Carrier Transfer and capture into Quantum Wire Arrays Grown on V-Grooved Substrates (2008)
Haacke, S., Hartig, M., Deveaud, B., Oberli, D.Y., Kapon, E., Mrti, U., ...
Coulomb Correlation and Bandgap Renormalization at High Carrier Densities in Quantum Wires (2008)
Ambigapathy, R., Bar-Joseph, I., Oberli, D.Y., Haacke, S., Brasil, M.J., Reinhardt, F., ...
Hartig, M., Haacke, S., Deveaud, B., Rota, L.
We have investigated the intersubband scattering of electrons in GaAs quantum wells using luminescence up-conversion with 100-fs resolution. The decay time of the n=2 electron-to-heavy-hole...
Haddab, Y., Bonard, J. M., Haacke, S., Deveaud, B.
We have grown high-electron mobility transistor structures in the Al0.3Ga0.7As/In0.25Ga0.75As/GaAs material system with In0.25Ga0.75As channel thicknesses in the range 40-200 Angstrom. We have...
Carrier transfer and capture into quantum wire arrays grown on V-groove substrates (2007)
Haacke, S., Hartig, M., Oberli, D. Y., Deveaud, B., Kapon, E., Marti, U., ...
The mechanisms of carrier transfer from barrier regions (superlattices, side-wall and vertical quantum wells) into arrays of quantum wires are investigated by time-resolved photoluminescence. The...
Haacke, S., Hayes, G., Taylor, R. A., Deveaud, B., Zimmermann, R., BarJoseph, I.
We present a comparative study of time-integrated four-wave-mixing and femtosecond emission under resonant excitation on excitons in weakly disordered GaAs quantum wells. At highest exciton densities...
Efficient intersubband scattering via carrier-carrier interaction (2007)
Hartig, M., Haacke, S., Selbmann, P. E., Deveaud, B., Taylor, R. A., Rota, L.
Using femtosecond resonant luminescence, we have measured the intersubband scattering rate of electrons in wide GaAs quantum wells at very low excitation densities. Even when the spacing be tween the...
Direct observation in the temporal domain of relaxation oscillations in a semiconductor laser (2007)
Hessler, T., Haacke, S., Pleumeekers, J. L., Selbmann, P. E., Dupertuis, M. A., Deveaud, B., ...
Pump and Probe measurements with femtosecond pulses are performed on a Gain-Clamped Semiconductor Optical Amplifier (a special laser structure). The relaxation oscillations of the carriers density...
Hessler, T., Haacke, S., Pleumeekers, J. L., Selbmann, P. E., Dupertuis, M. A., Deveaud, B., ...
Pump and probe measurements with femtosecond resolution are performed on a gain-clamped semiconductor optical amplifier, a structure that contains a lasing mode. The corresponding relaxation...
Zimmermann, S., Vina, L., Schweizer, H., Scholz, F., Haacke, S., Deveaud, B.
The coexistence of localized and free holes in modulation doped InGaAs/InP quantum wells, which show Fermi edge singularities in the cw photoluminescence and excitation spectra, has been determined...
Coulomb correlation and band gap renormalization at high carrier densities in quantum wires (2007)
Ambigapathy, R., BarJoseph, I., Oberli, D. Y., Haacke, S., Brasil, M. J., Reinhardt, F., ...
We have studied the luminescence of narrow quantum wires at photoexcitation densities of up to similar to 3 x 10(6) cm(-1). We show that even at these densities, which are well above the expected...
Haacke, S., Taylor, R. A., Zimmermann, R., BarJoseph, I., Deveaud, B.
We study the ultrafast properties of secondary radiation of semiconductor quantum wells under resonant excitation. We show that the exciton density dependence allows one to identify the origin of...
Hartig, M., Haacke, S., Taylor, R. A., Rota, L., Deveaud, B.
Using luminescence upconversion with 100 fs resolution, we have investigated the intersubband scattering of electrons in GaAs quantum wells (QWs). The energy separations between the first and second...
Pleumeekers, J. L., Dupertuis, M. A., Hessler, T., Selbmann, P. E., Haacke, S., Deveaud, B.
The longitudinal spatial hole burning (LSHB) in gain-clamped semiconductor optical amplifiers (GCSOA's) is investigated by means of a numerical model, which is based on position-dependent rate...
Haacke, S., Taylor, R. A., Bar-Joseph, I., Brasil, Mjsp, Hartig, M., Deveaud, B.
We have improved the sensitivity and signal-to-noise ratio of a luminescence upconversion experiment, using a charge-coupled device (CCD) as the detector. We show experimentally and numerically that...
Dynamical density matrix theory of multiphoton transitions in semiconductors (2007)
Selbmann, P. E., Dupertuis, M. A., Haacke, S., Hessler, T., Pleumeekers, J. L., Deveaud, B.
A dynamical theory of multiphoton transitions in semiconductors is developed using a density matrix approach. It is shown that, in dipole approximation, these transitions require a mixed parity of...
Efficient intersubband scattering via carrier-carrier interaction in quantum wells (2007)
Hartig, M., Haacke, S., Selbmann, P. E., Deveaud, B., Taylor, R. A., Rota, L.
Using femtosecond resonant luminescence, we have measured the intersubband scattering fare of electrons in wide GaAs quantum wells at very low excitation densities. Even when the spacing between the...
Dynamics of charged excitons in GaAs quantum wells under high magnetic field (2007)
Ciulin, V., Finkelstein, G., Haacke, S., Ganiere, J. D., Umansky, V., Bar-Joseph, I., ...
We report on time-resolved photoluminescence studies of charged and neutral excitons in a modulation doped GaAs quantum well under resonant excitation and high magnetic field. The radiative lifetime...
Charged exciton dynamics in GaAs quantum wells (2007)
Finkelstein, G., Umansky, V., Bar-Joseph, I., Ciulin, V., Haacke, S., Ganiere, J. D., ...
We study the dynamics of the charged and neutral excitons in a modulation-doped GaAs quantum well by time-resolved photoluminescence under a resonant excitation. The radiative lifetime of the charged...
Resonant Rayleigh scattering versus incoherent luminescence in semiconductor microcavities (2007)
Hayes, G. R., Haacke, S., Kauer, M., Stanley, R. P., Houdre, R., Oesterle, U., ...
It is demonstrated that during the first few picoseconds after resonant femtosecond excitation the secondary radiation from a strongly coupled semiconductor microcavity containing one quantum well is...
Femtosecond dynamics of secondary radiation formation from quantum well excitons (2007)
Taylor, R. A., Haacke, S., Deveaud, B., Joseph, I. B., Zimmermann, R.
The time-resolved secondary emission of resonantly created excitons in GaAs quantum wells is studied using femtosecond up-conversion spectroscopy. The behaviour of the rise and decay of the secondary...
Carrier-carrier interaction and fast intersubband scattering in wide GaAs quantum wells (2007)
Rota, L., Hartig, M., Haacke, S., Selbmann, P. E., Deveaud, B.
Wide quantum wells, where the energy spacing between the first two energy levels is lower than the energy of the polar optical phonon, could represent the ideal condition to obtain a population...
Ciulin, V., Kossacki, P., Haacke, S., Ganiere, J. D., Deveaud, B., Esser, A., ...
Using reflectivity and picosecond time-resolved photoluminescence, we have studied the intrinsic optical properties of negatively charged excitons in modulation doped CdTe quantum wells. In emission,...
Theory of ultrafast Rayleigh scattering in semiconductor quantum wells (2007)
Savona, V., Runge, E., Zimmermann, R., Haacke, S., Deveaud, B.
The Rayleigh scattering of light at resonance with the ground state exciton transition in quantum wells is studied by means of a microscopic model. The disorder-induced localization of the exciton...
Speckle-averaged resonant Rayleigh scattering from quantum-well excitons (2007)
Hayes, G. R., Deveaud, B., Savona, V., Haacke, S.
We have measured the ultrafast resonant Rayleigh scattering from quantum-well excitons using Fourier-transform spectral interferometry. The experiment simultaneously measures a statistically...
Resonant Rayleigh scattering on quantum well excitons: Theory and experiment (2007)
Savona, V., Haacke, S., Deveaud, B.
Time-resolved up-conversion measurements of secondary emission from multiple quantum wells under resonant femtosecond excitation are reported for GaAs multiple quantum wells with qualitatively...
Radiative lifetime of negative trions in GaAs and CdTe quantum wells (2007)
Ciulin, V., Kossacki, P., Ganiere, J. D., Haacke, S., Deveaud, B., Moradi, A., ...
We have studied experimentally the radiative lifetimes of negatively charged excitons (X-) and neutral excitons (X) in GaAs and CdTe quantum wells. Despite the different optical properties (e.g....
Interferometric analysis of resonant Rayleigh scattering from two-dimensional excitons (2007)
Haacke, S., Schaer, S., Deveaud, B., Savona, V.
We have performed spectral interferometry with Rayleigh scattered light coming from a single speckle and emitted after resonant creation of excitons in GaAs quantum wells:: The experiment confirms...
Optical signatures of energy-level statistics in a disordered quantum system (2007)
Savona, V., Haacke, S., Deveaud, B.
Time-resolved measurements of the resonant Rayleigh scattering from quantum well excitons are shown to provide information on the energy-level statistics of the localized exciton states. The signal...
Negatively charged excitons in CdTe-based quantum wells: A time-resolved study (2007)
Ciulin, V., Kossacki, P., Haacke, S., Ganiere, J. D., Deveaud, B., Esser, A., ...
Using time-resolved photoluminescence, we have investigated the radiative behavior of neutral and negatively charged excitons in CdTe-based quantum wells. We find that the photoluminescence of...
Trions and excitons in CdTe quantum wells: Lifetimes, coherence, diffusion and localization (2007)
Portella-Oberli, M. T., Ciulin, V., Haacke, S., Ganiere, J. D., Kossacki, P., Kutrowski, M., ...
We present the results of a study of the dynamics of trions and excitons in a CdTe modulationdoped quantum well as a function of temperature in the low-density regime. Using three-pulse four-wave...
Diffusion, localization, and dephasing of trions and excitons in CdTe quantum wells (2007)
Portella-Oberli, M. T., Ciulin, V., Haacke, S., Ganiere, J. D., Kossacki, P., Kutrowski, M., ...
Excitons and trions in a CdTe modulation-doped quantum well are investigated by picosecond three-pulse four-wave mixing experiments as a function of temperature in the low-density regime. We show...
Portella-Oberli, M. T., Ciulin, V., Kossaki, P., Haacke, S., Kutrowski, M., Wojtowicz, T., ...
The dynamics of excitons and trions in CdTe modulation-doped quantum wells are studied as a function of temperature by three-pulse four-wave mixing experiments. It is shown that trions are localized...
Portuondo-Campa, E., Schenkl, S., Dolder, M., Chergui, M., Landau, E. M., Haacke, S.
A comparative study of absorption spectroscopy at 100 K has been performed on three-dimensional crystals of bacteriorhodopsin extd. from a lipidic cubic phase and on native purple membrane. A...
Schenkl, S., Van Mourik, F., Friedman, N., Sheves, M., Schlesinger, R., Haacke, S., ...
A visible-pump/UV-probe transient absorption is used to characterize the ultrafast dynamics of bacteriorhodopsin with 80-fs time resoln. We identify three spectral components in the 265- to 310-nm...
Haacke, S., Schenkl, S., Vinzani, S., Chergui, M.
The spectrally and temporally resolved fluorescence properties of native bacteriorhodopsin (bR) and bR reconstituted with a nonisomerizing analog of the retinal Schiff base (bR5.12) are examd. The...
Ultrafast energy relaxation in bacteriorhodopsin studied by time-integrated fluorescence (2006)
Schenkl, S., Portuondo, E., Zgrablic, G., Chergui, M., Haacke, S., Friedman, N., ...
Time-integrated fluorescence expts. on native bacteriorhodopsin and on its non-isomerizing form bR5.12 are reported. The exptl. set-up was designed such as to observe emission exclusively from the...
Zgrablic, G., Voitchovsky, K., Kindermann, M., Chergui, M., Haacke, S.
The ultrafast spectral evolution of the fluorescence of the all-trans protonated Schiff base of retinal (PSBR) in alcs. with different polarity was studied using the fluorescence up-conversion...
Probing the Ultrafast Charge Translocation of Photoexcited Retinal in Bacteriorhodopsin (2006)
Schenkl, S., Van Mourik, F., Van Der Zwan, G., Haacke, S., Chergui, M.
The ultrafast evolution of the elec. field within bacteriorhodopsin was measured by monitoring the absorption changes of a tryptophan residue after excitation of retinal. The Trp absorption decreases...
Bonati, C., Mohamed, M. B., Tonti, D., Zgrablic, G., Haacke, S., Van Mourik, F., ...
Femtosecond photoluminescence (PL) up-conversion studies in polychromatic mode and laser-power-dependence studies of the PL were carried out on colloidal solns. of CdSe quantum dots with diams....
Schenkl, S., Van Mourik, F., Friedman, N., Sheves, M., Schlesinger, R., Haacke, S., ...
This version is available at http://www.pnas.org, http://dx.doi.org/10.1073/pnas.0506303103
Vengris, M., Horst, M.A. Van Der, Zgrablic, G., Stokkum, I.H.M. Van, Haacke, S., Chergui, M., ...
Wavelength- and time-resolved fluorescence experiments have been performed on the photoactive yellow protein, the E46Q mutant, the hybrids of these proteins containing a nonisomerizing...
Time-Resolved Luminescence of Semiconductor Heterostructures in High Magnetic-Fields (1995)
Queisser, H.J., Weimann, G., Kohler, K., Maan, J.C., Ruhle, W.W., Potemski, M., ...
Time-resolved luminescence of semiconductor heterostructures in high magnetic field (1995)
Heberle, A.P., Haacke, S., Oestreich, M., Potemski, M., Rühle, W.W., Maan, J.C., ...
Direct observation of resonant tunneling dynamics in high magnetic fields (1994)
Heberle, A.P., Oestreich, M., Haacke, S., Rühle, W.W., Maan, J.C., Köhler, K.
Magnetotunneling of electrons in an asymmetric double quantum well is investigated by time-resolved luminescence spectroscopy. The tunneling time decreases strongly when the bottom of the lowest...
Coulomb Correlation and Bandgap Renormalization At High Carrier Densities in Quantum Wires (1970)
R. Ambigapathy, I. Bar-joseph, D. Y. Oberli, S. Haacke, M. J. Brasil, F. Reinhardt, ...
We have studied the luminescence of narrow quantum wires at photoexcitation densities of up to # 310 6 cm -1 . We show that, even at these densities, which are well above the expected Mott density of...
Schenkl, S., Van Mourik, F., Friedman, N., Sheves, M., Schlesinger, R., Haacke, S., ...
A visible-pump/UV-probe transient absorption is used to characterize the ultrafast dynamics of bacteriorhodopsin with 80-fs time resolution. We identify three spectral components in the 265- to...
Schenkl, S., Van Mourik, F., Friedman, N., Sheves, M., Schlesinger, R., Haacke, S., ...
A visible-pump/UV-probe transient absorption is used to characterize the ultrafast dynamics of bacteriorhodopsin with 80-fs time resolution. We identify three spectral components in the 265- to...