Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 74: Nanostructures at surfaces: Other aspects

O 74.3: Talk

Wednesday, March 14, 2018, 17:15–17:30, MA 141

Spin control induced by molecular charging in a transport junction — Sujoy Karan^1,2, •Carlos García³, Michael Karolak⁴, David Jacob^5,6, Nicolás Lorente^3,7, and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany — ²Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany — ³Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain — ⁴Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ⁵Departamento de Física de Materiales, Universidad del País Vasco, UPV/EHU, Av. Tolosa 72, 20018 San Sebastián, Spain — ⁶IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain — ⁷Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain

We present experiments and calculations showing that the molecular electron affinity influences its spin transport. We use a scanning tunnelling microscope to trap a meso-substituted iron porphyrin, putting the iron centre in an environment that provides control of its charge and spin states. A large electron affinity of peripheral ligands is shown to enable switching of the molecular S = 1 ground state found at low electron density to S = 1/2 at high density, while lower affinity keeps the molecule inactive to spin-state transition. These results pave the way for spin control using chemical design and electrical means.