Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Molecular Magnetism
MA 6.3: Vortrag
Montag, 18. März 2024, 10:15–10:30, EB 301
Real-Space Imaging of Triplon Excitations in Engineered Quantum Magnets — •Robert Drost1, Shawulienu Kezilebieke2, Jose Lado1, and Peter Liljeroth1 — 1Aalto University, Department of Applied Physics — 2University of Jyväskylä, Department of Physics, Department of Chemistry, and Nanoscience Center
Despite the absence of long-range order, quantum magnetic ground states result from the inter-actions of spins at the nanoscale. It is thus possible to rationally design quantum magnets with pre-defined properties from simple ingredients. Organo-metallic molecules provide highly flexible spin systems. This flexibility makes them ideal candidate building blocks for designer quantum magnets. One example of fundamental excitations in quantum magnets are triplons. These dispersive triplet modes result form the internal excitations in the building blocks. Here, we show that triplon excitations can be produced in designer quantum systems and probed in real space using scanning tunneling microscopy (STM). We achieve this using assemblies of metal phthalocyanine molecules with an internal singlet-triplet transition. We further show that the dispersion bandwidth of triplons is strongly correlated with the dimensionality of the molecular assembly as expected from dispersive many-body modes. Our experiments show that arrays of metal-organic molecules are efficient platforms to simulate quantum magnets and study their excitations in a simplified setting.
Keywords: Designer quantum materials; Scanning tunnelling microscopy; Triplon excitations