Kaindl, R. A., Haegele, D., Carnahan, M. A., Chemla, D. S.
We report a comprehensive experimental study and detailed model analysis of the terahertz (THz) dielectric response and density kinetics of excitons and unbound electron-hole pairs in GaAs quantum...
Observation of inter-Landau-level quantum coherence in semiconductor quantum wells (2008)
Dani, K. M., Cotoros, I. A., Wang, J., Tignon, J., Chemla, D. S., Kavousanaki, E. G., ...
Using three-pulse four-wave-mixing femtosecond spectroscopy, we excite a non-radiative coherence between the discrete Landau levels of an undoped quantum well and study its dynamics. We observe...
Wang, J., Cotoros, I., Liu, X., Chovan, J., Furdyna, J. K., Perakis, I. E., ...
We report a femtosecond response in photoinduced magnetization rotation in the ferromagnetic semiconductor GaMnAs, which allows for detection of a four-state magnetic memory at the femtosecond time...
Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes in GaMnAs (2007)
Wang, J., Cotoros, I., Dani, K. M., Chemla, D. S., Liu, X., Furdyna, J. K.
We report on the observation of ultrafast photo-enhanced ferromagnetism in GaMnAs. It is manifested as a transient magnetization increase on a 100-ps time scale, after an initial sub-ps...
Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes in GaMnAs (2007)
Wang, J., Cotoros, I., Dani, K.M., Liu, X., Furdyna, J.K., Chemla, D.S.
Kaindl, Robert A., Carnahan, Marc A., Hagele, Daniel, Chemla, D.S.
Excitons are of fundamental interest and of importance for opto-electronic applications of bulk and nano-structured semiconductors. This paper discusses the utilization of ultrafast terahertz (THz)...
New Strategic Plan Takes the ALS into the Future (2006)
Kirz, J., Chemla, D.S., Feinberg, B., Hussain, Z., Krebs, G.F., Padmore, H.A., ...
A new strategic plan is in place to upgrade the ALS so it can continue to address fundamental questions, such as size-dependent and dimensional-confinement phenomena at the nanoscale; correlation and...
Ultrafast dynamics of coherences in the quantum Hall system (2006)
Dani, K. M., Tignon, J., Breit, M., Chemla, D. S., Kavousanaki, E. G., Perakis, I. E.
Using three-pulse four-wave-mixing optical spectroscopy, we study the ultrafast dynamics of the quantum Hall system. We observe striking differences as compared to an undoped system, where the 2D...
Nonlinear Optical studies of the Transient Coherence in the Quantum Hall System (2006)
Dani, K. M., Kavousanaki, E. G., Tignon, J., Chemla, D. S., Perakis, I. E.
We review recent investigations of the femtosecond non-linear optical response of the two-dimensional electron gas (2DEG) in a strong magnetic field. We probe the Quantum Hall (QH) regime for filling...
Kaindl, R.A., Hagele, D., Carnahan, M.A., Lovenich, R., Chemla, D.S.
We employ ultrafast terahertz (THz) pulses to study the dynamical interplay of optically-induced excitons and unbound electron-hole pairs in GaAs/AlGaAs quantum wells. A distinct low-energy...
Cooper pair formation dynamics in Bi2Sr2CaCu2O8+delta (2003)
Kaindl, R.A., Carnahan, M.A., Orenstein, J., Chemla, D.S., Oh, S., Eckstein, J.N.
We utilize ultrafast terahertz pulses to monitor the carrier dynamics in the high-TC superconductor Bi2Sr2CaCu2O8+delta. The temperature, density and timedependence distinctly exposes a bimolecular...
Charge transport and phase transition in exciton rings (2003)
Butov, L. V., Levitov, L. S., Mintsev, A. V., Simons, B. D., Gossard, A. C., Chemla, D. S.
The macroscopic exciton rings observed in the photoluminescence (PL) patterns of excitons in coupled quantum wells (CQWs) are explained by a series of experiments and a theory based on the idea of...
Nonequilibrium THz Conductivity of Bi2Sr2CaCu2O8+d (2003)
Carnahan, M.A., Kaindl, R.A., Orenstein, J., Chemla, D.S., Oh, S., Eckstein, J.N.
Using high sensitivity visible-pump/THz-probe spectroscopy we investigate the dynamics of the complex optical conductivity in optimally-doped Bi2Sr2CaCu2O8+d films directly after photoexcitation. The...
Exciton dynamics studied via internal THz transitions (2003)
Kaindl, R.A., Hagele, D., Carnahan, M.A., Lovenich, R., Chemla, D.S.
We employ a novel, ultrafast terahertz probe to investigate the dynamical interplay of optically-induced excitons and unbound electron-hole pairs in GaAs quantum wells. Resonant creation of...
Karathanos, A. T., Perakis, I. E., Fromer, N. A., Chemla, D. S.
We present a theoretical formulation of the coherent ultrafast nonlinear optical response of a strongly correlated system and discuss an example where the Coulomb correlations dominate. We separate...
Macroscopically ordered state in exciton system (2002)
Butov, L. V., Gossard, A. C., Chemla, D. S.
Macroscopically ordered arrays of vortices in quantum liquids, such as superconductors, He-II, and atom Bose-Einstein Condensates (BEC), demonstrate macroscopic coherence in flowing superfluids...
Development of Chalcopyrite Crystals for Nonlinear Optical Applications. (2002)
Begley,R. F., Byer,R. L., Chemla,D. S., Choy,M. M., Herbst,R. L.
This final report summarizes recent progress in the growth of three chalcopyrite crystals, CdGeAs2, AgGaSe2 and AgGaS2. Recent applications of these crystals to the generation of tunable infrared...
Zener tunneling in superlattices in a magnetic field (2002)
Meinhold, D., Leo, K., Fromer, N.A., Chemla, D.S., Glutsch, S., Bechstedt, F., ...
We present a study of the Zener effect in the optical absorption of strongly coupled superlattices with both a magnetic and an electric field in growth direction. The in-plane continuum of electron...
Lövenich, J. H. R., Lai, C. W., Hägele, D., Chemla, D. S., Schäfer, W.
This version is available at the following Publisher URL: http://prb.aps.org
Far-infrared optical conductivity gap in superconducting MgB2 films (2001)
Kaindl, R. A., Carnahan, M. A., Orenstein, J., Chemla, D. S., Christen, H. M., Zhai, H., ...
We report the first study of the optical conductivity of MgB2 covering the range of its superconducting energy gap. Terahertz time-domain spectroscopy is utilized to determine the complex,...
Parity forbidden excitations of Sr2CuO2Cl2 revealed by optical third-harmonic spectroscopy (2001)
Schumacher, A. B., Dodge, J. S., Carnahan, M. A., Kaindl, R. A., Chemla, D. S., Miller, L. L.
We present the first study of nonlinear optical third harmonic generation in the strongly correlated charge-transfer insulator Sr2CuO2Cl2. For fundamental excitation in the near-infrared, the THG...
Lövenich, R., Schumacher, A. B., Dodge, J. S., Chemla, D. S., Miller, L. L.
We present a comparative experimental and theoretical investigation of the two--dimensional charge-transfer gap in the strongly correlated material Sr$_2$CuO$_2$Cl$_2$. We observe an Urbach behaviour...
Ultrahigh resolution multicolor colocalization of single fluorescent nanocrystals (2000)
Michalet, X., Lacoste, T.D., Pinaud, F., Chemla, D.S., Alivisatos, A.P., Weiss, S.
A new method for in vitro and possibly in vivo ultrahigh-resolution colocalization and distance measurement between biomolecules is described, based on semiconductor nanocrystal probes. This ruler...
Time-resolved optical observation of spin-wave dynamics (1999)
Dodge, J. S., Schumacher, A. B., Chemla, D. S., Ingle, N., Beasley, M. R.
We have created a nonequilibrium population of antiferromagnetic spin-waves in Cr2O3, and characterized its dynamics, using frequency- and time-resolved nonlinear optical spectroscopy of the...
Electronic Dephasing in the Quantum Hall Regime (1999)
Fromer, N. A., Schüller, C., Chemla, D. S., Shahbazyan, T. V., Perakis, I. E., Maranowski, K., ...
By means of degenerate four-wave mixing (FWM), we investigate the quantum coherence of electron-hole pairs in the presence of a two-dimensional electron gas in modulation-doped GaAs-AlGaAs quantum...
Coherent Ultrafast Optical Dynamics of the Fermi Edge Singularity (1999)
Primozich, N., Shahbazyan, T. V., Perakis, I. E., Chemla, D. S.
We develop a non-equilibrium many-body theory of the coherent femtosecond nonlinear optical response of the Fermi edge singularity. We study the role of the dynamical Fermi sea response in the...
Femtosecond Coherent Dynamics of the Fermi Edge Singularity and Exciton Hybrid (1999)
Shahbazyan, T. V., Primozich, N., Perakis, I. E., Chemla, D. S.
We study theoretically the coherent nonlinear optical response of doped semiconductors with partially occupied subbands. When the Fermi energy of an occupied subband approaches the exciton level of...
Temperature Dependence of the Resonant Tunneling Process, (1992)
Bar-Joseph, I., Gedalyahu, Y., Yacoby, A., Woodward, T. K., Chemla, D. S.
We use differential absorption spectroscopy to investigate the temperature dependence of the accumulated charge in a resonant tunneling diode. We find that the charge density is approximately...
Electron Transport in Double Barrier Diodes Studied by Differential Absorption Spectroscopy, (1992)
Woodward, T. K., Chemla, D. S., Bar-Joseph, I., Sivco, D. L., Cho, A. Y.
Double barrier tunneling heterostructures are part of an emerging class of devices that rely on quantum-mechanical effects for their operation. A deeper understanding of these devices is possible...
The Temperature Dependence of the Resonant Tunneling Process, (1992)
Bar-Joseph, I., Gedalyahu, Y., Yacoby, A., Woodward, T. K., Chemla, D. S.
The nature of a resonant tunneling process that involves inelastic scattering events is of a wide interest lately. In this paper, we investigate the influence of inelastic scattering by measuring the...
Zyss, J., Chemla, D.S., Vilminot, S., Cot, L., Maurin, M.
La génération de second harmonique dans l'ultraviolet, amène à étudier les propriétés de fluorures complexes sous forme de cristaux centrosymétriques. Après une description de la...
Zyss, J., Chemla, D.S., Vilminot, S., Cot, L., Maurin, M.
La génération de second harmonique dans l'ultraviolet, amène à étudier les propriétés de fluorures complexes sous forme de cristaux centrosymétriques. Après une description de la...
Zyss, J., Chemla, D.S., Vilminot, S., Cot, L., Maurin, M.
La génération de second harmonique dans l'ultraviolet, amène à étudier les propriétés de fluorures complexes sous forme de cristaux centrosymétriques. Après une description de la...
Kupecek, P.J., Chemla, D.S., Le Person, H.
Dans cet article nous présentons les résultats d'un ensemble d'études expérimentales sur les propriétés non linéaires optiques de cristaux de cinabre (α-HgS) synthétiques obtenus par...
Kupecek, P.J., Chemla, D.S., Le Person, H.
Dans cet article nous présentons les résultats d'un ensemble d'études expérimentales sur les propriétés non linéaires optiques de cristaux de cinabre (α-HgS) synthétiques obtenus par...
Kupecek, P.J., Chemla, D.S., Le Person, H.
Dans cet article nous présentons les résultats d'un ensemble d'études expérimentales sur les propriétés non linéaires optiques de cristaux de cinabre (α-HgS) synthétiques obtenus par...
Susceptibilité du deuxième ordre et structure cristalline des iodates (1975)
Duraffourg, G., Chemla, D.S., Jerphagnon, J.
Dans l'étude des propriétés diélectriques des cristaux il est courant de faire l'hypothèse de l'additivité des polarisations microscopiques pour tenter d'obtenir les propriétés microscopiques...
Susceptibilité du deuxième ordre et structure cristalline des iodates (1975)
Duraffourg, G., Chemla, D.S., Jerphagnon, J.
Dans l'étude des propriétés diélectriques des cristaux il est courant de faire l'hypothèse de l'additivité des polarisations microscopiques pour tenter d'obtenir les propriétés microscopiques...
Susceptibilité du deuxième ordre et structure cristalline des iodates (1975)
Duraffourg, G., Chemla, D.S., Jerphagnon, J.
Dans l'étude des propriétés diélectriques des cristaux il est courant de faire l'hypothèse de l'additivité des polarisations microscopiques pour tenter d'obtenir les propriétés microscopiques...
Ha, T, Enderle, T, Ogletree, D F, Chemla, D S, Selvin, P R, Weiss, S
We extend the sensitivity of fluorescence resonance energy transfer (FRET) to the single molecule level by measuring energy transfer between a single donor fluorophore and a single acceptor...
Ha, T, Enderle, T, Ogletree, D F, Chemla, D S, Selvin, P R, Weiss, S
We extend the sensitivity of fluorescence resonance energy transfer (FRET) to the single molecule level by measuring energy transfer between a single donor fluorophore and a single acceptor...