Band splitting and enhanced charge density wave modulation in Mn-implanted CsV3Sb5

Xiaoxu Lei; Pengdong Wang; Mengjuan Mi; Yan Zhang; Aixi Chen; Liwu Cai; Ting Wang; Rong Huang; Yilin Wang; Yiyao Chen; Fang-Sen Li

doi:10.1039/d3na00216k

Band splitting and enhanced charge density wave modulation in Mn-implanted CsV₃Sb₅

Nanoscale Adv. 2023 Apr 17;5(10):2785-2793. doi: 10.1039/d3na00216k. eCollection 2023 May 16.

Authors

Xiaoxu Lei^{1

2}, Pengdong Wang², Mengjuan Mi³, Yan Zhang⁴, Aixi Chen², Liwu Cai^{2

5}, Ting Wang^{1

2}, Rong Huang², Yilin Wang³, Yiyao Chen², Fang-Sen Li^{1

2}

Affiliations

¹ School of Nano-Tech and Nano-Bionics, University of Science and Technology of China Hefei 230026 China.
² Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences Suzhou 215123 China fsli2015@sinano.ac.cn yychen2021@sinano.ac.cn.
³ School of Microelectronics, Shandong Technology Center of Nanodevices and Integration, State Key Laboratory of Crystal Materials, Shandong University Jinan 250100 China yilinwang@email.sdu.edu.cn.
⁴ CAS Key Laboratory of Nanophotonic Materials and Devices, Key Laboratory of Nanodevices and Applications, i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences Suzhou 215123 China.
⁵ Nano Science and Technology Institute, University of Science and Technology of China Suzhou 215123 China.

Abstract

Kagome metal CsV₃Sb₅ has attracted unprecedented attention due to the charge density wave (CDW), Z₂ topological surface states and unconventional superconductivity. However, how the paramagnetic bulk CsV₃Sb₅ interacts with magnetic doping is rarely explored. Here we report a Mn-doped CsV₃Sb₅ single crystal successfully achieved by ion implantation, which exhibits obvious band splitting and enhanced CDW modulation via angle-resolved photoemission spectroscopy (ARPES). The band splitting is anisotropic and occurs in the entire Brillouin region. We observed a Dirac cone gap at the K point but it closed at 135 K ± 5 K, much higher than the bulk value of ∼94 K, suggesting enhanced CDW modulation. According to the facts of the transferred spectral weight to the Fermi level and weak antiferromagnetic order at low temperature, we ascribe the enhanced CDW to the polariton excitation and Kondo shielding effect. Our study not only offers a simple method to realize deep doping in bulk materials, but also provides an ideal platform to explore the coupling between exotic quantum states in CsV₃Sb₅.