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TUE: Tuesday Contributed Sessions

TUE 12: Quantum Sensing and Decoherence: Contributed Session to Symposium III

TUE 12.5: Vortrag

Dienstag, 9. September 2025, 15:15–15:30, ZHG105

Sensing Spins on Surfaces and Following them into Chemical Bonds with Scanning Probe Microscopy — •Dmitriy Borodin — IBS Center for Quantum Nanoscience, Seoul, South Korea

Spins on surfaces have been recently proposed as a promising qubit platform and also for atomic-scale quantum sensing. Control and readout are enabled by single atom electron spin resonance via scanning tunneling microscopes (ESR-STM).

In this work we show that quantum sensing can be enabled by following the electron spin resonance of a single molecule bound to the tip of a scanning probe microscope. We demonstrate that weak electrostatic and magnetic fields of single atomic objects can be quantified with sub-angstrom spatial resolution. The atomic-scale quantum sensor if universally applicable to conductive surfaces.

The spin lifetimes and phase coherence times (T1 and T2) of atomic spins on surfaces were so far limited by electron scattering with the metal - a limitation of STM based spin detection. Therefore, we have implemented sensing of single atom spins using the magnetic exchange force (MxF) between a magnetic tip and an ad-atom on the surface. Surprisingly, studying the spin-spin interaction we observe pattern that reflect the formation of a chemical bond between the surface bound atom and the magnetic atom at the tip.

Keywords: atomic-sclae quantum sensing; spins on surfaces; scanning probe microscopy; chemical bonding; decoherence