Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: Topology: Poster

TT 35.8: Poster

Wednesday, March 19, 2025, 15:00–18:00, P3

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

Recent experimental work has demonstrated that it is possible to couple superconductors (SCs) to quantum Hall (QH) systems, both at integer and fractional filling fractions. Due to the strong required magnetic fields and the presence of disorder and Abrikosov vortices in the SC, the theoretical modeling of such QH/SC interfaces is not trivial, especially in the case of fractional QH states. In our work, we use the Laughlin edge state theory and realistic models of the superconductor to derive the coupling mechanism at QH/SC interfaces. We explore the effects on normal and Andreev reflection and discuss possible experimental implications.

Keywords: Quantum Hall effect; Andreev reflection