Publication

Theory of ultrafast Rayleigh scattering in semiconductor quantum wells

Benoît Marie Joseph Deveaud, Vincenzo Savona, Stefan Haacke
2000
Journal Articles

Abstract

The Rayleigh scattering of light at resonance with the ground state exciton transition in quantum wells is studied by means of a microscopic model. The disorder-induced localization of the exciton center-of-mass leads to characteristic features of the scattered intensity which can help understanding the outcome of secondary emission experiments. In particular, the connection between time-resolved scattering and energy-level statistics, and the enhancement of the backscattered intensity in angle-resolved measurements are discussed.

Official source

https://infoscience.epfl.ch/entities/publication/25762996-83b6-4fa6-87bb-7e25e78a38be

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Benoît Marie Joseph Deveaud, Vincenzo Savona, Stefan Haacke
2000
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/25762996-83b6-4fa6-87bb-7e25e78a38be

About this result

Related concepts (31)

Raman scattering

Raman scattering or the Raman effect (ˈrɑːmən) is the inelastic scattering of photons by matter, meaning that there is both an exchange of energy and a change in the light's direction. Typically this effect involves vibrational energy being gained by a molecule as incident photons from a visible laser are shifted to lower energy. This is called normal Stokes Raman scattering. The effect is exploited by chemists and physicists to gain information about materials for a variety of purposes by performing various forms of Raman spectroscopy.

Quantum well

A quantum well is a potential well with only discrete energy values. The classic model used to demonstrate a quantum well is to confine particles, which were initially free to move in three dimensions, to two dimensions, by forcing them to occupy a planar region. The effects of quantum confinement take place when the quantum well thickness becomes comparable to the de Broglie wavelength of the carriers (generally electrons and holes), leading to energy levels called "energy subbands", i.e.

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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Theory of ultrafast Rayleigh scattering in semiconductor quantum wells

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