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- Title
Atomic-scale magnetic doping of monolayer stanene by revealing Kondo effect from self-assembled Fe spin entities.
- Authors
Kumar, Nitin; Lan, Ye-Shun; Jang, Iksu; Lin, Yen-Hui; Chen, Chia-Ju; Lin, Tzu-Hsuan; Jeng, Horng-Tay; Chang, Po-Yao; Hsu, Pin-Jui
- Abstract
Atomic-scale spin entity in a two-dimensional topological insulator lays the foundation to manufacture magnetic topological materials with single atomic thickness. Here, we have successfully fabricated Fe monomer, dimer and trimer doped in the monolayer stanene/Cu(111) through a low-temperature growth and systematically investigated Kondo effect by combining scanning tunneling microscopy/spectroscopy (STM/STS) with density functional theory (DFT) and numerical renormalization group (NRG) method. Given high spatial and energy resolution, tunneling conductance (dI/dU) spectra have resolved zero-bias Kondo resonance and resultant magnetic-field-dependent Zeeman splitting, yielding an effective spin Seff = 3/2 with an easy-plane magnetic anisotropy on the self-assembled Fe atomic dopants. Reduced Kondo temperature along with attenuated Kondo intensity from Fe monomer to trimer have been further identified as a manifestation of Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between Sn-separated Fe atoms. Such magnetic Fe atom assembly in turn constitutes important cornerstones for tailoring topological band structures and developing magnetic phase transition in the single-atom-layer stanene.
- Subjects
KONDO effect; DOPING agents (Chemistry); MAGNETIC transitions; SCANNING tunneling microscopy; MAGNETIC structure; MAGNETIC films
- Publication
NPJ Quantum Materials, 2024, Vol 9, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-024-00647-1