Publication

One-dimensional biexcitons in a single quantum wire

Benoît Marie Joseph Deveaud, Jean-Louis Staehli, Andrea Crottini
2002
Journal Articles

Abstract

We report the direct observation of one-dimensional (ID) excitonic molecules (biexcitons) in high quality disorder free semiconductor quantum wires. By means of spatially resolved near-field photoluminescence spectroscopy, we detected delocalized 1D excitons through the spatial extension of their homogeneous emission. 1D biexciton transitions are evidenced by their correlation to the 1D excitons as well as their power dependence. The photoluminescence intensity from biexcitons is shown to increase quadratically compared to the linear variation for excitonic emission, in agreement with the mass action law. The biexciton binding energy is measured to be 1.2 meV, and the lineshape is clearly asymmetric, showing the expected low energy tail. (C) 2002 Elsevier Science Ltd. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/c96f7aaf-373a-45a3-9c87-70ec490af283

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Benoît Marie Joseph Deveaud, Jean-Louis Staehli, Andrea Crottini
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c96f7aaf-373a-45a3-9c87-70ec490af283

About this result

Related concepts (30)

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.

Dimension

In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it. Thus, a line has a dimension of one (1D) because only one coordinate is needed to specify a point on it - for example, the point at 5 on a number line. A surface, such as the boundary of a cylinder or sphere, has a dimension of two (2D) because two coordinates are needed to specify a point on it - for example, both a latitude and longitude are required to locate a point on the surface of a sphere.

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.

Related publications (1)

One-dimensional biexcitons in a single quantum wire

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Ultrafast coherent control of excitons and exciton-polaritons in quantum nanostructure