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TT: Fachverband Tiefe Temperaturen

TT 85: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics

TT 85.3: Talk

Thursday, March 12, 2026, 15:30–15:45, CHE/0089

Yu-Shiba-Rusinov spectroscopy of triangular molecular trimer on superconducting surface — •Vladislav Pokorný¹, Martin Žonda², and Chao Li^3,4 — ¹FZU - Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 00 Prague 8, Czech Republic — ²Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic — ³Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland — ⁴Institute of Atom Manufacturing, Nanjing University, Suzhou 215163, China

We present a study of a molecular trimer constructed from tetrabromo-tetraazapyrene molecules deposited on a superconducting Pb(111) surface in a triangular geometry. Scanning tunneling spectroscopy reveals a pair of split Yu-Shiba-Rusinov (YSR) states within the superconducting gap as a result of the spinful nature of the molecules [1]. The system is described using a superconducting three-impurity Anderson model with a single superconducting bath. The model is solved using the numerical renormalization group technique, which provides a quantitative description of the experimental result, revealing the doublet nature of the ground state as a result of the intersite capacitive coupling and explains the behavior of the YSR states. We also briefly discuss the possible source of the peak splitting.
[1] C. Li et al., arXiv:2508.05575 (2025).

Keywords: superconductivity; Yu-Shiba-Rusinov; Anderson impurity model; tunneling spectroscopy