Angle-resolved photoemission spectroscopy study on kagome superconductor AV3Sb5 (A = K, Rb, Cs)

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Abstract
The recently discovered kagome superconductors AV3Sb5 (A= K, Rb, Cs) provide a new platform to explore intertwined symmetry-breaking orders. However, great controversies exist to date, including the origin of charge density wave (CDW), the unconventional or conventional nature of superconductivity, and the presence or absence of time-reversal symmetry breaking. A thorough understanding of the fundamental electronic structure is crucial for addressing these disputes. In this review, we provide an extensive summary of the key structural and electronic properties of AV3Sb5 compounds and evaluate the current research on their unconventional electronic order, especially the superconductivity and CDW, with a particular focus on insights from angle-resolved photoemission spectroscopy studies. We expect this review to be timely due to the convergence of various experimentally observed phenomena related to the CDW and superconducting order parameters in AV3Sb5 compounds. Our goal is to guide future investigations aimed at uncovering the microscopic origins of these unconventional electronic properties in kagome superconductors.
Funding Information
  • National Natural Science Foundation of China (12074163)
  • Basic and Applied Basic Research Foundation of Guangdong Province (2022B1515020046)
  • National Key Research and Development Program of China (2022YFA1403700)
  • Guangdong Provincial Introduction of Innovative Research and Development Team (2017ZT07C062)
  • China Postdoctoral Science Foundation (2020M682780)
  • Natural Science Foundation of Liaoning Province (2023-BSBA-085)
  • the Fundamental Research Funds for the Central Universities (DUT24RC(3)039)

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