Publication

Resonance width of the light-hole exciton in GaAs-Ga$_{1-x}$Al$_x$As quantum wells

Alfredo Pasquarello
1992
Conference Papers

Abstract

The light-hole exciton in GaAs-Ga $_{1-x}$ Al $_x$ As quantum wells is degenerate with the continuum of the heavy-hole exciton for well widths L < 130 A. The two exciton series are coupled, due to valence-band mixing. Thus the light-hole exciton acquires a resonance broadening. In this work this broadening is calculated. We present two methods which are both based on the diagonalisation of the Hamiltonian on a nite variational basis, chosen in such a way that the discrete as well as the continuum parts of the spectrum are well represented.

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https://infoscience.epfl.ch/entities/publication/316924f6-91cb-4403-90c0-dccce7b70e42

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Alfredo Pasquarello
1992
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/316924f6-91cb-4403-90c0-dccce7b70e42

About this result

Related concepts (27)

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.

Spectral line

A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. Spectral lines are often used to identify atoms and molecules. These "fingerprints" can be compared to the previously collected ones of atoms and molecules, and are thus used to identify the atomic and molecular components of stars and planets, which would otherwise be impossible.

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Resonance width of the light-hole exciton in GaAs-Ga$_{1-x}$Al$_x$As quantum wells

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