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Springer series in solid-state sciences

Spin Effects in Exciton–Polariton Condensates

Alexey Vitalievich Kavokin

Published Jan 1, 2012• 2 citations
Publisher
DOI
10.1007/978-3-642-24186-4_8

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We study theoretically the correlation properties of exciton-polaritons in planar microcavities under pulsed excitation. In particular, we analyze the quantum statistics of two pseudo-spin components of an exciton-polariton condensate in the course of its formation. Below the bosonic condensation threshold, the statistics of two components correspond to a chaotic thermal state, while above the threshold, the coherence is built up, and the photons emitted by different spin components of the condensate become anticorrelated. This spin antibunching effect can be evidenced by spin-resolved Hanbury-Brown and Twiss spectroscopy of polariton lasers.
Abstract A complete-nonequilibrium model is proposed to investigate spinor exciton-polariton condensates (SEPCs) in a magnetic field. Due to the Zeeman splitting (ZS), the loss rates of two spin components in a magnetic field are distinct and affected by the magnetic field. Therefore, the individual spin component of a SEPC has its own threshold pump power. We investigate the ZS and degree of circular polarization of the SEPC as a function of the excitation power and magnetic field. Above both spin-dependent threshold pump powers, we find an increasing degree of circular polarization with the magnetic field and a quenching of the ZS below a critical strength of the magnetic field. The ZS of a SEPC shows a reverse sign and its magnitude is increasing significantly compared to the uncondensed exciton-polartion ZS. The effect of a magnetic field on excitation spectra of SEPCs are also investigated. We find that the excitation dispersions are Bogoliubov excitations if the pump power is low. The nonequilibrium fluctuations in a SEPC are reduced when a magnetic field is applied.