Magnetic field effect on polarization and dispersion of exciton-polaritons in planar microcavities (original) (raw)
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Magnetic field tuning of exciton-polaritons in a semiconductor microcavity
Physical Review B, 2015
We detail the influence of a magnetic field on exciton-polaritons inside a semiconductor microcavity. Magnetic field can be used as a tuning parameter for exciton and photon resonances. We discuss the change of the exciton energy, the oscillator strength and redistribution of the polariton density along the dispersion curves due to the magnetically-induced detuning. We have observed that field-induced shrinkage of the exciton wave function has a direct influence not only on the exciton oscillator strength, which is observed to increase with the magnetic field, but also on the polariton linewidth. We discuss the effect of the Zeeman splitting on polaritons which magnitude changes with the exciton Hopfield coefficient and can be modelled by independent coupling of the two spin components of excitons with cavity photons.
Polarization rotation in parametric scattering of polaritons in semiconductor microcavities
Physical Review B, 2003
Polarization of light emitted by a semiconductor microcavity in the regime of a resonant parametric scattering of the exciton polaritons shows extremely strong and unusual dependence on the polarization of pumping light. This dependence is interpreted here using the pseudospin model and in the framework of a quasiclassical formalism where the parametric scattering is described as resonant four-wave mixing. We show that the optically induced splitting of the exciton-polariton eigenstate, both in linear and circular polarizations, is responsible for the observed polarization effects. The splitting in circular polarizations, achieving 0.5 meV, has been detected experimentally, while the splitting in linear polarizations, which is much weaker, only manifests itself in the pseudospin dynamics of the exciton polaritons.
Physical Review B, 1999
A comprehensive theoretical and experimental study of linear exciton-light coupling in single and coupled semiconductor microcavities is presented: emphasis is given to angular dispersion and polarization effects in the strong-coupling regime. The phase delay in the dielectric mirrors carries a nontrivial angle and polarization dependence. The polarization splitting of cavity modes increases with internal angle as sin 2 eff . Comparison with experimental results on a GaAs-based cavity with In 0.13 Ga 0.87 As QW's shows that a quantitative understanding of polariton dispersion and polarization splitting has been achieved. Coupling of two identical cavities through a central dielectric mirror induces an optical splitting between symmetric and antisymmetric modes. When QW excitons are embedded in both cavities at antinode positions, the system behaves as four coupled oscillators, leading to a splitting of otherwise degenerate exciton states and to separate anticrossing of symmetric and antisymmetric modes. These features are confirmed by experimental results on coupled GaAs cavities with In 0.06 Ga 0.94 As QW's. Finally, the polarization splitting in a coupled cavity is analyzed in detail and is in good agreement with the experimental findings. ͓S0163-1829͑99͒03407-4͔ PRB 59 5083 EXCITON-LIGHT COUPLING IN SINGLE AND . . .
Polarization beats in ballistic propagation of exciton-polaritons in microcavities
Physical Review B, 2007
The emission from a microcavity in the strong coupling regime excited resonantly by linearly polarized light has been measured with spatial, directional, and temporal resolution. We observe ballistic propagation of the excited polaritons as a ring spreading in real space. The linear polarization degree P of the emission at the ring is found to oscillate as a function of the azimuthal angle and of time t according to P = sin͑2͒sin͑⍀ LT t /2͒, where ⍀ LT is the longitudinal-transverse splitting of the exciton-polariton modes. This dependence holds for all investigated excitation energies corresponding to different values of ⍀ LT. The theoretical model assuming ballistic propagation of exciton polaritons in the specific cavity structure yields a detailed agreement with the experimental data. The observed polarization beats have the same nature as the recently predicted optical spin Hall effect.
Two dimensional exciton polaritons in microcavities with embedded quantum wires
Superlattices and Microstructures, 1998
Optical anisotropy of the periodical array of quantum wires embedded in a semiconductor microcavity is shown to result in polarization-dependent vacuum-field Rabi-splitting and a triple-anticrossing shape of the exciton-polariton dispersion curves. Both effects originate from the resonant diffraction of light at the grating of quantum wires. The calculation has been done within the nonlocal dielectric response theory and using the 4 × 4 transfer matrix technique.
Polarisation rotation in resonant emission of semiconductor microcavities
physica status solidi (a), 2003
We present the semi-classical theory of the non-linear propagation of polarized light in semiconductor microcavities. This formalism explains the mysterious rotation of the polarization plane of light emitted by a microcavity in the regime of stimulated scattering observed recently. The model describes the stimulated four-wave mixing in microcavities. We show that the exciton spin-splitting induced by the polarized pumping is responsible for giant resonant Faraday rotation of the polarization plane of light emitted by the cavity.
Polarization dependence of nonlinear wave mixing of spinor polaritons in semiconductor microcavities
Physical Review B, 2016
The pseudo-spin dynamics of propagating exciton-polaritons in semiconductor microcavities are known to be strongly influenced by TE-TM splitting. As a vivid consequence, in the Rayleigh scattering regime, the TE-TM splitting gives rise to the optical spin Hall effect (OSHE). Much less is known about its role in the nonlinear optical regime in which four-wave mixing for example allows the formation of spatial patterns in the polariton density, such that hexagons and two-spot patterns are observable in the far field. Here we present a detailed analysis of spin-dependent fourwave mixing processes, by combining the (linear) physics of TE-TM splitting with spin-dependent nonlinear processes, i.e., exciton-exciton interaction and fermionic phase-space filling. Our combined theoretical and experimental study elucidates the complex physics of the four-wave mixing processes that govern polarization and orientation of off-axis modes.
Exciton-polaritons in microcavities: Recent discoveries and perspectives
physica status solidi (b), 2010
The exciton-polaritons in microcavities is a unique bosonic system which demonstrates remarkable quantum coherent phenomena at very high temperatures. The Bose-Einstein condensation (BEC) and superfluidity, polariton lasing, parametric scattering and amplification, polariton spin switching, optical spin Hall effect (OSHE), quantised vortices are among the fascinating phenomena discovered in microcavities in the XXIst century. This paper is a short review of these and other recent discoveries in the exciton-polariton physics. It also contains an attempt to predict the next steps in the development of this field and addresses several effects, which have been theoretically predicted but not yet experimentally observed. This includes the 'polariton neurons', the 'spin Meissner effect' and the exciton-polariton mediated superconductivity.
Diamagnetism of microcavity polaritons induced by spin-dependent polariton–polariton interactions
Physics Letters A, 2012
Diamagnetism of condensed microcavity polaritons in a vertically applied magnetic field is theoretically studied by using the density of free energy of polaritons. The magnetic dependence of polariton-polariton interactions and spin polarization degree of polaritons are derived, and are used to show the diamagnetic behavior of the polariton spin polarization, which is discussed for GaAs-based microcavities. We show that for strong magnetic field the spin polarization of the polaritons is paramagnetic as usual, while around positive exciton-photon detuning and special Rabi splitting, the spin polarization of the polaritons could be diamagnetic. In addition, weak magnetic field and high polariton density are beneficial to observe the polariton diamagnetism.
Exciton polaritons in single and coupled microcavities
Journal of Luminescence, 2000
Recent work on strong coupling exciton}polariton phenomena in single and coupled microcavities is presented. We describe experiments for single cavities where the strong coupling nature of the excitations manifests itself. It is also shown that coupled cavities enable optically induced coupling between macroscopically separated exciton states to be achieved, and polaritons with strongly anisotropic properties to be realised. Results for both inorganic and organic microcavities are presented.