Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3Beijing Key Laboratory of Optoelectronic Functional Materials MicroNano Devices, Department of Physics, Renmin University of China, Beijing 100872, China
4Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China, Beijing 100872, China
5Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
6Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
7Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area, Shenzhen 518055, China
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| Cite this article: |
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Xiao-Yu Yan, Hanbin Deng, Tianyu Yang et al 2024 Chin. Phys. Lett. 41 097401 |
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Abstract The chiral $2\times 2$ charge order has been reported and confirmed in the kagome superconductor RbV$_{3}$Sb$_{5}$, while its interplay with superconductivity remains elusive owing to its lowest superconducting transition temperature $T_{\scriptscriptstyle{\rm C}}$ of about 0.85 K in the AV$_{3}$Sb$_{5}$ family (A = K, Rb, Cs) that severely challenges electronic spectroscopic probes. Here, utilizing dilution-refrigerator-based scanning tunneling microscopy down to 30 mK, we observe chiral $2\times 2$ pair density waves with residual Fermi arcs in RbV$_{3}$Sb$_{5}$. We find a superconducting gap of 150 µeV with substantial residual in-gap states. The spatial distribution of this gap exhibits chiral $2\times 2$ modulations, signaling a chiral pair density wave (PDW). Our quasi-particle interference imaging of the zero-energy residual states further reveals arc-like patterns. We discuss the relation of the gap modulations with the residual Fermi arcs under the space-momentum correspondence between PDW and Bogoliubov Fermi states.
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Received: 16 July 2024
Express Letter
Published: 13 August 2024
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| PACS: |
74.20.Rp
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(Pairing symmetries (other than s-wave))
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