Abstract
We have investigated the tunneling processes between two independently contacted 2D electron gas systems, which can be shifted energetically with respect to each other. With in-plane magnetic fields, the conservation of the canonical momentum results in a new and giant splitting of the subband resonance peaks, being one order of magnitude larger than the cyclotron energy. If a magnetic field is applied perpendicular to the planes of the sample, however, the increased scattering rate inside the barrier leads to a violation of the momentum conservation rules. Therefore tunneling processes between different Landau levels on both sides of the barrier are also observed.
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