Andreev reflection in Si-engineered Al/InGaAs hybrid junctions
  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. 
Silvano De Franceschi (1), Francesco Giazotto (1) and Fabio Beltram   (1), Lucia Sorba (2), Marco Lazzarino (2) and Alfonso ...