Bonn 2025 – scientific programme

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QI: Fachverband Quanteninformation

QI 6: Quantum Metrology and Sensing (joint session QI/Q)

QI 6.1: Invited Talk

Monday, March 10, 2025, 17:00–17:30, HS VIII

Precision measurement with nanoscale resolution — •Joerg Wrachtrup — University of Stuttgart, Center for Applied Quantum Technologies, 70569 Stuttgart — Max Planck Insitute for Solid State Research, Stuttgart, Germany

Solid state quantum sensors quantitatively measure a variety of parameters on nanometer length scales. In the talk I will show and discuss measurements on correlated electron materials. Recently we were e.g. measuring magnetic order in 2D twisted magnetic monolayers to uncover their Moiré periodicity of magnetization. It turns out that at specific twist angles new magnetic phases beyond the Moiré wavelength emerge which can be interpreted by a gradual modulation of anisotropy parameters. We also probe superconductivity in the 2D limit. We observe fractional vortices in two dimensional 2D NbSe2 superconductors. A close inspection reveals vortex dynamics leading to enhanced dephasing of the quantum spin probe. Our results hint at charge dynamics related to the unconventional band structure of the material.

Keywords: quantum sensing; correlated electron materials; nanoscale