Resonant inter-Landau-level tunneling of electrons and holes in superlattices

Abstract

Inter-Landau-level tunneling of electrons and holes between two-dimensional (2D) systems is investigated in GaAs/AlAs superlattices. In one sample resonances due to electron tunneling up to Δ n = 9 ( n is the Landau level index) are observed. The corresponding Landau fan can be constructed when conduction-band nonparabolicities are included. In a second sample resonances due to inter-Landau-level tunneling of holes are identified. The experimental esults are discussed in view of the complex valence-band structure in the magnetic field.