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TT: Fachverband Tiefe Temperaturen

TT 61: Topology – Poster

TT 61.9: Poster

Mittwoch, 11. März 2026, 15:00–17:00, P4

Andreev reflection and interferometry of fractional quantum Hall edge states — •Tom Menei, Maxime Jamotte, and Thomas L. Schmidt — Department of Physics and Materials Science, University of Luxembourg, Luxembourg

Recent experimental work has demonstrated the possibility of coupling superconductors (SCs) to quantum Hall (QH) systems at both integer and fractional filling factors. However, the theoretical modelling of such QH/SC interfaces remains challenging due to the strong magnetic fields required and the presence of disorder. In this work, we develop a theoretical framework based on fractional QH edge state theory and incorporate realistic models of the superconductor to derive the effective coupling mechanisms at the interface. We analyse the resulting normal and Andreev reflection processes, as well as correlations probed through interference between multiple edge states across the QH/SC interface, and discuss their signatures in transport experiments.

Keywords: Quantum Hall effect; Andreev reflection; Electron interferometry; Bosonization