Aharonov-Bohm interference probing of chiral Andreev edge states via scanning gate microscopy

We theoretically investigate the spatial response of chiral Andreev edge states at a quantum Hall-superconductor interface probed by scanning gate microscopy. Using the Bogoliubov-de Gennes formalism, we demonstrate that the localized potential of the scanning gate tip decouples the chiral Andreev edge states from the superconductor into independent electron and hole paths. In the ν=2 regime, this local separation forces the quasiparticles to accumulate a relative magnetic phase in the normal region, resulting in Aharonov-Bohm-type conductance oscillations that are captured by a geometric analytical model. At higher filling factors (e.g., ν=4), the tip progressively interacts with spatially distinct edge channels, dynamically altering the Andreev-induced mode mixing and modifying the transport resonances. Furthermore, we show that these highly localized interferometric signatures survive in the presence of disorder, even when conventional non-local transport oscillations are masked.