Abstract
We calculate the rate at which electrons bound in asymmetric semiconductor quantum wells are scattered out of the well by absorption or emission of polar optical phonons. The 2-D to 3-D nature of the scattering is included. The final states after scattering are states which carry current either to the right or left. We find that rates for scattering out of the well can be significantly smaller than bulk scattering rates. We also show that asymmetries in the well shape result in a directional dependence for the final state current. That is, electrons scatter out preferentially to the left or to the right depending on the details of the well potential.
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