Abstract
Some fundamental aspects of the issues underlying certain longstanding controversies concerning the Beattie-Landsberg theory of interband Auger recombination in semiconductors are studied. The participation of collective and single-particle excitations in the determination of the processes is clarified. The essential role played by collective electronic-density fluctuations as the mediating agent in the energy and momentum conservation for the Coulomb Auger processes is emphasized. The fundamental differences that exist in the physical pictures underlying the Coulomb and exchange Auger processes are brought out in detail by using a diagrammatic formulation of the recombination processes. The exact expression for the recombination rate is derived on the basis of the random-phase approximation.
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