Andreev reflection in Si-engineered Al/InGaAs hybrid junctions
Silvano De Franceschi, Francesco Giazotto, Fabio Beltram, Lucia Sorba, Marco Lazzarino, Alfonso Franciosi
Abstract
Andreev-reflection dominated transport is demonstrated in Al/n-In0.38Ga0.62As superconductor-semiconductor junctions grown by molecular beam epitaxy on GaAs(001). High junction transparency was achieved in low-doped devices by exploiting Si interface bilayers to suppress the native Schottky barrier. It is argued that this technique is ideally suited for the fabrication of ballistic transport hybrid microstructures.
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