6533b85cfe1ef96bd12bca78
RESEARCH PRODUCT
Ultrafast non-linear optical signal from a single quantum dot: exciton and biexciton effects
A. ReyesF.j. RodríguezLuis Quirogasubject
PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsStrongly Correlated Electrons (cond-mat.str-el)ExcitonTime evolutionFOS: Physical sciencesCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsPolarization (waves)Molecular physicsCondensed Matter - Strongly Correlated ElectronsFour-wave mixingQuantum dotMesoscale and Nanoscale Physics (cond-mat.mes-hall)Bound stateGeneral Materials ScienceUltrashort pulseBiexcitondescription
We present results on both the intensity and phase-dynamics of the transient non-linear optical response of a single quantum dot (SQD). The time evolution of the Four Wave Mixing (FWM) signal on a subpicosecond time scale is dominated by biexciton effects. In particular, for the cross-polarized excitation case a biexciton bound state is found. In this latter case, mean-field results are shown to give a poor description of the non-linear optical signal at small times. By properly treating exciton-exciton effects in a SQD, coherent oscillations in the FWM signal are clearly demonstrated. These oscillations, with a period corresponding to the inverse of the biexciton binding energy, are correlated with the phase dynamics of the system's polarization giving clear signatures of non-Markovian effects in the ultrafast regime.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-08-29 | Journal of Physics: Condensed Matter |