SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Molecular Magnetism II
MA 24.2: Vortrag
Mittwoch, 29. März 2023, 09:45–10:00, HSZ 02
Electrically driven singlet-triplet transition in triangulene spin-1 chains — Gabriel Martínez-Carracedo1,2, •László Oroszlany3,4, Amador García-Fuente1,2, László Szunyogh5,6, and Jaime Ferrer1,2 — 1Universidad de Oviedo, Oviedo, Spain — 2CINN, Universidad de Oviedo-CSIC, El Entrego, Spain — 3Eotvos Lorand University, Budapest, Hungary — 4MTA-BME Lendulet Topology and Correlation Research Group, Budapest University of Technology and Economics, Budapest, Hungary — 5Budapest University of Technology and Economics, Budapest, Hungary — 6ELKH-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Budapest, Hungary
Recently, graphene triangulene chains have been synthesized and their magnetic response has been analyzed by STM methods by Mishra and coworkers (Nature 598, 287 (2021)). Motivated by this study, we determine the exchange bilinear and biquadratic constants of the triangulene chains by calculating two-spin rotations in the spirit of the magnetic force theorem. We then analyze open-ended, odd-numbered chains, whose edge states pair up forming a triplet ground state. We propose three experimental approaches that enable us to trigger and control a singlet-triplet spin transition. Two of these methods are based on applying a mechanical distortion to the chain. We finally show that the transition can be controlled efficiently by the application of an electric field.