Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 2
O 71.5: Vortrag
Donnerstag, 8. September 2022, 16:15–16:30, S051
Many-body Excitations of a Quantum Spin on a Proximitized Superconductor — Stefano Trivini1, •Jon Ortuzar1, Katerina Vaxevani1, Jingchen Li2, Ane Garro1, F. Sebastian Bergeret3, Miguel.A Cazalilla4,5, and José Ignacio Pascual1,5 — 1CICnanoGUNE, San Sebastian,Spain — 2School of Physics, Sun Yat-sen University, Guangzhou 510275, China — 3Centro de Fìsica de Materiales (CFM-MPC), 20018 San Sebastiàn, Spain — 4Donostia International Physics Center (DIPC), 20018 San Sebastian, Spain — 5Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
In magnetic molecules intrinsic magnetic anisotropy breaks spin degeneracy, allowing inelastic spin excitations that can be protected by a superconducting gap. The coupling of the spin to the superconductor induces Yu-Shiba-Rusinov (YSR) states, detected by scanning tunnelling microscopy (STM) as long-lived quasiparticles excitations inside the superconducting gap.
Here, we observe the signature of both described excitations in an Fe-porphyrin adsorbed on a Au/V(100) proximitized superconducting surface. We found that the STM tip affects in a similar way both in-gap and out-gap states, hint that they are correlated. Solving an effective Hamiltonian of the system, we describe the observed signals as multiple excitations of entangled states formed by the molecular spin and superconductor.