Isointensity plot of spectrally and temporally resolved photoluminescence of an InAs/GaAs structur with quantum dots measured with a streak-camera, at T = 10 K:

• - Vertical axis: time in picoseconds.
• - Horizontal axis: energy in electron-volts.
• - Colors scale is proportional to the logarithm of the PL intensity.

Some physical observations:

1. The quantum dots band is visible between 1.33 eV and 1.48 eV. The high-energy wing of this band is due to excited states and it decays very fast. The low-energy wing (the ground states) has long lifetime (about 300 ps).
2. GaAs free-electron to carbon acceptor transition is at 1.49 eV,
3. Sharp excitonic lines of the GaAs barrier are at 1.51 eV,
4. Other interesting data: K. Korona, A. Babiński, S. Raymond Z. Wasilewski, “Dynamics of Excitation Transfer Inside InAs/GaAs Quantum Dot System", Acta Phys. Pol. A 110, p. 219 (2006).
   

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Zakład Fizyki Ciała Stałego (ZFCS) - Division of Solid State Physics

Last update: 8 VII 2005 ...