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Coupling between a magnetic impurity and an external bath can give rise tomany-body quantum phenomena, including Kondo and Hund's impurity states inmetals, and Yu-Shiba-Rusinov states in superconductors. While advances havebeen made in probing the magnetic properties of d-shell impurities on surfaces,the confinement of f orbitals makes them difficult to access directly. Here weshow that a 4f driven Kondo resonance can be modulated spatially by asymmetriccoupling between a metallic surface and a molecule containing a 4f-like moment.Strong hybridisation of dysprosium double-decker phthalocyanine with Cu(001)induces Kondo screening of the central magnetic moment. Misalignment betweenthe symmetry axes of the molecule and the surface induces asymmetry in themolecule's electronic structure, spatially mediating electronic access to themagnetic moment through the Kondo resonance. This work demonstrates theimportant role that molecular ligands play in mediating electronic and magneticcoupling and in accessing many-body quantum states.

Sub-molecular modulation of a 4f driven Kondo resonance by surface-induced asymmetry