[PDF] Top 20 Off branch polaritons and multiple scattering in semiconductor microcavities

... a semiconductor microcavity excited in this polariton parametric amplification ...switched off. Their energy is found to be off the normal polariton branches, and their dispersions are also ... See full document

... The scattering maximum at DE' 7 meV cannot be ex- plained by a single acoustic phonon process since the maxi- mum energy transferred is ; 1 meV; 4,5 multiphonon pro- cesses are also very unlikely due to the fast ... See full document

... lower branch polaritons, which would otherwise ob- scure the Raman signals was quenched by applying electric fields up to 30 kV/cm to sweep out photocreated electron- hole ...Raman scattering is a ... See full document

... By adjusting the thickness of the oxide spacer layer and thus the cavity resonance, we could readily tune the polariton emission across a wide spectral range. Using LEFETs with identical monochiral films of (6,5) ... See full document

... a semiconductor heterostruc- ture, for resonant third-order parametric interaction of two pump photons at v to produce the signal and idler emission ( v 6 e ) ...little scattering can occur between such ... See full document

... It is instructive to compare the angular size of the gain and idler beams with incoming pump and probe angular beamwidths. Both gain and idler beams have the same angu- lar width indicating that the momentum broadening ... See full document

... of polaritons out of the trap, which needs much higher energy excitons ...the scattering-in process initially creates such high-energy excitons, they rapidly re-thermalize, and occupation of these high-k ... See full document

... polariton branch (UPB) dispersions, together with the schematic representation of the optical parametric oscillator ...stimulated scattering to a signal close to zero momentum and an idler at higher ... See full document

... case polaritons are directly injected by the resonant laser beam into the system rather than spontaneously forming due to polariton relaxation from higher energy ...parametric scattering for resonant exci- ... See full document

... phonon scattering was predicted 2 and observed in angle-resolved ...Stimulated scattering due to the bosonic nature of polaritons has been demonstrated 4 in pump-probe ...polariton scattering ... See full document

... polariton branch particles to decay radiatively without further significant depolarisation, and with higher retention of valley ...fractions, scattering from the reservoir into these polariton branches is ... See full document

... polariton–polariton scattering in semiconductor microcavities under continuous wave excitation conditions is ...polariton–polariton scattering as the laser intensity is ...excitation, ... See full document

... symmetric. Polaritons which scatter down from the injected pump energy, are immediately emitted before they have a chance to ther- malise and lose the memory of the original direction of their in-plane ...from ... See full document

... by scattering polaritons from the pump state to populate the soliton ...polariton scattering is approximately given by h= ð gN Þ , where g is the interaction constant and N is the density (then gN is ... See full document

... polariton branch exhibits a dispersion which is photon-like at small wave vector and exciton-like at large wave vector, with a point of inflection in the dispersion between these two extremes, as shown in ... See full document

... in semiconductor microcavities [1], a large number of studies have been performed to understand the novel optical properties of such ...of microcavities in the ...of polaritons, stimulated ... See full document

... polariton branch exhibits a dispersion that is photon-like at small wavevector and exci- ton-like at large wavevector, with a point of inflection in the dispersion between these two extremes, as shown in Fig- ure ... See full document

... In order to investigate time scales longer than the tem- poral separation between two pulses, we use an electro- optical modulator to gate the non-resonant pump beam. The gate operates at a repetition rate of 100 kHz and ... See full document

... and polaritons accumulate in a broad bottleneck ...polariton scattering processes ...pair scattering processes between polaritons has been shown under pulsed excitation [5, 9], cw excitation ... See full document

... nonlinear increases of the low k population with excitation were observed [7,13,14], a smoothly varying distribution with k was found. We show here that strong stimulation occurs for resonant excitation close to the ... See full document