Abstract
We consider, theoretically, resonant multi-mode pumping induced by a coherent far infrared field, in a ballistic quantum channel, created in a gated GaAs/AlGaAs heterostructure. For frequencies that enable momentum conservation in a transition between the lowest and a higher mode, we predict complete depopulation of the lowest mode, due to Rabi oscillations. These frequencies are characteristic of the mode spectrum and are therefore closely related to the confining potential. If all but the lowest modes are filtered out by a quantum point contact, we expect the depopulation effect to completely block the transport of current. In addition to providing a spectroscopic tool we believe that the resonance effect may find use as a THz frequency demodulator or as a transistor device.
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