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Carrier Injection and Manipulation of Charge-Density Wave in Kagome SuperconductorCsV3Sb5
Physical Review X  (IF15.762),  Pub Date : 2022-01-03, DOI: 10.1103/physrevx.12.011001
Kosuke Nakayama, Yongkai Li, Takemi Kato, Min Liu, Zhiwei Wang, Takashi Takahashi, Yugui Yao, Takafumi Sato

Kagome metals AV3Sb5 (A=K, Rb, and Cs) exhibit a unique superconducting ground state coexisting with charge-density wave (CDW), whereas how these characteristics are affected by carrier doping remains unexplored because of the lack of an efficient carrier-doping method. Here we report successful electron doping to CsV3Sb5 by Cs dosing, as visualized by angle-resolved photoemission spectroscopy. We found that the electron doping with Cs dosing proceeds in an orbital-selective way, as characterized by a marked increase in electron filling of the Sb 5pz and V 3dxz/yz bands as opposed to the relatively insensitive nature of the V 3dxy/x2y2 bands. By monitoring the temperature evolution of the CDW gap around the M¯ point, we found that the CDW can be completely killed by Cs dosing while keeping the saddle point with the V 3dxy/x2y2 character almost pinned at the Fermi level. The present result suggests a crucial role of multiorbital effect to the occurrence of CDW and provides an important step toward manipulating the CDW and superconductivity in AV3Sb5.