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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 Cazalilla^4,5, and José Ignacio Pascual^1,5 — 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.