Photoacoustic Assessment Of The In Vivo Genotypical Response Of Corn To Toxic Aluminium

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)[No abstract available]1153341343ACRL; Association of College and Research Libraries; CAPES; Association of College and Research LibrariesCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Ingaas/inp Quantum Wells With Thickness Modulation

We investigated the optical properties of lattice-matched InGaAs/InP quantum wells grown by metalorganic molecular beam epitaxy on top of patterned InP buffer layers with elongated features along the [01̄1] direction. The resulting quantum wells present a periodic thickness variation following the elongated features. Low temperature luminescence measurements exhibit double emission bands, attributed to distinct regions of the well. Temperature evolution of the photoluminescence spectra gives qualitative information about the effect of exciton localization.65785785

Effect of magnetic confinement on manybody nonlinearities of Lorentzian excitons

100-fs time- and frequency-resolved four-wave mixing in GaAs at T=1.6K under magnetic field, 0{<=}|{rvec B}|{<=}12T, is used for investigating how magnetic confinement modifies the processes that govern the manybody nonlinearities of the Lorentzian excitons

Study Of Temperature-dependent Exciton Dynamics In A Single Quantum Well With Self-assembled Islands

We present an investigation of the exciton dynamics in a single quantum well with self-assembled islands. We combine continuous-wave and time-resolved luminescence measurements as a function of the temperature to obtain quantitative information on the recombination processes in the well. The obtained radiative recombination times indicate that excitons are localized at low temperatures. We also discuss the evidences of inter-island transferring of excitons.361-362810813Kohl, M., Heitmann, D., Tarucha, S., Leo, K., Ploog, K., (1989) Phys. Rev. B, 39, p. 7736Brasil, M.J.S.P., Nahory, R.E., Tamargo, M.C., Schwarz, S.A., (1993) Appl. Phys. Lett., 63, p. 2688Shah, J., (1988) IEEE J. Quantum Electron., 24, p. 726Deveaud, B., Damen, T.C., Shah, J., Tu, C.W., (1987) Appl. Phys. Lett., 51, p. 828Feldmann, J., Peter, G., Göbel, E.O., Dawson, P., Moore, K., Foxon, C., Elliott, R.J., (1987) Phys. Rev. Lett., 59, p. 2337Gurioli, M., Vinattieri, A., Colocci, M., Deparis, C., Massies, J., Neu, G., Bosacchi, A., Franchi, S., (1991) Phys. Rev. B, 44, p. 3115Klann, R., Grahn, H.T., Fujiwara, K., (1995) Phys. Rev. B, 51, p. 1023

Effect Of Magnetoexciton Correlations On The Coherent Emission Of Semiconductors

Mean-field, Hartree-Fock theory has been successful in explaining many nonlinear optical experiments in semiconductors. But recently experiments have shown important cases where the mean-field theory (the semiconductor Bloch equations) fails. One such case is bulk GaAs in a strong magnetic field. Here the exciton-exciton interaction can be tuned by varying the magnetic field, providing an excellent method for studying the transition from a regime where mean-field theory is valid to a regime where exciton-exciton correlations must be taken into account. We perform ultrafast time-resolved four-wave mixing on bulk GaAs in a magnetic field, and compare our experimental results with theoretical calculations which go beyond Hartree-Fock theory. We find excellent qualitative agreement. Furthermore, because of the strong correlations that are present, GaAs in a magnetic field presents an excellent opportunity to study the exciton-exciton correlations themselves. 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