Pump–probe analysis of polaron decay in InAs/GaAs self-assembled quantum dots |
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Authors: | P Boucaud S Sauvage F Bras G Fishman J-M Ortga J-M Grard |
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Institution: | aInstitut d’Électronique Fondamentale, UMR CNRS 8622, Bâtiment 220, Université Paris-Sud, 91405 Orsay, France;bCLIO-Lure, Bâtiment 209 D, Université Paris Sud, 91405 Orsay France;cCEA-Grenoble, DRFMC-PSC, 38054 Grenoble Cedex 9, France |
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Abstract: | We report on polaron decay in InAs/GaAs self-assembled quantum dots. The polarons are probed by pump–probe spectroscopy through their optical intersublevel absorption around 62 meV (20 μm wavelength). A T1 polaron lifetime of the order of tens of picosecond is deduced from the low-temperature pump–probe measurements. We show that a long-lived component can be additionally observed on the pump–probe measurements. The spectral dependence of this long-lived component is, however, not correlated to the polaron absorption. It is thus not a signature of polaron relaxation quenching. The origin of this long-lived component is attributed to the two-phonon absorption of the bulk GaAs substrate. |
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Keywords: | Quantum dots Polaron Relaxation |
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