Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 61: Organic molecules on inorganic substrates: electronic, optical and other properties II

O 61.9: Talk

Wednesday, March 11, 2026, 17:00–17:15, HSZ/0201

Chiral recognition of enantiomers on a superconducting surface — •Lorenz Meyer, Nicolas Néel, and Jörg Kröger — Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany

The adsorption of a racemic mixture of heptahelicene on Pb(111) gives rise to enantiopure domains, in which left-handed and right-handed variants are spatially resolved with submolecular structure. For molecules inside the domains the molecular spiral is oriented along the surface normal, while at domain boundaries the spiral axis is tilted. Both enantiomers leave the Bardeen-Cooper-Schrieffer energy gap of the substrate invariant and exhibit an elevated energy difference between the occupied and unoccupied frontier orbitals. Funding by the Deutsche Forschungsgemeinschaft through KR 2912/21-1 and the Bundesministerium für Bildung und Forschung is acknowledged.

Keywords: Scanning Tunneling Microscopy; Chiral molecules; Single molecules; Superconductivity