PTCDA molecular monolayer on Pb thin films: An unusual {\pi}-electron Kondo system and its interplay with a quantum-confined superconductor
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.
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Cite
@article{arxiv.2102.11471,
title = {PTCDA molecular monolayer on Pb thin films: An unusual {\pi}-electron Kondo system and its interplay with a quantum-confined superconductor},
author = {Shuangzan Lu and Hyoungdo Nam and Penghao Xiao and Mengke Liu and Yanping Guo and Yusong Bai and Zhengbo Cheng and Jinghao Deng and Yanxing Li and Haitao Zhou and Graeme Henkelman and Gregory A. Fiete and Hong-Jun Gao and Allan H. MacDonald and Chendong Zhang and Chih-Kang Shih},
journal= {arXiv preprint arXiv:2102.11471},
year = {2021}
}
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4 figures