2003/11/25 by Jacek Szczytko, J. Szczytko, L. Kappei +6 · 1 citation
Engineering · Physics and Astronomy · #Semiconductor Quantum Structures and Devices #Spectroscopy and Quantum Chemical Studies #Terahertz technology and applications #cond-mat
paper · pdf · doi:10.1103/physrevlett.93.137401
arxiv created 2003/11/25 · openalex publication_date 2004/09/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present the results of a detailed time-resolved luminescence study carried out on a very high quality InGaAs quantum well sample where the contributions at the energy of the exciton and at the band edge can be clearly separated. We perform this experiment with a spectral resolution and a sensitivity of the setup, allowing us to keep the observation of these two separate contributions over a broad range of times and densities. This allows us to directly evidence the exciton formation time, which depends on the density as expected from theory. We also denote the dominant contribution of excitons to the luminescence signal, and the lack of thermodynamical equilibrium at low densities.