Publication

Crossover from exciton to biexciton polaritons in semiconductor microcavities

Benoît Marie Joseph Deveaud, Ursula Oesterle, Jean-Louis Staehli, Cristiano Ciuti, Michele Saba
2000
Journal Articles

Abstract

Pump-probe measurements in a microcavity containing a quantum well show that a population of circularly polarized (sigma(+)) excitons can completely inhibit the transition to sigma(-) one-exciton states by transferring the oscillator strength to the biexcitonic resonance. With increasing pump intensity the linear exciton-polariton doublet evolves into a triplet polariton structure and finally into a shifted biexciton-polariton doublet. A theoretical model of interacting excitons demonstrates that the crossover from exciton to biexciton polaritons is driven by three-exciton Coulomb correlation.

Official source

https://infoscience.epfl.ch/entities/publication/d3c99406-dc21-43b2-8b69-a20541e7cb7e

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Benoît Marie Joseph Deveaud, Ursula Oesterle, Jean-Louis Staehli, Cristiano Ciuti, Michele Saba
2000
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/d3c99406-dc21-43b2-8b69-a20541e7cb7e

About this result

Related concepts (13)

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.

Circular polarization

In electrodynamics, circular polarization of an electromagnetic wave is a polarization state in which, at each point, the electromagnetic field of the wave has a constant magnitude and is rotating at a constant rate in a plane perpendicular to the direction of the wave. In electrodynamics, the strength and direction of an electric field is defined by its electric field vector. In the case of a circularly polarized wave, the tip of the electric field vector, at a given point in space, relates to the phase of the light as it travels through time and space.

Polariton

In physics, polaritons pəˈlærᵻtɒnz,_poʊ- are quasiparticles resulting from strong coupling of electromagnetic waves with an electric or magnetic dipole-carrying excitation. They are an expression of the common quantum phenomenon known as level repulsion, also known as the avoided crossing principle. Polaritons describe the crossing of the dispersion of light with any interacting resonance. To this extent polaritons can also be thought of as the new normal modes of a given material or structure arising from the strong coupling of the bare modes, which are the photon and the dipolar oscillation.

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Crossover from exciton to biexciton polaritons in semiconductor microcavities

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