Radiative cascades in charged quantum dots (2009)
Poem, E., Kodriano, Y., Tradonsky, C., Gershoni, D., Gerardot, B. D., Petroff, P. M.
We measured, for the first time, two photon radiative cascades due to sequential recombination of quantum dot confined electron hole pairs in the presence of an additional spectator charge carrier....
Polarization memory in single Quantum Dots (2009)
Poem, E., Khatsevich, S., Benny, Y., Marderfeld, I., Badolato, A., Petroff, P. M., ...
We measured the polarization memory of excitonic and biexcitonic optical transitions from single quantum dots at either positive, negative or neutral charge states. Positive, negative and no circular...
Externally mode-matched cavity quantum electrodynamics with charge-tunable quantum dots (2009)
Rakher, M. T., Stoltz, N. G., Coldren, L. A., Petroff, P. M., Bouwmeester, D.
We present coherent reflection spectroscopy on a charge and DC Stark tunable quantum dot embedded in a high-quality and externally mode-matched microcavity. The addition of an exciton to a...
A semiconductor exciton memory cell based on a single quantum nanostructure (2008)
Krenner, H. J., Pryor, C. E., He, J., Petroff, P. M.
We demonstrate storage of excitons in a single nanostructure, a self-assembled Quantum Post. After generation electron and holes forming the exciton are separated by an electric field towards...
Dressed excitonic states and quantum interference in a three-level quantum dot ladder system (2008)
Gerardot, B. D., Brunner, D., Dalgarno, P. A., Karrai, K., Badolato, A., Petroff, P. M., ...
We observe dressed states and quantum interference effects in a strongly driven three-level quantum dot ladder system. The effect of a strong coupling field on one dipole transition is measured by a...
Dalgarno, P. A., Smith, J. M., McFarlane, J., Gerardot, B. D., Karrai, K., Badolato, A., ...
We present results on the charge dependence of the radiative recombination lifetime, Tau, and the emission energy of excitons confined to single self-assembled InGaAs quantum dots. There are...
Moskalenko, Evgenii, Larsson, Andréas, Larsson, Mats, Holtz, Per-Olof, Schoenfeld, W. V., Petroff, P. M.
A microphotoluminescence study of single InAs/GaAs quantum dots (QDs) in the presence of an applied external magnetic field is presented. Attention is focused on the redistribution between the...
Growth and optical properties of self-assembled InGaAs Quantum Posts (2007)
Krenner, H. J., Pryor, C., He, J., Zhang, J. P., Wu, Y., Morris, C. M., ...
We demonstrate a method to grow height controlled, dislocation-free InGaAs quantum posts (QPs) on GaAs by molecular beam epitaxy (MBE) which is confirmed by structural investigations. The optical...
Polarization sensitive spectroscopy of charged Quantum Dots (2007)
Poem, E., Shemesh, J., Marderfeld, I., Galushko, D., Akopian, N., Gershoni, D., ...
We present an experimental and theoretical study of the polarized photoluminescence spectrum of single semiconductor quantum dots in various charge states. We compare our high resolution polarization...
Contrast in transmission spectroscopy of a single quantum dot (2007)
Gerardot, B. D., Seidl, S., Dalgarno, P. A., Kroner, M., Karrai, K., Badolato, A., ...
We perform transmission spectroscopy on single quantum dots and examine the effects of a resident carriers spin, the incident laser spot size, polarization, and power on the experimental contrast. We...
Manipulating exciton fine-structure in quantum dots with a lateral electric field (2006)
Gerardot, B. D., Seidl, S., Dalgarno, P. A., Warburton, R. J., Granados, D., Garcia, J. M., ...
The fine structure of the neutral exciton in a single self assembled InGaAs quantum dot is investigated under the effect of a lateral electric field. Stark shifts up to 1.5 meV, an increase in...
Magnetic field effects on optical and transport properties in InAs/GaAs quantum dots (2006)
Larsson, Mats, Moskalenko, Evgenii, Larsson, Andréas, Holtz, Per-Olof, Verdozzi, C., ...
A photoluminescence study of self-assembled InAs/GaAs quantum dots under the influence of magnetic fields perpendicular and parallel to the dot layer is presented. At low temperatures, the magnetic...
Moskalenko, Evgenii, Larsson, Mats, Holtz, Per-Olof, Schoenfeld, W. V., Petroff, P. M.
A microphotoluminescence study of single InAs/GaAs quantum dots subjected to a lateral external electric field gives insight into carrier transport and capture processes into Stranski-Krastanov-grown...
Entangled Photon Pairs from Semiconductor Quantum Dots (2005)
Akopian, N., Lindner, N. H., Poem, E., Berlatzky, Y., Avron, J., Gershoni, D., ...
Tomographic analysis demonstrates that the polarization state of pairs of photons emitted from a biexciton decay cascade becomes entangled when spectral filtering is applied. The measured density...
Self-tuned quantum dot gain in photonic crystal lasers (2005)
Strauf, S., Hennessy, K., Rakher, M. T., Badolato, A., Andreani, L. C., ...
We demonstrate that very few (1 to 3) quantum dots as a gain medium are sufficient to realize a photonic crystal laser based on a high-quality nanocavity. Photon correlation measurements show a...
Emission characteristics of quantum dots in planar microcavities (2005)
Ramon, G., Mizrahi, U., Akopian, N., Braitbart, S., Gershoni, D., Reinecke, T. L., ...
The emission properties of single quantum dots in planar microcavities are studied experimentally and theoretically. Fivefold Enhanced spontaneous emission outside the microcavity is found for dots...
Seidl, S., Kroner, M., Dalgarno, P. A., Högele, A., Smith, J. M., Ediger, M., ...
We have performed detailed photoluminescence (PL) and absorption spectroscopy on the same single self-assembled quantum dot in a charge-tunable device. The transition from neutral to charged exciton...
Absorptive and dispersive optical responses of excitons in a single quantum dot (2005)
Alén, B., Högele, A., Kroner, M., Seidl, S., Karrai, K., Warburton, R. J., ...
We have determined both the real and imaginary parts of the dielectric polarizability of a single quantum dot. The experiment is based on the observation and the manipulation of Rayleigh scattering...
Giant optical anisotropy in a single InAs quantum dot in a very dilute quantum-dot ensemble (2004)
Favero, I., Cassabois, Guillaume, Jankovic, A., Ferreira, R., Darson, D., Voisin, C., ...
We present the experimental evidence of giant optical anisotropy in single InAs quantum dots. Polarization-resolved photoluminescence spectroscopy reveals a linear polarization ratio with huge...
Voltage-controlled electron-hole interaction in a single quantum dot (2004)
Högele, A., Seidl, S., Kroner, M., Karrai, K., Atatüre, M., Dreiser, J., ...
The ground state of neutral and negatively charged excitons confined to a single self-assembled InGaAs quantum dot is probed in a direct absorption experiment by high resolution laser spectroscopy....
Spin-selective optical absorption of singly charged excitons in a quantum dot (2004)
Högele, A., Kroner, M., Seidl, S., Karrai, K., Atatüre, M., Dreiser, J., ...
We investigate high resolution laser absorption spectroscopy of a single InGaAs/GaAs self-assembled quantum dot embedded in a field-effect structure. We show experimentally that the interband optical...
Voltage-Controlled Optics of a Quantum Dot (2004)
Högele, A., Seidl, S., Kroner, M., Karrai, K., Warburton, R. J., Gerardot, B. D., ...
We show how the optical properties of a single semiconductor quantum dot can be controlled with a small dc voltage applied to a gate electrode. We find that the transmission spectrum of the neutral...
GaN quantum dot density control by rf-plasma molecular beam epitaxy (2004)
Brown, J, Wu, F, Petroff, P M, Speck, J S
We report on the growth of GaN quantum dots and the control of their density in the Stranski-Krastanov mode on AlN (0001) by rf-plasma molecular beam epitaxy at 750 degreesC. After depositing the...
Fabrication of high Q square-lattice photonic crystal microcavities (2003)
Hennessy, K, Reese, C, Badolato, A, Wang, C F, Imamoglu, A, Petroff, P M, ...
This work discusses the fabrication of two-dimensional photonic crystal microcavities (PCMs) in a thin GaAs membrane. We have developed a fabrication process for square-lattice, single-hole-defect...
Voltage control of nuclear spin in ferromagnetic Schottky diodes (2003)
Epstein, R. J., Stephens, J., Hanson, M., Chye, Y., Gossard, A. C., Petroff, P. M., ...
We employ optical pump-probe spectroscopy to investigate the voltage dependence of spontaneous electron and nuclear spin polarizations in hybrid MnAs/n-GaAs and Fe/n-GaAs Schottky diodes. Through the...
Magneto-optical properties of charged excitons in quantum dots (2002)
Govorov, A. O., Schulhauser, C., Haft, D., Kalameitsev, A. V., Chaplik, A., Warburton, R. J., ...
We present both experimental and theoretical results on the influence of a magnetic field on excitons in semiconductor quantum dots. We find a pronounced difference between the strong and weak...
Spontaneous Spin Coherence in n-GaAs Produced by Ferromagnetic Proximity Polarization (2002)
Epstein, R. J., Malajovich, I., Kawakami, R. K., Chye, Y., Hanson, M., Petroff, P. M., ...
We find that photoexcited electrons in an n-GaAs epilayer rapidly (< 50 ps) spin-polarize due to the proximity of an epitaxial ferromagnetic metal. Comparison between MnAs/GaAs and Fe/GaAs structures...
Transport signatures of correlated disorder in a two-dimensional electron gas (2001)
Heinzel, T., Jaeggi, R. D., Ribeiro, E., Waldkirch, M. V., Ensslin, K., Ulloa, S. E., ...
We report electronic transport measurements on two-dimensional electron gases in a Ga[Al]As heterostructure with an embedded layer of InAs self-assembled quantum dots. At high InAs dot densities,...
Photoluminescence of a single InAs quantum dot molecule under applied electric field (2001)
Shtrichman, I., Metzner, C., Gerardot, B. D., Schoenfeld, W. V., Petroff, P. M.
We study the electronic coupling between two vertically stacked InAs quantum dots, which are embedded in the center of a n-i-n structure. We use a micro-photoluminescence setup to optically isolate a...
Photon Correlation Spectroscopy of a Single Quantum Dot (2001)
Kiraz, A., Falth, S., Becher, C., Gayral, B., Schoenfeld, W. V., Petroff, P. M., ...
We report photon correlation measurements that allow us to observe unique signatures of biexcitons in a single self-assembled InAs quantum dot. Photon correlation measurements of biexciton emission...
Regelman, D. V., Mizrahi, U., Gershoni, D., Ehrenfreund, E., Schoenfeld, W. V., Petroff, P. M.
We investigate the intensity correlation properties of single photons emitted from an optically excited single semiconductor quantum dot. The second order temporal coherence function of the photons...
Regelman, D. V., Dekel, E., Gershoni, D., Ehrenfreund, E., Williamson, A. J., Shumway, J., ...
We report on the observation of photoluminescence from positive, neutral and negative charge states of single semiconductor quantum dots. For this purpose we designed a structure enabling optical...
Regelman, D. V., Dekel, E., Gershoni, D., Ehrenfreund, E., Schoenfeld, W. V., Petroff, P. M.
We study optically single self-assembled quantum dots embedded within the wide quantum well of a mixed type quantum structure. We compare the steady state and pulsed photoluminescence spectra of...
Dekel, E., Regelman, D. V., Gershoni, D., Ehrenfreund, E., Schoenfeld, W. V., Petroff, P. M.
Using time correlated single photon counting combined with temperature dependent diffraction limited confocal photoluminescence spectroscopy we accurately determine, for the first time, the intrinsic...
Ribeiro,E., Jäggi,R., Heinzel,T., Ensslin,K., Medeiros-Ribeiro,G., Petroff,P. M.
We report the observation of a metal-insulator transition in zero magnetic eld in a two dimensional electron gas under the influence of a plane of InAs self-assembled quantum dots located at 30 Å...
Spectroscopy of nanoscopic semiconductor rings (1999)
Lorke, A., Luyken, R. J., Govorov, A. O., Kotthaus, J. P., Garcia, J. M., Petroff, P. M.
Making use of self-assembly techniques, we demonstrate the realization of nanoscopic semiconductor quantum rings in which the electronic states are in the true quantum limit. We employ two...
Carrier-Carrier Correlations in an Optically Excited Single Semiconductor Quantum Dot (1999)
Dekel, E., Gershoni, D., Ehrenfreund, E., Garcia, J. M., Petroff, P. M.
We applied low temperature diffraction limited confocal optical microscopy to spatially resolve, and spectroscopically study photoluminescence from single self-assembled semiconductor quantum dots....
Quantum Well Wires and Boxes Superstructures: Microprocessing and Characterization. (1998)
The research was aimed at producing quantum wire superlattices with dimensions below 10nm by directly using molecular beam epitaxy. Two(2D) and three dimensional (3D) carrier confinement is...
Research on Self-Assembling Quantum Dots. (1998)
We summarize the studies done under this contract by listing the main accomplishments in the last 6 years. We started this research by fabricating arrays of antidots in a modulation doped FET...
Ribeiro, E., Jaeggi, R., Heinzel, T., Ensslin, K., Medeiros-Ribeiro, G., Petroff, P. M.
A metal-insulator transition in two-dimensional electron gases at B=0 is found in Ga(Al)As heterostructures, where a high density of self-assembled InAs quantum dots is incorporated just 3 nm below...
Multi-Exciton Spectroscopy of a Single Self Assembled Quantum Dot (1998)
Dekel, E., Gershoni, D., Ehrenfreund, E., Petroff, P. M.
We apply low temperature confocal optical microscopy to spatially resolve, and spectroscopically study a single self assembled quantum dot. By comparing the emission spectra obtained at various...
Anomalous magnetophotoluminescence as a result of level repulsion in arrays of quantum dots (1997)
Tsiper, E. V., Wang, P. D., Merz, J. L., Efros, A. L., Fafard, S., Leonard, D., ...
Selectively excited photoluminescence (SPL) of an array of self-organized In$_{0.5}$Ga$_{0.5}$As quantum dots has been measured in a magnetic field up to 11T. Anomalous magnetic field sensitivity of...
Far-infrared and capacitance spectroscopy of self-assembled InAs quantum dots (1996)
Lorke, A., Fricke, M., Miller, B. T., Haslinger, M., Kotthaus, J. P., Medeiros-Ribeiro, G., ...
We review a number of recent experiments which are probing ground state and excitations of few-electron systems in self-assembled InAs quantum dots. Far-infrared spectroscopy, together with local as...
Single-electron charging of self-assembled InAs quantum dots (1996)
Fricke, M., Lorke, A., Haslinger, M., Kotthaus, J. P., Medeiros-Ribeiro, G., Petroff, P. M.
The many-particle ground state and excitations of self-assembled InAs quantum dots are investigated using far-infrared (FIR) and capacitance spectroscopy. The contributions of quantization and...
Shell structure and electron-electron interaction in self-assembled InAs quantum dots (1996)
Fricke, M., Lorke, A., Kotthaus, J. P., Medeiros-Ribeiro, G., Petroff, P. M.
Using far-infrared spectroscopy, we investigate the excitations of self-organized InAs quantum dots as a function of the electron number per dot, 1
Single-Electron Charging and Coulomb Interaction in InAs Self-Assembled Quantum Dot Arrays (1996)
Medeiros-Ribeiro, G., Pikus, F. G., Petroff, P. M., Efros, A. L.
Sequential single-electron charging is observed in InAs Self-Assembled Quantum Dots using capacitance spectroscopy. In this system, the Coulomb energy is smaller than the inter-level energy spacings...