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1. Calculate the transmission properties of a sandwich where the middle material has its conduction band at the same energy as the outer layers but has a different effective mass. The conduction band can be like this at heterojunctions between Si_xGe_1-x.
Is it possible for electrons to be trapped in a sandwich like this?

2. How significant is the different effective mass for a typical barrier of AlGaAs in GaAs, with a height of about 0.3 eV?

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