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O: Fachverband Oberflächenphysik
O 99: Spins on surfaces at the atomic scale III
O 99.4: Vortrag
Freitag, 13. März 2026, 10:15–10:30, WILL/A317
Exchange-field model for electron spin resonance scanning tunneling microscopy — •Christoph Wolf1,2, Jose Reina-Galvez3, Xue Zhang4, Jan Martinek5, and Nicolas Lorente6 — 1Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea — 2Ewha Womans University, Seoul 03760, Republic of Korea — 3Department of Physics, University of Konstanz, D-78457 Konstanz, Germany — 4Institute of Molecular Physics, Polish Academy of Science, Smoluchowskiego 17, 60-179 Poznan, Poland — 5Spin-X Institute, China University of Technology, Guangzhou, China — 6Centro de Fisica de Materiales, CFM/MPC (CSIC-UPV/EHU), Spain
Since the first experimental demonstration of electron spin resonance in a scanning tunneling microscope the understanding of how spin transitions are driven by oscillating electric fields has gone through several evolutions. In this talk, I will show how an exchange-field model can explain the magnetoelectric coupling between the electric field and a spin impurity. This model is based on an Anderson impurity model and non-equilibrium transport using magnetic electrodes. When the hopping between a magnetic electrode and the impurity is modulated on resonance with the Zeeman splitting one obtains an effective magnetic field that can coherently drive the spin. The sign and magnitude of the exchange field depends on the applied DC bias which gives full control over the position of the resonance and potentially can be used for DC-based quantum-logic operations.
Keywords: Scanning-tunneling microscopy; Anderson Impurity Model; Electron-spin resonance