Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 90: Spins on Surfaces at the Atomic Scale II
O 90.6: Talk
Thursday, March 20, 2025, 16:15–16:30, H11
Many-body effects in impurity spectroscopy using ESR-STM — •Christoph Wolf1,2, Xue Zhang3, Jose Reina-Galvez1,2, Jan Martinek4, and Nicolas Lorente5,6 — 1Center for Quan tum Nanoscience, Institute for Basic Science (IBS), Seoul, Korea — 2Ewha Womans University, Seoul, Korea — 3Spin-X Institute, China University of Technology, Guangzhou, China — 4Institute of Molecular Physics, Polish Academy of Science, Poland — 5Centro de Fisica de Materiales, CFM/MPC (CSIC-UPV/EHU), Spain — 66Donostia International Physics Center (DIPC), Spain
Recent advances in understanding how harmonic electric fields drive coherent spin transitions in the ESR-STM have lead to a re-evaluation of experimentally observed phenomena in the ESR-STM spectra of atomic and molecular spin adsorbed on ultrathin insulating layers. In this talk, I will show the most up to date development of our transport approach, which is based on a single-orbital Anderson impurity model attached to magnetic leads. I will focus on two aspects: first, the DC bias control of the resonance frequency of the ESR transition, which can be interpreted as an exchange bias field. This allows the full physical characterization of the adsorbate spin and the junction parameters in ESR-STM. All simulations are qualitatively and quantitatively evaluated against experimental data of individual titanium atoms and Iron(II)phthalocyanine molecules which are prototypical spin-1/2 qubits. Second, I will discuss the optimization of quantum-coherent control in the low-current regime, which shows a distinct optimum for the quantum-bit figure of merit ΩT2.