Publication

Interplay between superfluidity and magnetic self-trapping of exciton polaritons

Timothy Chi Hin Liew
2009
Journal Articles

Abstract

In dilute magnetic semiconductor microcavities, exciton polaritons self-localize in real space due to the magnetic polaron effect. The resulting circularly polarized classical condensates can be transformed into superfluids by increasing the temperature and applying an external magnetic field. The interplay between polariton-polariton repulsion and exchange coupling of polaritons with magnetic ions strongly affects the phase diagram for Bose-Einstein condensation of exciton polaritons.

Official source

https://infoscience.epfl.ch/entities/publication/4925c6de-e41a-44df-8182-b98662f29da7

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Timothy Chi Hin Liew
2009
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4925c6de-e41a-44df-8182-b98662f29da7

About this result

Related concepts (24)

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.

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.

Magnetic moment

In electromagnetism, the magnetic moment is the magnetic strength and orientation of a magnet or other object that produces a magnetic field. Examples of objects that have magnetic moments include loops of electric current (such as electromagnets), permanent magnets, elementary particles (such as electrons), composite particles (such as protons and neutrons), various molecules, and many astronomical objects (such as many planets, some moons, stars, etc).

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