Abstract: Abstract : The controversy over whether the optical gap of a polymer is increased or decreased by the electron-electron interaction can be clarified by studying the effect of the screened Coulomb interaction on the correlation function of the excited states. Since the competition between the diagonal and off-diagonal parts of the electron interaction depends on the screening, the screening becomes the decisive factor in determining the dependence of the optical gap of the electron interaction. Our theory shows that the electron interaction with...
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Topics: 
Condensed matter physics
Atomic physics
Molecular physics