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 51.5: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Magnetic molecule as a parity sensor in entangled spin and YSR excitation on a superconductor — •Jon Ortuzar1, Stefano Trivini1, Katerina Vaxevani1, Jingchen Li5, Ane Garro1, Miguel Angel Cazadilla3, Sebastian Bergeret2,3, and José Ignacio Pascual1,4 — 1CIC nanoGUNE-BRTA, San Sebastián, Spain — 2Centro de Física de Materiales (CFM-MPC), San Sebastián, Spain — 3Donostia International Physics Center (DIPC), San Sebastián, Spain — 4Ikerbasque, Bilbao, Spain — 5School of Physics, Sun Yat-sen University, Guangzhou, China
A magnetic molecule coupled to a superconductor induces Yu-Shiba-Rusinov (YSR) bound states, detected by tunneling spectroscopy as long-lived quasiparticle excitations inside the superconducting gap [1]. The degeneracy of the system can be lifted by intrinsic magnetic anisotropy so that entangled spin and YSR excitations are possible [2]. We tune the exchange coupling between a FeTPP-Cl molecule and the proximitized Au(100)/V substrate to go through a Quantum Phase Transition from an unscreened half-integer spin (even parity) system to a screened integer spin (odd parity) system [3]. We use a single site superconductor model [4] to prove the capability to detect the parity of the system, getting fundamental insight into the interplay of YSR and spin excitation.
[1] B. W. Heinrich, et. al., Prog. Surf. Sci.93, 1 (2018) [2] N. Hatter, et. al., Nat. Commun.6, 8988 (2015) [3] S. Kezilebieke, et. al., Nano Lett.19, 4614 (2019) [4] F. von Oppen and K. J. Franke, Phys. Rev. B103, 205424 (2021).