Publication

Spontaneous Emission of Highly Excited Gaas/(Ga,Al)as Quantum-Wells

Jean-Louis Staehli
1992
Journal Articles

Abstract

We report on a transparent analysis of the luminescence spectra of dense electron-hole plasmas confined in GaAs/(Ga,Al)As quantum wells. We fit the spectra using the fact that the total number of particle states does not depend on collision broadening. Further, the effective dispersion of the valence and conduction subbands and the dependence of the optical matrix elements on wavevector is accounted for. We find (a) that the lowest subbands shift almost rigidly with changing plasma density, and (b) that the theoreticallly calculated band gap shrinkage (random phase approximation) is always higher than the experimental values.

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https://infoscience.epfl.ch/entities/publication/0fb5462c-dd4b-40d4-a6a3-f2b96e562a61

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Jean-Louis Staehli
1992
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0fb5462c-dd4b-40d4-a6a3-f2b96e562a61

About this result

Related concepts (32)

Quantum dot

Quantum dots (QDs) – also called semiconductor nanocrystals, are semiconductor particles a few nanometres in size, having optical and electronic properties that differ from those of larger particles as a result of quantum mechanics. They are a central topic in nanotechnology and materials science. When the quantum dots are illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conductance band.

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