Changing the Interaction of a Single-Molecule Magnetic Moment with a Superconductor

Abstract

The exchange interaction of a brominated Co-porphyrin molecule with the Cooper pair condensate of Pb(111) is modified by reducing the Co–surface separation. The stepwise dehalogenation and dephenylation change the Co adsorption height by a few picometers. Only the residual Co-porphine core exhibits a Yu-Shiba-Rusinov bound state with low binding energy in the Bardeen-Cooper-Schrieffer energy gap. Accompanying density functional calculations reveal that the Co normald z 2 orbital carries the molecular magnetic moment and is responsible for the intragap state. The calculated spatial evolution of the Yu-Shiba-Rusinov wave function is compatible with the experimentally observed oscillatory attenuation of the electron–hole asymmetry with increasing lateral distance from the magnetic porphine center.

Chirality‐Induced Spin Selectivity: An Enabling Technology for Quantum Applications

“…ii) Quantum gates iii) Chemical engineering of the Hamiltonian [ 7,8,13,30] [ [20][21][22][23] [ 27,31] iv) Quantum algorithms v) Embedded quantum error correction vi) Processability and hybrid structures [28] [ 17, [32][33][34] [ [35][36][37][38][39][40][41][42][43][44] Each column refers to a different achievement/capability. In the different rows, we report the experimental results/schemes, the related molecular structures, and the relevant references.…”

“…perspectives for integration in quantum networks. [50,51] Finally, molecular spins can be processed into hybrid structures and organized on surfaces [35][36][37][38][39][40]43] or within superconducting resonators. [41,42,44] In this context, spin-correlated radical pairs (RPs) generated by photoinduced electron transfer (PET) have also been proposed for quantum information, because of their natural existence in entangled Bell states and the possibility of achieving atomic-scale control and interaction with other degrees of freedom, such as photons, charges and phonons.…”

“…[ 32–34,48,49 ] The ingenious design of the electronic structure has also enabled a promising step toward optical initialization and readout of molecular spin qubits with interesting perspectives for integration in quantum networks. [ 50,51 ] Finally, molecular spins can be processed into hybrid structures and organized on surfaces [ 35–40,43 ] or within superconducting resonators. [ 41,42,44 ]…”