Chern Fermi pocket, topological pair density wave, and charge-4e and charge-6e superconductivity in kagomé superconductors.
Chern Fermi pocket, topological pair density wave, and charge-4e and charge-6e superconductivity in kagomé superconductors.
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DOI：
10.1038/s41467-022-34832-2
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发表时间：
2022-11-26
影响因子：
16.6
通讯作者：
Wang, Ziqiang
中科院分区：
文献类型：
--
作者：
Zhou, Sen;Wang, Ziqiang
The recent discovery of novel charge density wave (CDW) and pair density wave (PDW) in kagomé lattice superconductors AV3Sb5 (A = K, Rb, Cs) hints at unexpected time-reversal symmetry breaking correlated and topological states whose physical origin and broader implications are not understood. Here, we make conceptual advances toward a mechanism behind the striking observations and new predictions for novel macroscopic phase coherent quantum states. We show that the metallic CDW state with circulating loop currents is a doped orbital Chern insulator near van Hove filling. The emergent Chern Fermi pockets (CFPs) carry concentrated Berry curvature and orbital magnetic moment. We find that the pairing of electrons on the CFPs leads to a superconducting state with an emergent vortex-antivortex lattice and the formation of a complex triple-Q PDW. A plethora of correlated and topological states emerge, including a never-before-encountered chiral topological PDW superconductor, a loop-current pseudogap phase, and vestigial charge-4e and charge-6e superconductivity in staged melting of the vortex-antivortex lattice and hexatic liquid crystal. Our findings reveal previously unknown nature of the superconducting state of a current-carrying Chern metal, with broad implications for correlated and topological materials. The recent discovery of novel charge density wave (CDW) and pair density wave (PDW) in kagome superconductors (SC) AV3Sb5 motivates theoretical study of these phenomena. Here, the authors propose that the CDW state is an orbital Chern metal, leading to a SC state with a chiral PDW, the melting of which leads to vestigial electronic orders including charge-4e and 6e SC.
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影响因子：
19.6
作者：
Agterberg, D. F.;Tsunetsugu, H.
通讯作者：
Tsunetsugu, H.
DOI：
10.1088/0022-3719/6/7/010
发表时间：
1973-01-01
期刊：
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS
影响因子：
--
作者：
Kosterlitz, JM;Thouless, DJ
通讯作者：
Thouless, DJ
影响因子：
19.6
作者：
Berg, Erez;Fradkin, Eduardo;Kivelson, Steven A.
通讯作者：
Kivelson, Steven A.
影响因子：
19.6
作者：
Kang, Mingu;Fang, Shiang;Comin, Riccardo
通讯作者：
Comin, Riccardo
影响因子：
12.5
作者：
Lee, Patrick A.
通讯作者：
Lee, Patrick A.