Excitons in Solids
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The lectures here are concerned with excitations to the N-body system instead of the N±1-body system which is the normal result of an energy band calculation. Thus one has to investigate the two-body Green’s function formation and not stop with the single-particle function. In the first two lectures the Green’s function formalism is used to construct a set of Bethe-Salpeter equations from which the excitation energies and corresponding Bethe-Salpeter amplitudes are deduced . The third part will describe one of the excited states that can be obtained using a laser beam on a semiconductor, namely the quantum mechanical fluid composed entirely of electrons and holes . The exciton mechanism of superconductivity  and experimental evidence  are the subjects of the last lecture. This last part is still under study and the lecture will point out the current situation.
KeywordsFermi Surface Dielectric Function Correlation Energy Metal Electron Exciton Mechanism
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