Resonant tunneling in magnetic field: Evidence for space-charge buildup

The standard model of double-barrier resonant tunneling structures inadequately describes the experimental current-voltage curves. When applied to experiments on resonant tunneling in quantizing magnetic fields, it leads to incorrect values of the electron effective mass in the well. We show that the space-charge formation, both in the electrodes and in the well, not considered previously, is, in fact, very important. We present a model which takes into account these effects. The calculations, based on our model, are in good agreement with the experimental results.