Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies IV

O 43.1: Talk

Wednesday, March 20, 2024, 10:30–10:45, MA 004

A scanning quantum sensor for atomic-scale electric and magnetic fields — •Taner Esat^1,2, Dmitriy Borodin^3,4, Jeongmin Oh^3,4, Andreas Heinrich^3,4, Stefan Tautz^1,2,5, Yujeong Bae^3,4, and Ruslan Temirov^1,2,6 — ¹Peter Grünberg Institute (PGI-3), Forschungszentrum Jülich; Jülich, Germany — ²Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology; Jülich, Germany — ³Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS); Seoul 03760, South Korea — ⁴Department of Physics, Ewha Womans University; Seoul 03760, South Korea — ⁵Experimentalphysik IV A, RWTH Aachen University; Aachen, Germany — ⁶Faculty of Mathematics and Natural Sciences, Institute of Physics II, University of Cologne; Cologne, Germany

In this work, we report the fabrication of a quantum sensor delivering atomic resolution and single-spin sensitivity, assembled atom-by-atom at the apex of an ultra-high vacuum low temperature scanning tunnelling microscope (STM) tip. Our quantum sensor consists of a magnetic tip with an aromatic molecule attached by atomic-scale manipulation, forming a quantum mechanical two-level system in an external magnetic field. It is addressable by STM-based electron spin resonance and allows readout by tunneling magnetoresistance. We demonstrate the functionality of the quantum sensor by measuring the magnetic and electric dipole fields emanating from a single Fe atom and an Ag2 dimer with sub-microvolt energy and simultaneous atomic-scale spatial resolution.

Keywords: Quantum sensor; Atomic-scale manipulation; Electron spin resonance (ESR); Scanning tunnelling microscope (STM)