Effect of disorder on the temperature dependence of radiative lifetimes in V-groove quantum wires

We have studied the effect of disorder on the radiative properties of semiconductor quantum wires by time-resolved photoluminescence spectroscopy. The dependence of the radiative lifetimes is measured over a temperature range extending from 8 to 150 K. At low temperatures we find that the measured dependence does not conform to the theoretical prediction for recombination of free excitons in a quasi-one-dimensional system due to the major influence of disorder. An extension of the theory is developed in order to take into account exciton ionization and the contribution of free carriers. A mean localization length for excitons is also estimated from the radiative lifetime at 8 K. [S0163-1829(99)12903-5].


Published in:
Physical Review B, 59, 4, 2910-2914
Year:
1999
ISSN:
1098-0121
Keywords:
Note:
Ecole Polytech Fed Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland. Oberli, DY, Ecole Polytech Fed Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland. Daniel.Oberli@epfl.ch
ISI Document Delivery No.: 164KL
Times Cited: 26
Cited Reference Count: 29
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