Damping of plasma waves in two-dimensional electron systemsdue to contacts

摘要

We report on the numerical study of plasma waves in two-dimensional electron systems with contacts using the kineticelectron transport model. We simulate the time- and position-dependence of plasma waves in the system by initially addingsmall perturbation of the electron concentration from the steady state. We demonstrate that in such a system the damping ofplasma waves caused by "out of phase" electrons exiting thechannel through the contacts occur. We find that the dampingrate is proportional to the electron average velocity and inverselyproportional to the channel length.