THE DIELECTRIC FUNCTION OF AN ELECTRON SYSTEM IN A PERIODIC STRUCTURE: VAA THEORY+ |
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| Authors: | Deng-ping XUE De-xin LU Chien-hua TSAI |
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| Institution: | 1. Institute of Solid State Physics, Nanjing University, Nanjing, China;
2. Department of Physics, Chiao-tung University, Shanghai |
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| Abstract: | A general expression for the dielectric function of an electron system in a period structure has been derived by using linear response theory with the assumption that the equilibrium electronic density differs slight1y from its average value. Starting from the BBGKY equations,the theory is formulated in the Velocity Average Approximation.Numerical results for the dispersion and damping of plasmons and for the longitudinal dielectric function are given in the case of sinusoidally modulated structures. |
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