Nonlinear transport in GaAs/AlAs harmonically confined quantum wires

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Abstract
The linear and nonlinear resistivities of GaAs/AlAs quantum wires under an applied magnetic field normal to the interfaces are obtained using the balance equation technique. Inelastic scattering by optic-confined and interface vibrational modes are analyzed. The observed sharp peaks in the linear resistivity showing phonon resonances in the scattering by bulk modes is broadened if this scattering is due to the GaAs confined modes. On the other hand, the AlAs-like interface modes add new peaks to the resistivity. The electron cooling effect is weakened at the magnetophonon resonance due to the greatly enhanced intersubband transition.