Summary
Transmission measurements on highly excited thin CdS crystals give evidence not only of destruction of exciton absorption lines, but also of a negative-absorption region (optical gain). Its high-energy border (13 meV below theA,n=1 exciton) almost independent of excitation is indicative of an e-h liquid even at 77 K, though emission profiles are not in good agreement.
Riassunto
Le misure di trasmissione in cristalli sottili di CdS altamente eccitati danno prova non solo della distruzione delle linee di assorbimento dell’eccitone, ma anche di una regione ad assorbimento negativo (guadagno ottico). Il suo limite ad alta energia (13 meV al di sotto dell’eccitoneA,n=1) quasi indipendente dall’eccitazione è indicativo di un liquido e-h anche a 77 K, sebbene i profili di emissione non siano in buon accordo.
Резюме
Измерения прохождения излучьно возбужденных тонких кристаллах CdS подтверждают не только деструкцию поглощения, связанного с экситоном, но также область отрицательного поллощения (оптическое усиление). Высокоэнергетичская граница, которая почти не зависит от возбуждения, является признаком электрон-дырочной Зидкости даже при 77 К, хотя профили излучения не дают удовлетворительного соответствия.
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Egorov, V.D., Müller, G.O., Weber, H.H. et al. Spontaneous and stimulated emission from e-h plasmas in CdS. Nuov Cim B 39, 628–633 (1977). https://doi.org/10.1007/BF02725802
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DOI: https://doi.org/10.1007/BF02725802