@article{43339,
author = {{Meier, Torsten and Thomas, P. and Koch, S.W.}},
journal = {{Physics of Low-Dimensional Structures (PLDS)}},
number = {{3-4}},
pages = {{1--44}},
title = {{{Coherent Effects in Photoexcited Semiconductor Superlattices with Electric Fields}}},
volume = {{1998}},
year = {{1998}},
}
@article{26009,
abstract = {{Lamellar mesostructured aluminophosphates were synthesized from aluminum triisopropoxide and phosphoric acid; monododecyl phosphate surfactant was used as structure-directing template. Depending on the relative Al/P ratio in the samples, variable relative amounts of tetrahedrally and octahedrally coordinated Al are found, indicating that both aluminophosphate and aluminum oxide species (as thermodynamically favored) are being formed in the syntheses. This is investigated quantitatively by Al K-edge XANES spectroscopy. The same syntheses were carried out without phosphoric acid, resulting in similar lamellar structures. The inorganic lamellae of these products consist to a significant extent of aluminophosphate rather than exclusively of aluminum oxide, which means that the phosphate headgroups of the surfactant molecules become incorporated into the inorganic network. Thus, for the first time, the surfactant serves as both template and reactant.}},
author = {{Fröba, Michael and Tiemann, Michael}},
issn = {{0897-4756}},
journal = {{Chemistry of Materials}},
pages = {{3475--3483}},
title = {{{A New Role of the Surfactant in the Synthesis of Mesostructured Phases: Dodecyl Phosphate as Template and Reactant for Aluminophosphates}}},
doi = {{10.1021/cm980712c}},
year = {{1998}},
}
@article{43340,
abstract = {{Femtosecond two beam and three beam ( ω1,ω1;ω2) four-wave mixing (FWM) experiments on GaAs quantum wells have been performed using two partially synchronized, independently tunable lasers with external jitter compensation. Heavy and light hole beatings are observed with these two mutually incoherent lasers. FWM signals are observed when ω2 is completely below the exciton energies, with no spectral overlap with the absorption profile. These off-resonant signals are stronger than the interband continuum signals for equivalent detunings.}},
author = {{Meier, Torsten and Kim, D.S. and Sohn, J.Y. and Yahng, J.S. and Ahn, Y. H. and Yee, K.J. and Yee, D.S. and Cho, Y.D. and Hong, S.C. and Kim, W.S. and Woo, J.C. and Koch, S.W. and Woo, D.H. and Kim, E. K. and Kim , S.H. and Kim, C.S.}},
journal = {{Physical review letters}},
number = {{21}},
pages = {{4803--4806}},
publisher = {{American Physical Society}},
title = {{{Femtosecond four-wave mixing experiments on GaAs quantum wells using two independently tunable lasers}}},
doi = {{10.1103/PhysRevLett.80.4803}},
volume = {{80}},
year = {{1998}},
}
@article{43341,
abstract = {{Closed Green-function expressions for the third-order response of semiconductors are derived by mapping the two-band model onto the much simpler molecular (Frenkel) Hamiltonian. The signatures of two-exciton resonances are incorporated through the exciton scattering matrix, totally avoiding the explicit calculation of two-exciton states. Exact expressions for the nonlinear optical response of two-dimensional semiconductor nanostructures in a strong perpendicular magnetic field are derived by truncating at the n=1 Landau level, and using the symmetry of the system and a group-theoretical analysis. We find that the nonlinear optical response depends crucially on asymmetries between particle-particle and particle-hole Coulomb interactions.}},
author = {{Meier, Torsten and Chernyak, V. and Yokojima, S. and Mukamel, S.}},
journal = {{Physical Review B}},
number = {{8}},
pages = {{4496--4516}},
publisher = {{American Physical Society}},
title = {{{Effective Frenkel Hamiltonian for optical nonlinearities in semiconductors: Application to magnetoexcitons}}},
doi = {{10.1103/PhysRevB.58.4496}},
volume = {{58}},
year = {{1998}},
}
@article{43343,
abstract = {{In his Comment on our work Glutsch raises, on the basis of a calculation for a dimerized three-dimensional superlattice, four points: (1) odd-parity excitons do not contribute to optical absorption, (2) there are no forbidden single-particle transitions, (3) there is a coupling of the e1-hh2 exciton (called ¯X in Ref. 1) to the underlying e1-hh1 continuum that leads to a Fano resonance, and (4) the extension of the exciton wave function is infinite in an all space directions rather than having a small extension. In this Reply these four points are addressed and it is shown that our previous conclusions remain valid.}},
author = {{Meier, Torsten and Bott, K. and Hader, J. and Brinkmann, D. and Koch, S.W. and Thomas, P.}},
journal = {{Physical Review B}},
number = {{23}},
publisher = {{American Physical Society}},
title = {{{Reply to Comment on "Odd-parity excitons in semiconductor superlattices"}}},
doi = {{10.1103/PhysRevB.58.15911}},
volume = {{58}},
year = {{1998}},
}
@article{43344,
abstract = {{Absorption and differential electroabsorption spectra of a GaInAs/InP superlattice in the regime of Wannier–Stark localization are compared with spectra derived from the Semiconductors Bloch Equations. The absorption is strongly underestimated for higher energies by the effective mass approximation but good agreement is achieved by using an energy dependent in-plane effective mass. No fitting parameters are used except for a phenomenological broadening. The lineshape of the field-modulated spectra is dominated by the strong field dependence of Wannier–Stark transitions and depends on the amplitude of the modulating field which should be kept small for best results.
REFERENCES}},
author = {{Meier, Torsten and Thränhardt, A. and Kolbe, H.J. and Hader, J. and Weiser, G. and Koch, S.W.}},
journal = {{Applied Physics Letters}},
number = {{18}},
pages = {{2612--2614}},
publisher = {{American Institute of Physics}},
title = {{{Field-dependent absorption in superlattices: Comparison of theory and experiment}}},
doi = {{10.1063/1.122522}},
volume = {{73}},
year = {{1998}},
}
@article{43342,
abstract = {{The four-wave mixing (FWM) signal of a semiconductor superlattice with an external electric
field is evaluated using the semiconductor Bloch equations. It is found that the FWM signal for
a GaAs/AlGaAs-semiconductor superlattices with a lattice constant d has a deep valley when the
electric field is around eF d = 1 meV. It is also found that the deep valley comes mainly from the
broken inversion symmetry caused by the exteral electric field and that the field intensity determines
the sign and the magnitude of the Coulomb-induced optical nonlinearities.}},
author = {{Meier, Torsten and Je, K.-C and Kim, Y. and Koch, S.W.}},
journal = {{Journal of the Korean Physical Society}},
number = {{4}},
pages = {{437--440}},
title = {{{Field-Induced Four-Wave Mixing Signal in Semiconductor Superlattices}}},
volume = {{32}},
year = {{1998}},
}
@inproceedings{44274,
abstract = {{Femtosecond four-wave mixing experiments on GaAs/AlGaAs quantum wells are performed with two independently tunable lasers. Many new results are found, including the heavy-hole-light-hole beating with these two mutually incoherent lasers.}},
author = {{Meier, Torsten and Yahng, J.S. and Ahn, Y. H. and Sohn, J.Y. and Koch, S.W. and Kim, D.S.}},
booktitle = {{Ultrafast Phenomena XI}},
isbn = {{10.1007/978-3-642-72289-9_70}},
location = {{Garmisch-Partenkirchen, Germany}},
pages = {{236--238}},
publisher = {{Springer, Berlin, Heidelberg}},
title = {{{Femtosecond Two Color Four-Wave Mixing Experiments on GaAs Quantum Wells Using Two Independently Tunable Lasers}}},
doi = {{10.1007/978-3-642-72289-9_70}},
year = {{1998}},
}
@article{13773,
author = {{Schmidt, Wolf Gero and Bechstedt, F. and Esser, N. and Pristovsek, M. and Schultz, Ch. and Richter, W.}},
issn = {{0163-1829}},
journal = {{Physical Review B}},
number = {{23}},
pages = {{14596--14599}},
title = {{{Atomic structure of InP(001)-(2×4): A dimer reconstruction}}},
doi = {{10.1103/physrevb.57.14596}},
volume = {{57}},
year = {{1998}},
}
@article{13772,
author = {{Schmidt, Wolf Gero and Bechstedt, F.}},
issn = {{0039-6028}},
journal = {{Surface Science}},
number = {{3}},
pages = {{474--484}},
title = {{{Geometry and electronic structure of InP(001)(2×4) reconstructions}}},
doi = {{10.1016/s0039-6028(98)00260-x}},
volume = {{409}},
year = {{1998}},
}
@article{13771,
author = {{Shkrebtii, A. I. and Esser, N. and Richter, W. and Schmidt, Wolf Gero and Bechstedt, F. and Fimland, B. O. and Kley, A. and Del Sole, R.}},
issn = {{0031-9007}},
journal = {{Physical Review Letters}},
number = {{3}},
pages = {{721--724}},
title = {{{Reflectance Anisotropy of GaAs(100): Theory and Experiment}}},
doi = {{10.1103/physrevlett.81.721}},
volume = {{81}},
year = {{1998}},
}
@article{13774,
author = {{Schmidt, Wolf Gero and Käckell, P. and Bechstedt, F.}},
issn = {{0169-4332}},
journal = {{Applied Surface Science}},
pages = {{136--140}},
title = {{{In-induced (4 × 2) reconstructions of GaAs(001) surfaces}}},
doi = {{10.1016/s0169-4332(97)00510-2}},
volume = {{123-124}},
year = {{1998}},
}
@article{25930,
author = {{Toeller, M and Buyken, Anette and Heitkamp, G and Milne, R and Klischan, A and Gries, FA}},
issn = {{0954-3007}},
journal = {{Eur J Clin Nutr}},
number = {{2}},
pages = {{74--80}},
title = {{{Repeatability of three-day dietary records in the EURODIAB IDDM Complications Study.}}},
doi = {{10.1038/sj.ejcn.1600364}},
volume = {{51}},
year = {{1997}},
}
@article{35377,
author = {{Müller, Stefan and Fischer, Peter and Schmidt, Claudia}},
issn = {{1155-4312}},
journal = {{Journal de Physique II}},
keywords = {{Physics and Astronomy (miscellaneous), General Engineering, Atomic and Molecular Physics, and Optics}},
number = {{3}},
pages = {{421--432}},
publisher = {{EDP Sciences}},
title = {{{Solid-Like Director Reorientation in Sheared Hexagonal Lyotropic Liquid Crystals as Studied by Nuclear Maginetic Resonance}}},
doi = {{10.1051/jp2:1997135}},
volume = {{7}},
year = {{1997}},
}
@article{35376,
author = {{Siebert, Hartmut and Grabowski, David A. and Schmidt, Claudia}},
issn = {{0035-4511}},
journal = {{Rheologica Acta}},
keywords = {{Condensed Matter Physics, General Materials Science}},
number = {{6}},
pages = {{618--627}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Rheo-NMR study of a non-flow-aligning side-chain liquid crystal polymer in nematic solution}}},
doi = {{10.1007/bf00367357}},
volume = {{36}},
year = {{1997}},
}
@article{27948,
author = {{Bigga, Regine}},
journal = {{Hauswirtschaftliche Bildung }},
number = {{4}},
pages = {{170--174}},
title = {{{Blinde Flecken in der Berufsorientierung im Rahmen der Arbeitslehre. Zusammenhang von Erwerbsarbeit und Hausarbeit fehlt nach wie vor. }}},
volume = {{74}},
year = {{1997}},
}
@article{40000,
author = {{FORGET, SANDRINE and Kitzerow, Heinz-Siegfried}},
issn = {{0267-8292}},
journal = {{Liquid Crystals}},
keywords = {{Condensed Matter Physics, General Materials Science, General Chemistry}},
number = {{6}},
pages = {{919--922}},
publisher = {{Informa UK Limited}},
title = {{{Optical storage effect in a discotic columnar liquid crystal}}},
doi = {{10.1080/026782997207867}},
volume = {{23}},
year = {{1997}},
}
@article{40298,
abstract = {{
The present study shows that a cholesteric gel consisting of a low molar mass liquid crystal and a highly crosslinked anisotropic network can be switched between a transparent and a colored scattering state. The latter state can be induced in an initially non-aligned cholesteric liquid crystal by an electric field, as described recently by Chilaya and coworkers. A short pulse of an electric field can be used to select between the two states which are stable at zero field. The angular dependence of the wavelength of the diffracted light is studied in detail and explained by the known properties of the spatially periodic cholesteric structure.
}},
author = {{Kitzerow, Heinz-Siegfried}},
issn = {{0021-4922}},
journal = {{Japanese Journal of Applied Physics}},
keywords = {{General Physics and Astronomy, General Engineering}},
number = {{3B}},
publisher = {{IOP Publishing}},
title = {{{Bistable Diffractive Electro-Optical Effect in Cholesteric Gels*}}},
doi = {{10.1143/jjap.36.l349}},
volume = {{36}},
year = {{1997}},
}
@article{40300,
abstract = {{
The electrooptic properties due to the transient light scattering mode (TSM) are studied for non-aligned ferroelectric and antiferro-electric liquid crystals with short pitch. The transient light scattering appears in thick samples without polarizers if the sign of an applied dc field is reversed. As a consequence, an ac field of suitable frequency can be used to switch the sample from a transparent to a scattering state. Due to the short pitch, a colored scattering can be observed under oblique angles. The latter effect provides high contrast ratios.
}},
author = {{Kitzerow, Heinz-Siegfried}},
issn = {{0021-4922}},
journal = {{Japanese Journal of Applied Physics}},
keywords = {{General Physics and Astronomy, General Engineering}},
number = {{1R}},
publisher = {{IOP Publishing}},
title = {{{Transient Light Scattering of a Ferroelectric and an Antiferroelectric Liquid Crystal with Short Pitch}}},
doi = {{10.1143/jjap.36.159}},
volume = {{36}},
year = {{1997}},
}
@article{40296,
author = {{Vorflusev, V. P. and Kitzerow, Heinz-Siegfried and Chigrinov, V. G.}},
issn = {{0003-6951}},
journal = {{Applied Physics Letters}},
keywords = {{Physics and Astronomy (miscellaneous)}},
number = {{25}},
pages = {{3359--3361}},
publisher = {{AIP Publishing}},
title = {{{Azimuthal surface gliding of a nematic liquid crystal}}},
doi = {{10.1063/1.119170}},
volume = {{70}},
year = {{1997}},
}