Publication

Resonant femtosecond emission from quantum well excitons: The role of Rayleigh scattering and luminescence

Benoît Marie Joseph Deveaud, Stefan Haacke
1997
Journal Articles

Abstract

We study the ultrafast properties of secondary radiation of semiconductor quantum wells under resonant excitation. We show that the exciton density dependence allows one to identify the origin of secondary radiation. At high exciton densities, the emission is due to incoherent luminescence with a rise time determined by exciton-exciton scattering. For low densities, when the distance between excitons is much larger than their diameter, the temporal shape is independent of density and rises quadratically, in excellent agreement with recent theories for resonant Rayleigh scattering.

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https://infoscience.epfl.ch/entities/publication/907a2ef7-5c1f-4f19-9f10-ff8e355ff562

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Benoît Marie Joseph Deveaud, Stefan Haacke
1997
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/907a2ef7-5c1f-4f19-9f10-ff8e355ff562

About this result

Related concepts (32)

Photoluminescence

Photoluminescence (abbreviated as PL) is light emission from any form of matter after the absorption of photons (electromagnetic radiation). It is one of many forms of luminescence (light emission) and is initiated by photoexcitation (i.e. photons that excite electrons to a higher energy level in an atom), hence the prefix photo-. Following excitation, various relaxation processes typically occur in which other photons are re-radiated.

Exciton

An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and some liquids. The exciton is regarded as an elementary excitation of condensed matter that can transport energy without transporting net electric charge. An exciton can form when a material absorbs a photon of higher energy than its bandgap. This excites an electron from the valence band into the conduction band.

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.

Related publications (32)

Resonant femtosecond emission from quantum well excitons: The role of Rayleigh scattering and luminescence

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