Magneto-Tunneling Between 2-Dimensional Systems

Abstract

Non-resonant and resonant Landau-level tunneling between strongly confined 2D-systems is investigated in a magnetic field. Non-resonant tunneling through a single barrier is studied in a parallel magnetic field at the boundary between electric field domains in a doped superlattice. Above 7 T a breakdown of perturbation theory appears in the magnetic field induced misaligment of the energy levels. Resonant Landau-level tunneling in a perpendicular magnetic field is observed in an undoped superlattice with optically excited carriers. Due to the strong confinement of the GaAs wells tunneling between the lowest Landau level and Landau levels with an index up to 9 in the neighboring well is detected. The selection rule of conserving the Landau level index is broken by elastic scattering or phonon assisted tunneling.