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TT: Fachverband Tiefe Temperaturen
TT 83: Topology: Quantum Hall Systems
TT 83.4: Vortrag
Donnerstag, 12. März 2026, 15:45–16:00, HSZ/0105
Superconducting Beam Splitting of Quantum Hall Edge States for HOM Interference — •Maxime Jamotte1, Tom Menei1, Alexander Zyuzin2, Manohar Kumar2, and Thomas L. Schmidt1 — 1University of Luxembourg, Luxembourg, Luxembourg — 2Aalto University, Aalto, Finland
Electron interferometers have proven to be important tools for characterizing the exchange statistics of quantum Hall edge states. Moreover, it has recently become possible to proximitize quantum Hall edge states using superconductors. This opens a new avenue for interferometers based on the particle-hole degree of freedom. We propose a Hong-Ou-Mandel interferometer in which an s-wave type-II superconductor is located between two graphene systems in a magnetic field, with chiral edge states serving as the interferometer arms. Local and crossed Andreev processes hybridize electron and hole edge excitations, producing delocalized electron-hole pairs. Using a microscopic tight-binding Bogoliubov-de Gennes model, we simulate the injection of subgap electrons and compute anti-bunching probabilities and current cross-correlations, revealing how normal and Andreev processes shape the interferometric signatures of this new hybrid geometry.
Keywords: Quantum Hall–superconductor hybrids; Andreev processes; Two-particle interferometry; Shot noise and correlations; Topological quantum transport