Microphotoluminescence study of local temperature fluctuations in n-type (Cd,Mn)Te quantum well |
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Authors: | A Golnik P Kossacki W Ma?lana M Kutrowski |
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Institution: | a Institute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warszawa, Poland b Institute of Physics, PAS, al. Lotników 32/46, 02-668 Warszawa, Poland |
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Abstract: | Microphotoluminescence mapping measurements were performed in a magnetic field on a (Cd,Mn)Te quantum well, modulation n-doped with iodine at about 1010 cm−2. Photoluminescence spectra contain neutral (X0) and negatively charged (X−) exciton lines. The Zeeman effect shows a significant role of heating of the Mn system even under lowest excitation densities. The effective temperature of the magnetic system exhibits strong fluctuations anticorrelated with the total intensity of PL signal. An interpretation of these fluctuations in terms of the influence of non-radiative recombination centers is proposed (in two alternative versions). Maps of the local X0/X− intensity ratio indicate a minor role of electrostatic potential fluctuations. |
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Keywords: | 61 72 Lk 71 35 Pq 71 55 Gs 78 55 Et 78 67 De |
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