Quantum Wire Devices
5.1 Transport in One-Dimensional Electron Systems
As explained in previous chapters, conduction band electrons of n-type semiconductors randomly move around and experience various scattering events. They are scattered either by lattice vibrations or by ionized impurities. The randomness of the electron motion and the scattering results in zero average velocity so that the current through the external contact should be zero. Under external electric fields, these electrons are accelerated in the direction of the electric field in between scattering events. Eventually, the average acceleration process and the average bouncing back due to scattering balance each other, so that the electrons have a ...