Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 90: Spins on Surfaces at the Atomic Scale II
O 90.10: Talk
Thursday, March 20, 2025, 17:15–17:30, H11
Control of the Landau-Zener Gap in Atomic Structures — •Piotr Kot1,2, Yaowu Lei1,2, Valeria Sheina1,2, We-hyo Seo1,2, Andreas Heinrich1,2, and Soo-hyon Phark1,2 — 1Center for Quantum Nanoscience, Institute for Basic Science, Seoul, South Korea — 2Department of Physics, Ewha Womans University, Seoul, South Korea
Avoided crossings in quantum systems have been shown to be a useful tool for the study of qubits and the actualization of faster qubit operations. This is done by taking advantage of Landau-Zener transitions, allowing one to measure quantum interferometric effects. However, implementing these techniques in on surface atoms has not yet been demonstrated experimentally, and is a crucial next step for studying this new class of spin qubits. Here we present preliminary steps towards studying quantum interferometric effects in Ti dimers using electron spin resonance scanning tunnelling microscopy. Firstly, we have fine-tuned the Landau-Zener gap in our dimers by studying the dipole and exchange interaction between the atoms. We have found that only several dimers have the correct gap magnitude for our experimental conditions. Secondly, we have found that by using three atom structures we are able to position the avoided crossing within our range of interest. Experiments in the near future will include measuring Landau-Zener transitions, Stueckelberg oscillations and quantum interferometry maps.
Keywords: ESR-STM; Quantum Interferometry; Spin Qubit; Landau-Zener; Coherent Control