PTCDA Molecular Monolayer on Pb Thin Films: An Unusual π -Electron Kondo System and Its Interplay with a Quantum-Confined Superconductor
| Autor: | 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, Mengke Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
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 |
| Zdroj: | Physical Review Letters. 127 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|