Homogeneous Electron Gas
The use of diagram techniques in many-particle physics began in the early 1950s, soon after their introduction into field theory. Although these methods were applied to a variety of problems, some areas of work were more successful than others. The two areas which enjoyed early success were the homogeneous electron gas and the polaron problem. Later there were other successes such as the theories of superconductivity and superfluidity. However, the theory of the homogeneous electron gas, as it was initially understood, was worked out by many contributors during the period 1957–1958. They brought a variety of theoretical approaches to this problem, but all used diagrammatic techniques in some form. On the other hand, during the past twenty years, there has been achieved an understanding of electronelectron interactions in strongly correlated metals. This latter topic is covered in the next chapter.
KeywordsDielectric Function Ground State Energy Correlation Energy Random Phase Approximation Pair Distribution Function
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