1. PTCDA Molecular Monolayer on Pb Thin Films: An Unusual π -Electron Kondo System and Its Interplay with a Quantum-Confined Superconductor
- Author
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Y. M. Li, Hyoungdo Nam, Hong-Jun Gao, Yusong Bai, Shuangzan Lu, Gregory A. Fiete, Graeme Henkelman, Allan H. MacDonald, Chendong Zhang, Penghao Xiao, Yanping Guo, Jinghao Deng, Haitao Zhou, Chih-Kang Shih, Zhengbo Cheng, and Mengke Liu
- Subjects
Physics ,Superconductivity ,Condensed matter physics ,Magnetic moment ,Magnetism ,Condensed Matter - Superconductivity ,Superlattice ,Lattice (group) ,General Physics and Astronomy ,02 engineering and technology ,Electron ,021001 nanoscience & nanotechnology ,01 natural sciences ,Quantum dot ,Condensed Matter::Superconductivity ,0103 physical sciences ,Bound state ,010306 general physics ,0210 nano-technology - Abstract
The hybridization of magnetism and superconductivity has been an intriguing playground for correlated electron systems, hosting various novel physical phenomena. Usually, localized d- or f-electrons are central to magnetism. In this study, by placing a PTCDA (3,4,9,10-perylene tetracarboxylic dianhydride) molecular monolayer on ultra-thin Pb films, we built a hybrid magnetism/superconductivity (M/SC) system consisting of only sp electronic levels. The magnetic moments reside in the unpaired molecular orbital originating from interfacial charge-transfers. We reported distinctive tunneling spectroscopic features of such a Kondo screened pi-electron impurity lattice on a superconductor in the regime of TK>>delta suggesting the formation of a two-dimensional bound states band. Moreover, moir\'e superlattices with tunable twist angle and the quantum confinement in the ultra-thin Pb films provide easy and flexible implementations to tune the interplay between the Kondo physics and the superconductivity, which are rarely present in M/SC hybrid systems., Comment: 4 figures
- Published
- 2021