Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 42: Molecular Magnetism and Magnetic Particles / Clusters II
MA 42.2: Vortrag
Donnerstag, 12. März 2026, 09:45–10:00, HSZ/0004
Graphene-based quantum heterospin graphs — Gabriel Martínez-Carracedo1, Amador García-Fuente1, László Oroszlány2, •László Szunyogh3, and Jaime Ferrer1 — 1Universidad Oviedo, Spain — 2Eötvös Loránd University, Budapest, Hungary — 3Budapest University of Technology and Economics, Hungary
Harnessing quantum-regime functionalities without relying on rare-earth elements represents an important step toward developing globally accessible quantum technologies. In this contribution, we investigate a range of low-dimensional open quantum spin systems constructed from magnetic nanographene structures containing spin-1/2 and spin-1 triangulenes and/or olympicenes. These graphene nanostructures act as localized spins and can be effectively modeled using a quantum bilinear*biquadratic Heisenberg Hamiltonian. We compute the energy spectrum and the quantum numbers associated with the low-energy eigenstates. We identify a double degeneracy in the total spin quantum number S of the first excited state in three-leg spin graphs (3-LSGs) and in other heterospin nanostructures. This degeneracy depends on both the number of sites and the spin species, and arises from a swapping-transformation symmetry of the Hamiltonian. Numerical simulations further show that this degeneracy remains largely robust in N=7 spin-1 3-LSGs under realistic perturbations relevant to experimental conditions. [1]
[1] G. Martínez-Carracedo et al., DOI: 10.1103/v3fm-lvsh (2025)
Keywords: quantum spin systems; graphene triangulenes; Heisenberg spin model