Plasmons in semiconductors and insulators: A simple formula |
| |
Authors: | I Egri |
| |
Institution: | Institut für Theoretische Physik, RWTH Aachen, 5100 Aachen, FRG |
| |
Abstract: | Based on the dielectric function of an excitonic system, a simple model dielectric function is constructed. The high energy zero of this function yields the plasma frequency, and is given by: (hωx)2 = (hωf)2 + Ex2 where ωf is the free electron plasma frequency and Ex the lowest exciton energy. It is argued that this formula is valid for both, Frenkel and Wannier excitons, and comparison is made with experiments on a variety of crystals, ranging from InSb to Ar. In all cases, surprisingly good agreement is found. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|