Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 89: Spins on surfaces at the atomic scale II
O 89.10: Talk
Thursday, March 12, 2026, 17:15–17:30, WILL/A317
Decoupling strategies for YPc2 molecular spin qubit platforms on metal surfaces — Franklin H. Cho1,2, Soyoung Oh1,2,3, Dan Chi Nguyen1,2, Jinjoo Lee1,2, We-hyo Soe1,2, Luciano Colazzo1,2, Jisoo Yu1,2, Pierre Josse1,2, Caroline Hommel1,2, Lukas Spree1,2, Christoph Wolf1,2, and •Fabio Donati1,2 — 1IBS Center for Quantum Nanoscience, South Korea — 2Ewha Womans University, South Korea — 3The Clarendon Laboratory, University of Oxford, The United Kingdom
Yttrium phthalocyanine double-decker (YPc2) is an appealing building block for surface spin-qubit architectures due to its delocalized S=1/2 radical and planar structure [1]. Here, we investigated the morphology, electronic structure, and spin properties of single- and multi-layer YPc2 on Cu(111) single crystals and on zinc phthalocyanine (ZnPc) grown on Cu(111). Low temperature scanning tunneling microscopy reveals the molecular layer structure and the variation of its electronic configuration when directly adsorbed on Cu(111) versus on a ZnPc decoupling layer [2]. X-band electron spin resonance using our custom-built surface-sensitive spectrometer [3] shows that the YPc2 radical is preserved on ZnPc but quenched upon direct contact with Cu(111). Density functional theory attributes this quenching to the hybridization of molecular orbitals with the substrate electrons. Our study highlights the necessity of suitable decoupling layers to preserve radical spins near metallic surfaces. [1] F. Branzoli et al., Phys. Rev. B 83, 174419 (2011). [2] S. Oh et al., Nanoscale 17, 22163 (2025). [3] F. H. Cho et al., Rev. Sci. Instrum. 95, 063904 (2024).
Keywords: Molecular Spin Qubits; Electron Spin Resonance; Scanning Tunneling Microscopy; Molecular heterostructures; Spins on surfaces