Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Poster Wednesday: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy
O 51.9: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Extending the spin excitation lifetime of a magnetic molecule on a proximitized superconductor — •Katerina Vaxevani1, Stefano Trivini1, Jingcheng Li1, Jon Ortuzar1, Dongfei Wang1, Danilo Longo1, and Jose Ignacio Pascual1,2 — 1CIC nanoGUNE-BRTA, 20018 Donostia-San Sebastian, Spain — 2Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
Magnetic molecules adsorbed on surfaces have been used as a platform to individually address and manipulate spins. Long spin-relaxation times are required in order to be able to use atomic spins in quantum information processing and data storage. Normally, coupling of the spin with the conduction electrons of metallic substrates can quench the excited state lifetime and lead to short relaxation times, but the presence of superconducting paring effects in the metal substrate can protect the excited spin from relaxation[1]. Here, we use a substrate of a few monolayers of gold epitaxially grown ontop of an oxygen reconstructed 1x5-V(100) surface to decouple the molecular spin of an iron-porphyrin-chloride from itinerant electrons. The gold film exhibits a proximitized superconducting gap with in-gap de Gennes-Saint James resonances, which protects molecular spin excited states and results into a lifetime of τ=80ns. The spin lifetime decreases with increasing the film thickness due to the gradual gap-closing by the in-gap states. Our results elucidate the use of proximitized gold electrodes for addressing quantum spins on surfaces, envisioning new routes for tuning the value of their spin lifetime.
[1] B. W. Heinrich et al., Nature Physics 9, 765 (2013).