Physics – Condensed Matter – Materials Science
Scientific paper
2003-08-12
Physics
Condensed Matter
Materials Science
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.92.177402
We present an absorption study of the neutral and positively charged exciton (trion) under the influence of a femtosecond, circularly polarized, resonant pump pulse. Three populations are involved: free holes, excitons, and trions, all exhibiting transient spin polarization. In particular, a polarization of the hole gas is created by the formation of trions. The evolution of these populations is studied, including the spin flip and trion formation processes. The contributions of several mechanisms to intensity changes are evaluated, including phase space filling and spin-dependent screening. We propose a new explanation of the oscillator strength stealing phenomena observed in p-doped quantum wells, based on the screening of neutral excitons by charge carriers. We have also found that binding heavy holes into charged excitons excludes them from the interaction with the rest of the system, so that oscillator strength stealing is partially blocked
Cibert Joel
Gaj Jan A.
Kossacki Piotr
Maslana Wiktor
Plochocka Paulina
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