Abstract
Hot-electron transport properties of AlxGa1−xAs/GaAs quantum wires under high electric fields are studied by means of the balance-equation approach using a model with multiple species of carriers. Each transverse subband is assumed to have its own electron temperature, Fermi level, and mean drift velocity differing from other nondegenerate subbands. The intersubband Coulomb interactions are taken into account perturbatively for the first time together with acoustic and polar optic phonon scatterings in the numerical calculation. Our calculation shows that although the electron temperatures, Fermi levels, and drift velocities of different subbands differ markedly from each other, the overall average drift velocity and the resultant nonlinear mobility are very close to those predicted by the conventional model assuming single species of carriers in the multisubband quantum wire system.
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