Direct observation of tunneling between Landau levels in barrier-separated two-dimensional electron-gas systems

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Abstract
We have investigated the tunneling processes between two systems of independently contacted quantized states. Shifting the two systems energetically with respect to each other, we were able to observe transitions between different subbands on both sides of the barrier as a series of peaks in the derivative of the tunneling current dI/dV. If a magnetic field is applied perpendicular to the sample, additional peaks are resolved in dI/dV. These peaks are unambiguously identified as tunneling processes between different Landau levels on both sides of the barrier.