**Comment on "Quantum Theory of Secondary Emission in Optically Excited Semiconductor Quantum Wells"**

S. Savasta, G. Martino, and R. Girlanda

Phys. Rev. Lett.**83**, 4674 (1999)**Imaging Spectroscopy of Two-Dimensional Excitons in a Narrow GaAs/AlGaAs Quantum Well**

Qiang Wu, Robert D. Grober, D. Gammon and D. S. Katzer

Phys. Rev. Lett.**83**, 2652 (1999)**Monte Carlo Simulations of Ultrafast Resonant Rayleigh Scattering from Quantum Well Excitons: Beyond Ensemble Averaging**

Andrei V. Shchegrov, Dan Birkedal and Jagdeep Shah

Phys. Rev. Lett.**83**, 1391 (1999)**Quantum Theory of Secondary Emission in Optically Excited Semiconductor Quantum Wells**

M. Kira, F. Jahnke, and S. W. Koch

Phys. Rev. Lett.**82**, 3544 (1999)**Charged excitons in ZnSe-based quantum wells**

G. V. Astakhov, D. R. Yakovlev, V. P. Kochereshko, W. Ossau, J. Nürnberger, W. Faschinger, and G. Landwehr

Phys. Rev. B**60**, R8485 (1999)**Optical second-harmonic generation from Ag quantum wells on Si(111)7×7: Experiment and theory**

Thomas Garm Pedersen, Kjeld Pedersen, and Thomas Brun Kristensen

Phys. Rev. B**60**, R13997 (1999)**Near-field dynamics of excitonic wave packets in semiconductor quantum wells**

B. Hanewinkel, A. Knorr, P. Thomas, and S. W. Koch

Phys. Rev. B**60**, 8975 (1999)**Optical transition energies for lead-salt semiconductor quantum wells**

Erasmo A. de Andrada e Silva

Phys. Rev. B**60**, 8859 (1999)**Effects of macroscopic polarization in III-V nitride multiple quantum wells**

Vincenzo Fiorentini, Fabio Bernardini, Fabio Della Sala, Aldo Di Carlo, and Paolo Lugli

Phys. Rev. B**60**, 8849 (1999)**Magneto-optics of the spatially separated electron and hole layers in GaAs/AlxGa1**

L. V. Butov, A. A. Shashkin, V. T. Dolgopolov, K. L. Campman and A. C. Gossard

Phys. Rev. B**60**, 8753 (1999)**Heavy-hole and light-hole oscillations in the coherent emission from quantum wells: Evidence for exciton-exciton correlations**

Arthur L. Smirl, Martin J. Stevens, X. Chen, and O. Buccafusca

Phys. Rev. B**60**, 8267 (1999)**Birefringence in the transparency region of GaAs/AlAs multiple quantum wells**

A. A. Sirenko, P. Etchegoin, A. Fainstein, K. Eberl and M. Cardona

Phys. Rev. B**60**, 8253 (1999)**Larmor beats and conduction electron g factors in InxGa1**

A. Malinowski, D. J. Guerrier, N. J. Traynor, and R. T. Harley

Phys. Rev. B**60**, 7728 (1999)**Quantum beats between trion and exciton transitions in modulation-doped CdTe quantum wells**

P. Gilliot, D. Brinkmann, J. Kudrna, O. Crégut, R. Lévy, A. Arnoult, J. Cibert, and S. Tatarenko

Phys. Rev. B**60**, 5797 (1999)**Hyperspherical approach for charged excitons in quantum wells**

W. Y. Ruan, K. S. Chan, H. P. Ho, R. Q. Zhang and E. Y. B. Pun

Phys. Rev. B**60**, 5714 (1999)**Weak localization of biexcitons in quantum wells**

O. Mayrock, H.-J. Wünsche, F. Henneberger, C. Riva, V. A. Schweigert, and F. M. Peeters

Phys. Rev. B**60**, 5582 (1999)**Ionization degree of the electron-hole plasma in semiconductor quantum wells**

M. E. Portnoi and I. Galbraith

Phys. Rev. B**60**, 5570 (1999)**Ultrafast exciton dynamics in ternary II-VI semiconductor quantum wells**

M. C. Netti, C. Gadaleta, N. Del Fatti, F. Vallée and R. Tommasi

Phys. Rev. B**60**, 4902 (1999)**Optical control of the two-dimensional electron-gas density in single asymmetric quantum wells: Magnetic-field effect**

A. J. C. Cardoso, Fanyao Qu, and P. C. Morais

Phys. Rev. B**60**, 4501 (1999)**Trion and exciton dephasing measurements in modulation-doped quantum wells: A probe for trion and carrier localization**

D. Brinkmann, J. Kudrna, P. Gilliot, B. Hönerlage, A. Arnoult, J. Cibert, and S. Tatarenko

Phys. Rev. B**60**, 4474 (1999)**Microscopic theory of optical nonlinearities and spontaneous emission lifetime in group-III nitride quantum wells**

W. Chow, M. Kira and S. W. Koch

Phys. Rev. B**60**, 1947 (1999)**Optical properties of GaAs/Al1**

G. Rau, A. R. Glanfield, P. C. Klipstein, N. F. Johnson and G. W. Smith

Phys. Rev. B**60**, 1900 (1999)**Resonant terahertz excitation of tunnel-coupled quantum wells: Nonlinear absorption and photovoltage**

F. T. Vasko, A. Hernández-Cabrera and P. Aceituno

Phys. Rev. B**60**, 1811 (1999)**Segregation, interface morphology, and the optical properties of GaAs/AlAs quantum wells: A theoretical study**

Belita Koiller, R. B. Capaz and H. Chacham

Phys. Rev. B**60**, 1787 (1999)**Terahertz sideband generation in quantum wells viewed as resonant photon tunneling through a time-dependent barrier: An exactly solvable model**

D. S. Citrin and W. Harshawardhan

Phys. Rev. B**60**, 1759 (1999)**Local-field study of phase conjugation in metallic quantum wells with probe fields of both propagating and evanescent character**

Torsten Andersen and Ole Keller

Phys. Rev. B**60**, 17046 (1999)**Exciton-electron dynamics studied by microwave photoconductivity and photoluminescence in undoped GaAs/Al0.3Ga0.7As quantum wells**

M. Kozhevnikov, B. M. Ashkinadze, E. Cohen, Arza Ron and Hadas Shtrikman

Phys. Rev. B**60**, 16894 (1999)**Electron and hole microwave cyclotron resonance in photoexcited undoped GaAs/Al0.3Ga0.7As multiple quantum wells**

M. Kozhevnikov, E. Cohen, Arza Ron and Hadas Shtrikman

Phys. Rev. B**60**, 16885 (1999)**Optical gain in GaN quantum wells with many-body effects**

G. B. Ren and Peter Blood

Phys. Rev. B**60**, 16675 (1999)**Two-dimensional exciton dynamics and gain formation processes in InxGa1**

Akihiro Satake, Yasuaki Masumoto, Takao Miyajima, Tsunenori Asatsuma, and Masao Ikeda

Phys. Rev. B**60**, 16660 (1999)**Retardation effects on intra- and intersubband plasmons in quantum wells and their manifestations in grating-coupler-assisted optical transmission**

L. Wendler and T. Kraft

Phys. Rev. B**60**, 16603 (1999)**Magnetoexciton escape from shallow quantum wells induced by in-plane electric fields**

A. Getter and I. E. Perakis

Phys. Rev. B**60**, 16027 (1999)**Neutral and positively charged excitons: A magneto-optical study of a p-doped Cd1**

P. Kossacki, J. Cibert, D. Ferrand, Y. Merle d'Aubigné, A. Arnoult, A. Wasiela, and S. Tatarenko and J. A. Gaj

Phys. Rev. B**60**, 16018 (1999)**Magneto-optical studies of the correlation between interface microroughness parameters and the photoluminescence line shape in GaAs/Ga0.7Al0.3As quantum wells**

J. B. B. de Oliveira, E. A. Meneses and E. C. F. da Silva

Phys. Rev. B**60**, 1519 (1999)**TE- and TM-polarized roughness-assisted free-carrier absorption in quantum wells at midinfrared and terahertz wavelengths**

I. Vurgaftman and J. R. Meyer

Phys. Rev. B**60**, 14294 (1999)**Effect of the insertion of an ultrathin AlP layer on the optical properties of GaAsP/GaP quantum wells**

K. Arimoto, T. Sugita, N. Usami, and Y. Shiraki

Phys. Rev. B**60**, 14255 (1999)**Effect of the insertion of an ultrathin AlP layer on the optical properties of GaAsP/GaP quantum wells**

K. Arimoto, T. Sugita, N. Usami, and Y. Shiraki

Phys. Rev. B**60**, 13735 (1999)**Doubly resonant terahertz sideband generation in quantum wells: Optical signatures of terahertz-dressed subbands**

D. S. Citrin

Phys. Rev. B**60**, 13695 (1999)**Resonances in low-energy electron transmission through organized organic films: Evidence for molecular quantum wells**

K. Ray, A. Shanzer, D. H. Waldeck and R. Naaman

Phys. Rev. B**60**, 13347 (1999)**Positive and negative persistent photoconductivity in a two-side-doped In0.53Ga0.47As/In0.52Al0.48As quantum well**

D. R. Hang, Y. F. Chen, F. F. Fang and W. I. Wang

Phys. Rev. B**60**, 13318 (1999)**Dipole matrix elements and the nature of charge oscillation under coherent interband excitation in quantum wells**

R. A. Coles, R. A. Abram, S. Brand and M. G. Burt

Phys. Rev. B**60**, 13306 (1999)**Optical spectroscopy study of the phase of the reflection coefficient of a single quantum well in the exciton resonance region**

G. Malpuech, A. Kavokin, J. Leymarie, P. Disseix, and A. Vasson

Phys. Rev. B**60**, 13298 (1999)**Energy spectrum, density of states, and optical transitions in strongly biased narrow-gap quantum wells**

O. E. Raichev, P. Vasilopoulos and F. T. Vasko

Phys. Rev. B**60**, 11030 (1999)**Resonant hole states in a quantum well with semimagnetic barriers**

F. V. Kyrychenko and Yu. G. Semenov

Phys. Rev. B**60**, 10941 (1999)**Electron-spin polarization near the Fermi level in n-type modulation-doped semiconductor quantum wells**

A. L. C. Triques, J. Urdanívia, F. Iikawa, M. Z. Maialle, J. A. Brum and G. Borhgs

Phys. Rev. B**59**, R7813 (1999)**Indium segregation effects in (111)B-grown (In,Ga)As/GaAs piezoelectric quantum wells**

Philippe Ballet, Pierre Disseix, Joël Leymarie, Aimé Vasson, Anne-Marie Vasson and Robert Grey

Phys. Rev. B**59**, R5308 (1999)**Creation of highly anisotropic wave packets in quantum wells: Dynamical Franz-Keldysh effect in the optical and terahertz regimes**

S. Hughes and D. S. Citrin

Phys. Rev. B**59**, R5288 (1999)**Comparative study of the negatively and positively charged excitons in GaAs quantum wells**

Shmuel Glasberg, Gleb Finkelstein, Hadas Shtrikman, and Israel Bar-Joseph

Phys. Rev. B**59**, R10425 (1999)**Observation of long-lived oblique excitons in GaN-AlGaN multiple quantum wells**

B. Gil, P. Lefebvre, J. Allègre, H. Mathieu, N. Grandjean, M. Leroux, J. Massies, P. Bigenwald and P. Christol

Phys. Rev. B**59**, R10246 (1999)**Resonance tunneling through photonic quantum wells**

Y. Jiang, C. Niu, and D. L. Lin

Phys. Rev. B**59**, 9981 (1999)**Phase transitions of electron-hole and unbalanced electron systems in coupled quantum wells in high magnetic fields**

Yu. E. Lozovik, O. L. Berman, and V. G. Tsvetus

Phys. Rev. B**59**, 5627 (1999)**Photoluminescence studies of 100 and 111 InxGa1**

T. Sauncy, M. Holtz, O. Brafman, D. Fekete, and Y. Finkelstein

Phys. Rev. B**59**, 5056 (1999)**Excitation intensity dependence of photoluminescence from narrow 100- and 111A-grown InxGa1**

T. Sauncy, M. Holtz, O. Brafman, D. Fekete, and Y. Finkelstein

Phys. Rev. B**59**, 5049 (1999)**Dispersion of polar optical phonons in wurtzite quantum wells**

S. M. Komirenko, K. W. Kim, M. A. Stroscio and M. Dutta

Phys. Rev. B**59**, 5013 (1999)**Dynamics of exciton localization in CdS/HgS quantum-dot quantum wells**

Alvin T. Yeh, Giulio Cerullo, Uri Banin, Alf Mews, A. Paul Alivisatos and Charles V. Shank

Phys. Rev. B**59**, 4973 (1999)**Mixed biexcitons in single quantum wells**

H. P. Wagner, W. Langbein and J. M. Hvam

Phys. Rev. B**59**, 4584 (1999)**Photomodulated reflectance of InxGa1**

P. J. Klar, G. Rowland, P. J. S. Thomas, A. Onischenko, T. E. Sale, T. J. C. Hosea and R. Grey

Phys. Rev. B**59**, 2902 (1999)**Intraband terahertz emission from coupled semiconductor quantum wells: A model study using the exciton representation**

Wei Min Zhang, Torsten Meier, Vladimir Chernyak, and Shaul Mukamel

Phys. Rev. B**59**, 2599 (1999)**Well-width dependence of exciton-phonon scattering in InxGa1**

P. Borri, W. Langbein, J. M. Hvam and F. Martelli

Phys. Rev. B**59**, 2215 (1999)**Persistent photoconductivity in semimetallic AlxGa1**

L. C. Tsai, J. C. Fan, Y. F. Chen and Ikai Lo

Phys. Rev. B**59**, 2174 (1999)**Mn spin domains in highly photoexcited (Cd,Mn)Te/(Cd,Mg)Te quantum wells**

M. G. Tyazhlov, V. D. Kulakovskii, A. I. Filin, D. R. Yakovlev, A. Waag, and G. Landwehr

Phys. Rev. B**59**, 2050 (1999)**Scaling of exciton binding energy and virial theorem in semiconductor quantum wells and wires**

Yong Zhang and A. Mascarenhas

Phys. Rev. B**59**, 2040 (1999)**Photoluminescence kinetics of indirect excitons in GaAs/AlxGa1**

L. V. Butov, A. Imamoglu, A. V. Mintsev, K. L. Campman and A. C. Gossard

Phys. Rev. B**59**, 1625 (1999)**Chemical equilibrium between excitons, electrons, and negatively charged excitons in semiconductor quantum wells**

J. Siviniant, D. Scalbert, A. V. Kavokin, D. Coquillat, and J-P. Lascaray

Phys. Rev. B**59**, 1602 (1999)**Optical study of Al0.4Ga0.6Sb/GaSb single quantum wells**

R. Ferrini, M. Geddo, G. Guizzetti, M. Patrini, S. Franchi, C. Bocchi, E. Kh. Mukhamedzhanov, A. Baraldi and R. Magnanini

Phys. Rev. B**59**, 15395 (1999)**Quantum interference and nonlinear optical processes in the conduction bands of infrared-coupled quantum wells**

S. M. Sadeghi, S. R. Leffler, and J. Meyer

Phys. Rev. B**59**, 15388 (1999)**Time-resolved photoluminescence as a probe of internal electric fields in GaN-(GaAl)N quantum wells**

Pierre Lefebvre, Jacques Allègre, Bernard Gil, Henry Mathieu, Nicolas Grandjean, Mathieu Leroux, Jean Massies and Pierre Bigenwald

Phys. Rev. B**59**, 15363 (1999)**Application of numerical exciton-wave-function calculations to the question of band alignment in Si/Si1**

C. Penn, F. Schäffler, G. Bauer and S. Glutsch

Phys. Rev. B**59**, 13314 (1999)**Coupling of infrared radiation to intersubband transitions in multiple quantum wells: The effective-medium approach**

M. Zauny and C. Nalewajko

Phys. Rev. B**59**, 13043 (1999)**Femtosecond four-wave-mixing spectroscopy of interacting magnetoexcitons in semiconductor quantum wells**

S. Yokojima, T. Meier, V. Chernyak, and S. Mukamel

Phys. Rev. B**59**, 12584 (1999)**Fano interference of collective excitations in semiconductor quantum wells and lasing without inversion**

Dmitri E. Nikonov, Ataç Imamolu and Marlan O. Scully

Phys. Rev. B**59**, 12212 (1999)**Wave-function mapping in multiple quantum wells using diluted magnetic semiconductors**

S. Lee, M. Dobrowolska, J. K. Furdyna and L. R. Ram-Mohan

Phys. Rev. B**59**, 10302 (1999)**Dimensionality of excitons in laser-diode structures composed of InxGa1**

Yukio Narukawa, Yoichi Kawakami, Shigeo Fujita and Shuji Nakamura

Phys. Rev. B**59**, 10283 (1999)**Electronic structure and optical properties of ultrathin CdS/ZnS quantum wells grown by molecular-beam epitaxy**

M. Hetterich, Ch. Märkle, A. Dinger, M. Grün, and C. Klingshirn

Phys. Rev. B**59**, 10268 (1999)**Exciton dynamics in GaAs/AlxGa1**

K. Litvinenko, D. Birkedal, V. G. Lyssenko and J. M. Hvam

Phys. Rev. B**59**, 10255 (1999)**Interband and intersubband absorption in HgCdTe multiple quantum wells**

A. M. de Paula, C. R. M. de Oliveira, G. E. Marques, A. M. Cohen, R. D. Feldman, R. F. Austin, M. N. Islam and C. L. Cesar

Phys. Rev. B**59**, 10158 (1999)