Multipair Excitations and Dynamic Response of the Metallic Electron Gas in Two and Three Dimensions
We demonstrate, using a quantitative microscopic formalism, that multipair excitations significantly affect the dynamic response of the electron gas even for densities as high as rs = 2 in the bulk. For the two-dimensional electron gas in GaAs/GaAlAs heterostructures we find that the effects of multipair excitations are even more pronounced, indicating that the standard single particle description of 2D electron systems should be used with caution. We discuss the essential role that multipair contributions at high frequency play in maintaining the frequency moment sum rules for the dynamic response of the electron gas.
KeywordsGaAs Gallium Arsenide
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