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TT: Fachverband Tiefe Temperaturen
TT 29: Unconventional Superconductors
TT 29.7: Vortrag
Dienstag, 10. März 2026, 11:00–11:15, CHE/0091
Chiral topological superconductivity in hole-doped Sn/Si(111) — •Matthew Bunney1,2, Lucca Marchetti1, Domenico Di Sante3, Carsten Honerkamp2, and Stephan Rachel1 — 1School of Physics, University of Melbourne, Australia — 2Institute for Theoretical Solid State Physics, RWTH Aachen University, Germany — 3Department of Physics and Astronomy, University of Bologna, Italy
A third monolayer of tin atoms on the semiconductor substrate Si(111) has been shown to become superconducting upon six to ten percent hole doping. Experiments have reported promising results hinting at a superconducting chiral d-wave order parameter. Here we examine Sn/Si(111) by combining most recent ab initio results, quasi-particle interference calculations, state-of-the-art truncated-unity functional renormalization group simulations and Bogoliubov-de Gennes analysis. We show remarkable agreement between experimental and theoretical quasi-particle interference data both in the metallic and superconducting regimes. The interacting phase diagram reveals that the superconductivity is indeed chiral d-wave with Chern number C=4. Surprisingly, magnetically ordered phases are absent, instead we find charge density wave order, as observed in related compounds, as a competing phase. Our results substantiate further that Sn/Si(111) is a promising candidate material for chiral topological superconductivity.
Keywords: Spin Orbit Coupling; STM; QPI; Topology; FRG