Publisher's Synopsis
Excerpt from Collective Modes in an Inhomogeneous Electron Gas
It is known that a free electron gas exhibits an undamped collective oscillation at the well established plasma frequency. We would like to study how an external potential affects the collective oscillation. In order for a collective mode to be well enough defined to be observed experimentally, it must not be heavily damped.
This implies that, in particular, it is important to know how the inhomogeneity of the system affects the lifetime of the collective mode.
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