@inproceedings{44290, abstract = {{Summary form only given. For a proper understanding of nonlinear optical experiments in semiconductors even the low-density limit Coulomb-induced many body correlations beyond the Hartree-Fock decoupling scheme need to be considered. In the coherent X(3) limit these correlations manifest themselves in the contributions of bound and unbound two-exciton states to the optical response. The understanding of nonlinear excitonic effects in the Stark effect of semiconductors including carrier-correlations is still of fundamental interest.}}, author = {{Meier, Torsten and Sieh, C. and Koch, S.W. and Brick, P. and Hubner, M. and Ell, C. and Prineas, J. and Khitrova, G. and Gibbs, H.M.}}, booktitle = {{Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference}}, isbn = {{1-55752-576-X}}, location = {{Baltimore, MD, USA}}, pages = {{14--15}}, publisher = {{IEEE}}, title = {{{Influence of carrier-correlations on the optical Stark effect of semiconductors}}}, doi = {{10.1109/QELS.1999.807099}}, year = {{1992}}, } @inproceedings{44289, abstract = {{Recent experiments by Roskos et al. in ultrashort optical pulse excitation of biased coupled quantum wells have shown remarkable generation of terahertz electromagnetic radiation. Two different effects were identified: (i) an oscillatory field of frequency corresponding to the separation between the coupled levels in the quantum-well pair (~ 1.5 THz); and (ii) an “instantaneous” electromagnetic field pulse that appears to follow the time evolution of the exciting laser pulse. The oscillatory field is understood to be caused by the coherent oscillation of optically created electrons from one well to the other.[1] The “instantaneous” part we believe is caused by a new mechanism proposed in Ref. 2. The essence of this “instantaneous” mechanism is that electron-hole pairs are created in a biased semiconductor with a net polarization. The density of these pairs follows the light field, as does the induced polarization, hence, generating an electromagnetic source that follows the light pulse. Such mechanisms have been discussed before for photon energies below the optical bandgap energy,[3] although they have so far been difficult to observe. In our work, we have generalized and extended such effects to photon energies above the handgap energy. In this paper we will discuss both of these mechanisms as well as the fourwave-mixing (FWM) signal,[4] and show how they can be understood within one unified formalism. We will also show that the calculations agree well with the experimental results.}}, author = {{Meier, Torsten and Schulze, A. and Scmittrink, S. and Thomas, P. and Chuang, S.L.}}, booktitle = {{International Quantum Electronics Conference}}, location = {{Vienna, Austria}}, title = {{{Terahertz Electromagnetic Pulse Generation and Four-Wave Mixing in Coupled Quantum Wells}}}, year = {{1992}}, } @inproceedings{44288, abstract = {{In the presence of a homogeneous electric field, 𝐹→, each Bloch state in a crystal changes quasimomentum according to the so-called acceleration theorem Thus, in the absence of interband tunneling and scattering processes, each Bloch state moves at a constant velocity in k-space and executes a periodic motion in the reduced zone scheme by undergoing a Bragg reflection between each two traversals of the Brillouin zone.}}, author = {{Meier, Torsten and von Plessen, G. and Schulze, A. and Thomas, P.}}, booktitle = {{International Quantum Electronics Conference}}, location = {{Vienna, Austria}}, title = {{{On the Observability of Bloch Oscillations in Time-Resolved Four-Wave-Mixing}}}, year = {{1992}}, } @inbook{27966, author = {{Bigga, Regine}}, booktitle = {{Arbeitslehre und Polytechnik: Annäherung und Wandel. Beiträge zur technisch-ökonomischen Allgemeinbildung im vereinten Deutschland. }}, editor = {{Lackmann, Jürgen and Wascher, Uwe}}, pages = {{241--255}}, title = {{{Berufsorientierung für Mädchen zwischen ,,typisch weiblichen" und ,,typisch männlichen" Berufen. }}}, year = {{1991}}, } @article{27965, author = {{Bigga, Regine}}, journal = {{Gewerkschaftliche Bildungspolitik }}, pages = {{44--49}}, title = {{{Berufswahlverhalten und Lebensplanung von Mädchen. Ein Thema für die Schule und eine Aufgabe für die Gewerkschaften. }}}, volume = {{2}}, year = {{1991}}, } @article{27963, author = {{Bigga, Regine}}, journal = {{awt-info}}, pages = {{22--31}}, title = {{{Sexismus am Arbeitsplatz - Ein Tabuthema der Arbeitslehre. }}}, volume = {{1}}, year = {{1991}}, } @article{37465, author = {{Bigga, Regine and Colmorgen, Eckhard and Danker, Uwe and Dittrich, Irene}}, journal = {{Beirat für Geschichte der Arbeiterbewegung und Demokratie in Schleswig-Holstein}}, publisher = {{Neuer Malik Verlag}}, title = {{{Friedhof als Quelle historischen Arbeitens. Der Eichhof Friedhof in Kiel/Kronshagen}}}, volume = {{6}}, year = {{1991}}, } @article{40079, author = {{Kitzerow, Heinz-Siegfried and Crooker, Peter P.}}, issn = {{0015-0193}}, journal = {{Ferroelectrics}}, keywords = {{Condensed Matter Physics, Electronic, Optical and Magnetic Materials}}, number = {{1}}, pages = {{183--196}}, publisher = {{Informa UK Limited}}, title = {{{Polymer-dispersed cholesteric liquid crystals - challenge for research and application}}}, doi = {{10.1080/00150199108226040}}, volume = {{122}}, year = {{1991}}, } @article{40332, author = {{Kitzerow, Heinz-Siegfried and Crooker, P. and Heppke, G.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{General Physics and Astronomy}}, number = {{16}}, pages = {{2151--2154}}, publisher = {{American Physical Society (APS)}}, title = {{{Line shapes of field-induced blue-phase-III selective reflections}}}, doi = {{10.1103/physrevlett.67.2151}}, volume = {{67}}, year = {{1991}}, } @article{40334, author = {{Kitzerow, Heinz-Siegfried and Jérôme, B. and Pieranski, P.}}, issn = {{0378-4371}}, journal = {{Physica A: Statistical Mechanics and its Applications}}, keywords = {{Condensed Matter Physics, Statistics and Probability}}, number = {{1}}, pages = {{163--194}}, publisher = {{Elsevier BV}}, title = {{{Strain-induced anchoring transitions}}}, doi = {{10.1016/0378-4371(91)90423-a}}, volume = {{174}}, year = {{1991}}, } @article{40333, author = {{Kitzerow, Heinz-Siegfried}}, issn = {{1056-8816}}, journal = {{Molecular Crystals and Liquid Crystals}}, number = {{1}}, pages = {{51--83}}, publisher = {{Informa UK Limited}}, title = {{{The Effect of Electric Fields on Blue Phases}}}, doi = {{10.1080/00268949108035659}}, volume = {{202}}, year = {{1991}}, } @misc{40640, author = {{Kitzerow, Heinz-Siegfried and Schmid, H. and Heppke, G.}}, booktitle = {{Labor 2000, Sonderausgabe der Zeitschrift LaborPraxis, Vogel Verlag, München}}, pages = {{6--11}}, title = {{{Chirale Flüssigkristalle - Selektive Reflexion in Phasen ohne Spiegelsymmetrie}}}, year = {{1991}}, } @article{42057, author = {{Huber, Klaus}}, issn = {{0021-9797}}, journal = {{Journal of Colloid and Interface Science}}, keywords = {{Colloid and Surface Chemistry, Surfaces, Coatings and Films, Biomaterials, Electronic, Optical and Magnetic Materials}}, number = {{2}}, pages = {{321--332}}, publisher = {{Elsevier BV}}, title = {{{Interactions in mixed interfaces of binary surfactant solutions}}}, doi = {{10.1016/0021-9797(91)90164-4}}, volume = {{147}}, year = {{1991}}, } @article{42056, author = {{Huber, Klaus}}, issn = {{0022-3654}}, journal = {{The Journal of Physical Chemistry}}, keywords = {{Physical and Theoretical Chemistry, General Engineering}}, number = {{38}}, pages = {{9825--9830}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Calcium-induced shrinking of polyacrylate chains in aqueous solution}}}, doi = {{10.1021/j100140a046}}, volume = {{97}}, year = {{1991}}, } @article{35390, author = {{Gochin, M. and Pines, A. and Rosen, M.E. and Rucker, S.P. and Schmidt, Claudia}}, issn = {{0026-8976}}, journal = {{Molecular Physics}}, keywords = {{Physical and Theoretical Chemistry, Condensed Matter Physics, Molecular Biology, Biophysics}}, number = {{4}}, pages = {{671--695}}, publisher = {{Informa UK Limited}}, title = {{{Two-dimensional N.M.R. studies of flexible molecules in liquid crystals: orientational order and conformational probabilities ofn-hexane}}}, doi = {{10.1080/00268979000100501}}, volume = {{69}}, year = {{1990}}, } @inproceedings{35391, author = {{Schmidt, Claudia and Rucker, S. R. and Caplan, D. and Quinton, M. F. and Pines, A.}}, booktitle = {{25th Congress Ampere on Magnetic Resonance and Related Phenomena}}, editor = {{Mehring, Michael and von Schütz, Jost Ulrich and Wolf, Hans Christoph}}, isbn = {{9783540531364}}, publisher = {{Springer Berlin Heidelberg}}, title = {{{NMR of Oriented Flexible Molecules}}}, doi = {{10.1007/978-3-642-76072-3}}, year = {{1990}}, } @article{40067, author = {{Heppke, G. and Kitzerow, Heinz-Siegfried and Lötzsch, D. and Papenfuß, Ch.}}, issn = {{0267-8292}}, journal = {{Liquid Crystals}}, keywords = {{Condensed Matter Physics, General Materials Science, General Chemistry}}, number = {{3}}, pages = {{407--418}}, publisher = {{Informa UK Limited}}, title = {{{Blue phase mixtures exhibiting low fractions of a chiral compound experimental observation of some unusual properties}}}, doi = {{10.1080/02678299008047356}}, volume = {{8}}, year = {{1990}}, } @article{40335, author = {{Kitzerow, Heinz-Siegfried and Crooker, P. P. and Kwok, S. L. and Xu, J. and Heppke, G.}}, issn = {{1050-2947}}, journal = {{Physical Review A}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{6}}, pages = {{3442--3448}}, publisher = {{American Physical Society (APS)}}, title = {{{Dynamics of blue-phase selective reflections in an electric field}}}, doi = {{10.1103/physreva.42.3442}}, volume = {{42}}, year = {{1990}}, } @article{40340, author = {{Kitzerow, Heinz-Siegfried and Crooker, P.P. and Kwok, S.L. and Heppke, G.}}, issn = {{0302-0738}}, journal = {{Journal de Physique}}, number = {{12}}, pages = {{1303--1312}}, publisher = {{EDP Sciences}}, title = {{{A blue phase with negative dielectric anisotropy in an electric field. Statics and dynamics}}}, doi = {{10.1051/jphys:0199000510120130300}}, volume = {{51}}, year = {{1990}}, } @article{40336, author = {{Kitzerow, Heinz-Siegfried and Heppke, G. and Schmid, H. and Jérôme, B. and Pieranski, P.}}, issn = {{0302-0738}}, journal = {{Journal de Physique}}, number = {{18}}, pages = {{2087--2099}}, publisher = {{EDP Sciences}}, title = {{{First optical observation of Kossel diagrams in chiral smectic phases}}}, doi = {{10.1051/jphys:0199000510180208700}}, volume = {{51}}, year = {{1990}}, }