Publication

Crossover from exciton to biexciton cavity polaritons

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

Abstract

We report novel oscillator strength transfer phenomena induced by the exciton-exciton correlation. A high quality semiconductor microcavity is resonantly excited by intense circularly polarised sigma(+) pump pulses (100 fs long) and probed at different delays by weak counter-polarised sigma(-) test pulses. We show that the presence of sigma(+) excitons can completely inhibit the creation of sigma(-) excitons. With increasing sigma(+) exciton density the oscillator strength of the a- transition is transferred to the biexciton transition, permitting the first observation of the strong coupling regime between the biexciton transition and the cavity photon mode, i.e., the biexciton polariton states.

Official source

https://infoscience.epfl.ch/entities/publication/1ba245c9-be8a-4f71-bd13-5e80ab1fda9f

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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/1ba245c9-be8a-4f71-bd13-5e80ab1fda9f

About this result

Related concepts (26)

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.

Electromagnetic pulse

An electromagnetic pulse (EMP), also referred to as a transient electromagnetic disturbance (TED), is a brief burst of electromagnetic energy. The origin of an EMP can be natural or artificial, and can occur as an electromagnetic field, as an electric field, as a magnetic field, or as a conducted electric current. The electromagnetic interference caused by an EMP can disrupt communications and damage electronic equipment. An EMP such as a lightning strike can physically damage objects such as buildings and aircraft.

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.