title: Switching Molecular Kondo Effect via Supramolecular Interaction.
abstract: We apply supramolecular assembly to control the adsorption configuration of Co-porphyrin molecules on Au(111) and Cu(111) surfaces. By means of cryogenic scanning tunneling microscopy, we reveal that the Kondo effect associated with the Co center is absent or present in different supramolecular systems. We perform first-principles calculations to obtain spin-polarized electronic structures and compute the Kondo temperatures using the Anderson impurity model. The switching behavior is traced to varied molecular adsorption heights in different supramolecular structures. These findings unravel that a competition between intermolecular interactions and molecule-substrate interactions subtly regulates the molecular Kondo effect in supramolecular systems.
authors.affiliation: Department of Physics, The Hong Kong University of Science and Technology , Hong Kong, China.
authors.forename: Qiushi
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Department of Physics, The Hong Kong University of Science and Technology , Hong Kong, China.
authors.forename: Guowen
authors.initials: G
authors.lastname: Kuang
authors.affiliation: Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Pang
authors.affiliation: Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China.
authors.forename: Xingqiang
authors.initials: X
authors.lastname: Shi
authors.affiliation: Department of Physics, The Hong Kong University of Science and Technology , Hong Kong, China.
authors.forename: Nian
authors.initials: N
authors.lastname: Lin
keywords: Anderson impurity model; Kondo effect; density-functional theory; scanning tunneling spectroscopy; supramolecular self-assembly