The transport and quantum lifetimes were respectively deduced from low-temperature mobility and Shubnikov–de Haas measurements as a function of carrier density in metal organic vapor phase epitaxy-grown heterostructures. We show experimentally that the lifetime ratio varies as a bell curve, qualitatively confirming a recent theoretical prediction. However the experimental ratio varied much less than was theoretically predicted: From 9 to 19 for carrier densities in range. Moreover, we show the variation of quantum time with carrier density presents some discrepancy with the theoretical study. We also show that transport to quantum lifetime ratio cannot be used alone as a clear figure of merit from heterojunctions.
Quantum and transport lifetimes of two-dimensional electrons gas in heterostructures
P. Lorenzini, Z. Bougrioua, A. Tiberj, R. Tauk, M. Azize, M. Sakowicz, K. Karpierz, W. Knap; Quantum and transport lifetimes of two-dimensional electrons gas in heterostructures. Appl. Phys. Lett. 5 December 2005; 87 (23): 232107. https://doi.org/10.1063/1.2140880
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