Optical-Properties and Switching Behavior of Excited Iii-V Semiconductors near the Direct Indirect Cross-Over
In highly excited semiconductor systems near the transition from direct to indirect band structure (cross-over) the energetic distance between different conduction band minima is a nonmonotonous function of the excitation intensity. A theoretical explanation of this experimental result is given. Our investigations are based on the evaluation of photoluminescence spectra using a careful lineshape analysis. The nonmonotony is a consequence of the unequal shrinkage of the direct and indirect gaps as a function of the population of energetically comparable conduction band valleys in a material near cross-over. In the situation discussed an optical switching mechanism is expected, which is explained with special respect to its switching time. Important problems of electron-electron interaction are discussed.
WOS:A1992JR28400043
1992
173
1
441
452
Ecole polytech fed lausanne,inst phys appl,ch-1015 lausanne,switzerland. Gurtler, s, univ leipzig,fachbereich phys,inst festkorperphys,linnestr 5,o-7010 leipzig,germany.
ISI Document Delivery No.: JR284
Cited Reference Count: 16
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