Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 99: Spins on surfaces at the atomic scale III
O 99.10: Talk
Friday, March 13, 2026, 11:45–12:00, WILL/A317
Spin dynamics of atomic defects in monolayer MoS2 — •Johanna Matusche1,2, Kwan Ho Au-Yeung1,2, Wantong Huang1,2, Paul Greule1,2, Jonas Arnold1,2, Lovis Hardeweg1,2, Máté Stark1,2, Luise Renz1,2, Affan Safeer3, Daniel Jansen3, Jeison Fischer3, Thomas Michely3, Wolfgang Wernsdorfer1,2, Christoph Sürgers1,2, Johannes Schwenk1,2, Wouter Jolie3, and Philip Willke1,2 — 1Physikalisches Institut (PHI), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Center for Integrated Quantum Science and Technology (IQST), Karlsruhe Institute of Technology, Karlsruhe, Germany — 3II. Physikalisches Institut, Universität zu Köln, Köln, Germany
Scanning tunneling microscopy (STM) combined with electron spin resonance (ESR) has enabled coherent control of single ad-atoms and single molecules on surfaces [1]. Additionally, recent studies have revealed that defects in monolayer MoS2 exhibit well-defined spin signatures [2]. In this talk, we combine these two advances for individual point-like defect spins in monolayer MoS2 on graphene/Ir(111): First, we focus on stochastic resonance spectroscopy (SRS) [3] to periodically drive rapid transitions between spin states. This allows to identify the main relaxation mechanisms and to determine the T1 relaxation times. Second, pulsed ESR enables coherent control of the defect spins via Rabi and Ramsey sequences, which provides direct access to their T2 coherence times. [1] K. Yang et al., Science, 366, 509-512 (2019). [2] S. Trishin et al., Phys. Rev. B, 108, 165414 (2023) [3] N. Betz et al., arXiv:2412.12647 (2025).
Keywords: scanning tunneling microscopy; 2D material; stochastic resonance spectroscopy; electron spin resonance