Publication

Temperature dependence of the photoluminescence lifetime in disordered quantum wires

Benoît Marie Joseph Deveaud, Vincenzo Savona
2004
Conference Papers

Abstract

We present a theoretical model of the time-resolved excitonic photoluminescence in quantum wires. We study the role of disorder on the temperature dependence of the photoluminescence lifetime. We find that at low temperature the exciton population is not thermalized in disordered quantum wires and that the lifetime is mainly determined by the localization length of the exciton. However for large localization lengths or high enough temperatures the exciton population thermalizes within its lifetime and the temperature dependence becomes square root like.

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https://infoscience.epfl.ch/entities/publication/efe7a4f9-4164-4f21-919c-31590ef36349

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Benoît Marie Joseph Deveaud, Vincenzo Savona
2004
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/efe7a4f9-4164-4f21-919c-31590ef36349

About this result

Related concepts (21)

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.

Square root

In mathematics, a square root of a number x is a number y such that ; in other words, a number y whose square (the result of multiplying the number by itself, or ) is x. For example, 4 and −4 are square roots of 16 because . Every nonnegative real number x has a unique nonnegative square root, called the principal square root, which is denoted by where the symbol "" is called the radical sign or radix. For example, to express the fact that the principal square root of 9 is 3, we write .

Related publications (1)

Temperature dependence of the photoluminescence lifetime in disordered quantum wires

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