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O: Fachverband Oberflächenphysik
O 20: Poster: Spins and Magnetism at Surfaces
O 20.3: Poster
Monday, March 27, 2023, 18:00–20:00, P2/EG
Development of a gate-tunable graphene substrate for spins on surfaces — •Paul Greule1, Máté Stark1, Wantong Huang1, David Collomb1, Daria Sostina2, Christoph Sürgers1, Wolfgang Wernsdorfer1, and Philip Willke1 — 1Physikalisches Institut (PHI), Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Institute of Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology, Karlsruhe, Germany
Single spins on surfaces constitute a promising architecture for future quantum technologies as quantum sensors and possible qubits for quantum information processing. The recent combination of electron spin resonance (ESR) and scanning tunneling microscopy (STM) emerges as a new technique to coherently manipulate spin states on a single atom level [Y. Chen et al., Adv. Mater. 2022, 2107534]. Nevertheless, this architecture does not provide yet any method to continuously tune the coupling between single electron spins. Here, we want to introduce graphene field-effect transistors as a new substrate for ESR-STM on single molecules. Gated graphene devices enable tuning of the charge carrier density of the substrate as already shown by means of scanning tunneling spectroscopy (STS) [Y. Zhang et al., Nature Phys. 5, 722-726 (2009)]. This constitutes a promising way to manipulate the substrate-mediated exchange coupling between single spin centers. We present the development of gated graphene devices for STM using single layer graphene. Moreover, we characterize the samples with in-situ transport measurements and show first topographic and spectroscopic STM measurements.