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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics

TT 66.4: Talk

Thursday, March 21, 2024, 10:15–10:30, H 3005

Andreev reflection in single-molecule junctions — •Lorenz Meyer, Nicolas Néel, and Jörg Kröger — Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany

Electron transport across a single phthalocyanine (2H-Pc) molecule on Pb(111) is explored with a scanning tunneling microscope. The two variants of the molecule, 2H-Pc and pyrrolic-H abstracted Pc, behave differently when a normal-metal tip is vertically approached. While 2H-Pc shows a gradually increasing zero-bias resonance in spectra of the differential conductance with decreasing tip-molecule separation, spectroscopy of Pc reveals an invariant Bardeen-Cooper-Schrieffer energy gap. These results are discussed in terms of Andreev reflection and the occurrence of Yu-Shiba-Rusinov bound states.

Funding by the Deutsche Forschungsgemeinschaft through Grant No. KR2912/18-1 is acknowledged

Keywords: Scanning tunneling microscopy and spectroscopy; Single-molecule chemical reaction; Phthalocyanine; Point-Contact