Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 59: Spins on Surfaces at the Atomic Scale I

O 59.3: Talk

Wednesday, March 19, 2025, 11:00–11:15, H6

Fock-Darwin states in tunable artificial atoms with high spin-orbit coupling — •Julian H. Strik, Hermann Osterhage, Kira Junghans, Niels P.E. van Mullekom, Emil Sierda, Anna M.H. Krieg, Danis Badrtdinov, Daniel Wegner, Mikhail I. Katsnelson, Malte Rösner, and Alexander A. Khajetoorians — Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands

Quantum simulators are a pathway to study novel physical phenomena which are difficult to predict or observe in synthesized materials. To date, there is still a lack of viable platforms for quantum simulation to study confined electrons in strong magnetic fields, namely in the limit that the magnetic length is on the order of the Bohr radius. For typical crystals, this corresponds to field strengths that are unattainable in a laboratory.

In this talk I will discuss the magnetic response of atomic-scale quantum dots based on individual Cs atoms on the semiconducting surface of InSb [1]. Using low-temperature scanning tunnelling microscopy and spectroscopy, we pattern quantum dots of various sizes and geometries, by sculpting the potential of the underlying 2DEG. We then study the LDOS of these various structures to an external magnetic field. We relate this to the Fock-Darwin model of atomic states [2]. We review the experimental results in this context and discuss the role of structure size, symmetry and spin-orbit coupling.

[1] E. Sierda, et al, Science 380, 1048 (2023).

[2] L. P. Kouwenhoven et al., Rep. Prog. Phys. 64, 6 (2001).

Keywords: Fock-Darwin; STM; Artificial atom; 2DEG; Landau quantization