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O: Fachverband Oberflächenphysik
O 83: Organic molecules on inorganic substrates: electronic, optical and other properties III
O 83.5: Vortrag
Donnerstag, 12. März 2026, 16:00–16:15, HSZ/0201
Phthalocyanine-based bipartite lattices: Towards a molecular Lieb lattice — •Tzu-Chao Hung1, Luis M. Mateo2, Leo Gross3, Diego Peña2, and Jascha Repp1 — 1University of Regensburg, Germany. — 2Universidade de Santiago de Compostela, Spain. — 3IBM Research Europe - Zurich, Switzerland.
The Lieb lattice is a text-book example of topology governing material properties: Its sublattice imbalance gives rise to extended degenerate states resulting in a flat band. Here, we realize several different covalently bonded phthalocyanine (Pc)-based Lieb-lattice prototypical structures by means of on-surface synthesis. Bond-resolved atomic force microscopy images reveal planar structures with extended π-conjugation. Differential conductance maps, combined with density-functional theory calculations and tight-binding models, confirm strong inter-site electronic coupling and quantum states with symmetry-enforced nodes and symmetry-protected degeneracy. Structures of increasing complexity allow exploring the evolu-tion of these symmetry-derived features.
Keywords: Topology and symmetry-protected material; Molecular Lieb lattice; On-surface synthesis; Scanning probe microscopy; π-conjugated structure