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O: Fachverband Oberflächenphysik
O 15: Spins on surfaces at the atomic scale I
O 15.7: Vortrag
Montag, 9. März 2026, 16:45–17:00, WILL/A317
Landau-Zener transitions of multilevel atomic spins — •Lukas Veldman1,2, Henrik Lichtl1,2, Nicolaj Betz1,2, Johannes Schust1, Laëtitia Farinacci1,3, Fernando Delgado4, Susanne Baumann1,2, and Sebastian Loth1,2 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies — 2Center for Integrated Quantum Science and Technology (IQST), University of Stuttgart — 3Carl Zeiss Stiftung Center for Quantum Photonics — 4Instituto de Estudios Avanzados IUDEA, Departamento de Física, Universidad de La Laguna, Tenerife, Spain
The ability to perform Landau-Zener (LZ) transitions is a powerful and relatively unexplored tool to study and control spins on the nanoscale. LZ transitions provide spectroscopic information about energy level crossings, state populations and can even be used as a driving mechanism for coherent control over quantum spin states. In an idealized picture of a two level system (TLS), these qualities can be relatively easily understood via the LZ model. Here, we show LZ transitions on antiferromagnetic Fe chains on Cu2N/Cu(100) induced by ramping the magnetic field emanating from the tip of a scanning tunneling microscope (STM). Using real time measurement of the spin state we distinguish between classical and quantum tunneling transition processes. We find that avoided level crossings in higher excited states play a significant role in the dynamics between the ground states, showcasing the necessity to go beyond the TLS approximation used in the standard LZ model.
Keywords: Landau-Zener; Scanning tunneling microscopy; Spin dynamics