@article{4547, abstract = {{The coherent state manipulation of single quantum systems is a fundamental requirement for the implementation of quantum information processors. Exciton qubits are of particular interest for coherent optoelectronic applications, in particular due to their excellent coupling to photons. Until now, coherent manipulations of exciton qubits in semiconductor quantum dots have been performed predominantly by pulsed laser fields. Coherent control of the population of excitonic states with a single laser pulse, observed by Rabi oscillations, has been demonstrated by several groups using different techniques1,2,3. By using two laser pulses, more general state control can be achieved4, and coupling of two excitons has been reported5,6. Here, we present a conceptually new approach for implementing the coherent control of an exciton two-level system (qubit) by means of a time-dependent electric interaction. The new scheme makes use of an optical clock signal and a synchronous electric gate signal, which controls the coherent manipulation.}}, author = {{Michaelis de Vasconcellos, S. and Gordon, S. and Bichler, M. and Meier, Torsten and Zrenner, Artur}}, issn = {{1749-4885}}, journal = {{Nature Photonics}}, number = {{8}}, pages = {{545--548}}, publisher = {{Springer Nature}}, title = {{{Coherent control of a single exciton qubit by optoelectronic manipulation}}}, doi = {{10.1038/nphoton.2010.124}}, volume = {{4}}, year = {{2010}}, } @article{4123, abstract = {{GaAs-based semiconductor microdisks with high quality whispering gallery modes (Q44000) have been fabricated.A layer of self-organized InAs quantumdots (QDs) served as a light source to feed the optical modes at room temperature. In order to achieve frequency tuning of the optical modes, the microdisk devices have been immersed in 4 – cyano – 4´-pentylbiphenyl (5CB), a liquid crystal(LC) with a nematic phase below the clearing temperature of TC≈34°C .We have studied the device performance in the temperature rangeof T=20-50°C, in order to investigate the influence of the nematic–isotropic phase transition on the optical modes. Moreover,we havea pplied an AC electric field to the device,which leads in the nematic phase to a reorientation of the anisotropic dielectric tensor of the liquid crystal.This electrical anisotropy can be used to achieve electrical tunability of the optical modes.Using the finite-difference time domain (FDTD) technique with an anisotropic material model, we are able to describe the influence of the liquid crystal qualitatively.}}, author = {{Piegdon, Karoline A. and Offer, Matthias and Lorke, Axel and Urbanski, Martin and Hoischen, Andreas and Kitzerow, Heinz-Siegfried and Declair, Stefan and Förstner, Jens and Meier, Torsten and Reuter, Dirk and Wieck, Andreas D. and Meier, Cedrik}}, issn = {{1386-9477}}, journal = {{Physica E: Low-dimensional Systems and Nanostructures}}, keywords = {{tet_topic_qd, tet_topic_microdisk}}, number = {{10}}, pages = {{2552--2555}}, publisher = {{Elsevier BV}}, title = {{{Self-assembled quantum dots in a liquid-crystal-tunable microdisk resonator}}}, doi = {{10.1016/j.physe.2009.12.051}}, volume = {{42}}, year = {{2010}}, } @article{4169, abstract = {{It is demonstrated that valence-band mixing in GaAs quantum wells tremendously modifies electronic transport. A coherent control scheme in which ultrafast currents are optically injected into undoped GaAs quantum wells upon excitation with femtosecond laser pulses is employed. An oscillatory dependence of the injection current amplitude and direction on the excitation photon energy is observed. A microscopic theoretical analysis shows that this current reversal is caused by the coupling of the light- and heavy-hole bands and that the hole currents dominate the overall current response. These surprising consequences of band mixing illuminate fundamental physics as they are unique for experiments which are able to monitor electronic transport resulting from carriers with relatively large momenta.}}, author = {{Priyadarshi, S. and Racu, A. M. and Pierz, K. and Siegner, U. and Bieler, M. and Duc, H. T. and Förstner, Jens and Meier, Torsten}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{tet_topic_qw}}, number = {{21}}, publisher = {{American Physical Society (APS)}}, title = {{{Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in Undoped GaAs Quantum Wells}}}, doi = {{10.1103/physrevlett.104.217401}}, volume = {{104}}, year = {{2010}}, } @inproceedings{4167, abstract = {{The electromagnetic field in the vicinity of sharp edges needs a special treatment in numeric calculation whenever accurate, fast converging results are necessary. One of the fundamental works concerning field singularities has been proposed in 1972 [1] and states that the electromagnetic energy density must be integrable over any finite domain, even if this domain contains singularities. It is shown, that the magnetic field H(, ϕ) and electric field E(, ϕ) are proportional to ∝ (t−1) for  → 0. The variable  is the distance to the edge and t has to fulfill the integrability condition and thus is restricted to 0 < t < 1. This result is often used to reduce the error corresponding to the singularity without increasing the numerical effort [2 - 5]. For this purpose, a correction factor K is estimated by inserting the proportionality into the wave equation. It is shown, that this method improves the accuracy of the result significantly, however the order of convergence is often not studied. In [4] a method to modify the material parameters in order to use analytic results to improve the numeric calculation is presented. In this contribution we will - inspired by the scheme given in [4] - develop a new method to estimate a correction factor for perfect conducting materials (PEC) and demonstrate the improvement of the results compared to the standard edge correction. Therefore analytic results (comparable to [1]) are consequently merged with the scheme in [4]. The main goal of this work is the calculation of the second harmonic generation (SHG) in the wave response of so-called metamaterials [6]. Frequently these structures contain sharp metallic edges with field singularities at the interfaces which have a strong impact on the SHG signals. Thus, an accurate simulation of singularities is highly important. However, the following approach can also be applied to many other setups, and one of them is shown in the example below.}}, author = {{Classen, C and Förstner, Jens and Meier, Torsten and Schuhmann, R}}, booktitle = {{2010 IEEE Antennas and Propagation Society International Symposium}}, isbn = {{9781424449675}}, keywords = {{tet_topic_numerics}}, location = {{Toronto, ON, Canada}}, publisher = {{IEEE}}, title = {{{Enhanced FDTD edge correction for nonlinear effects calculation}}}, doi = {{10.1109/aps.2010.5562017}}, year = {{2010}}, } @article{4172, abstract = {{Microdisks made from GaAs with embedded InAs quantum dots are immersed in the liquid crystal 4-cyano-4’-pentylbiphenyl (5CB). The quantum dots serve as emitters feeding the optical modes of the photonic cavity. By changing temperature, the liquid crystal undergoes a phase transition from the isotropic to the nematic state, which can be used as an effective tuning mechanism of the photonic modes of the cavity. In the nematic state, the uniaxial electrical anisotropy of the liquid crystal molecules can be exploited for orienting the material in an electric field, thus externally controlling the birefringence of the material. Using this effect, an electric field induced tuning of the modes is achieved. Numerical simulations using the finite-differences time-domain (FDTD) technique employing an anisotropic dielectric medium allow to understand the alignment of the liquid crystal molecules on the surface of the microdisk resonator.}}, author = {{Piegdon, Karoline A. and Declair, Stefan and Förstner, Jens and Meier, Torsten and Matthias, Heiner and Urbanski, Martin and Kitzerow, Heinz-Siegfried and Reuter, Dirk and Wieck, Andreas D. and Lorke, Axel and Meier, Cedrik}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_qd, tet_topic_microdisk}}, number = {{8}}, publisher = {{The Optical Society}}, title = {{{Tuning quantum-dot based photonic devices with liquid crystals}}}, doi = {{10.1364/oe.18.007946}}, volume = {{18}}, year = {{2010}}, } @book{57344, editor = {{Marchetti, Andreas and Demesmay, Claire}}, pages = {{289}}, publisher = {{Nomos}}, title = {{{Der Vertrag von Lissabon: Analyse und Bewertung}}}, volume = {{71}}, year = {{2010}}, } @article{57381, author = {{Bürgel, Christoph and Siepmann, Dirk}}, journal = {{Zeitschrift für Fremdsprachenforschung}}, number = {{2}}, pages = {{191--216}}, title = {{{Was können Französischlehrer und -lerner? Wortschatz- und Hörverstehenskom­peten­zen auf dem Prüfstand}}}, volume = {{21}}, year = {{2010}}, } @article{57380, author = {{Bürgel, Christoph}}, journal = {{ französisch heute 4}}, pages = {{171--177}}, title = {{{Apprendre à déchiffrer un texte – Ein Beitrag zur Förderung der Lesekompetenz}}}, year = {{2010}}, } @article{56053, author = {{Priesching, Nicole}}, journal = {{Annali di studi religiosi}}, pages = {{147–166}}, title = {{{Der Erste Kreuzzug als Pilgerfahrt: Eine Militarisierung der Wallfahrt oder eine Sakralisierung der Ritterschaft? Ein Beitrag zur Spiritualität der Kreuzfahrer}}}, volume = {{11}}, year = {{2010}}, } @inproceedings{57707, author = {{Jöllenbeck, Thomas and Neuhaus, Dorothee and Grebe, B}}, booktitle = {{Innovation in der Rehabilitation - Kommunikation und Vernetzung, DRV-Schriften}}, pages = {{352--354}}, publisher = {{Heenemann}}, title = {{{Schlüsselparameter zur Optimierung des Gangverhaltens in der Rehabilitation bei Patienten nach Knie und HüftTEP}}}, volume = {{88}}, year = {{2010}}, } @inproceedings{57709, author = {{Jöllenbeck, Thomas and Neuhaus, Dorothee and Beck, K and Wojtowicz, S and Röckel, M}}, booktitle = {{Proceedings of the 28th Conference of the International Society of Biomechanics in Sports}}, editor = {{Jensen, W and Ebben, W and Petushek, E and Richter, C and Roemer, K}}, pages = {{311--314}}, publisher = {{Northern Michigan University Press}}, title = {{{Screening Test for the Potential Risk of ACL Rupture of Female and Male Soccer Players}}}, year = {{2010}}, } @inproceedings{56552, author = {{Turhan, Anni-Yasmin}}, booktitle = {{Reasoning Web. Semantic Technologies for Software Engineering, 6th International Summer School 2010, Dresden, Germany, August 30 - September 3, 2010. Tutorial Lectures}}, editor = {{Aßmann, Uwe and Bartho, Andreas and Wende, Christian}}, pages = {{1–27}}, publisher = {{Springer}}, title = {{{Reasoning and Explanation in 𝓔𝓛 and in Expressive Description Logics}}}, doi = {{10.1007/978-3-642-15543-7_1}}, volume = {{6325}}, year = {{2010}}, } @inbook{57786, author = {{Langer, Antje and Friebertshäuser, Barbara}}, booktitle = {{(An)Passungen. Körperlichkeit und Beziehungen in der Schule – ethnographische Studien. }}, editor = {{Langer, Antje and Richter, Sophia and Friebertshäuser, Barbara }}, isbn = {{978-3-8340-0675-2}}, pages = {{235--249}}, publisher = {{Schneider-Verlag Hohengehren}}, title = {{{Forschung und Lehre als „forschendes Lernen“. Plädoyer für studentische Forschungsprojekte.}}}, year = {{2010}}, } @inbook{57787, author = {{Langer, Antje and Richter, Sophia and Friebertshäuser, Barbara}}, booktitle = {{(An)Passungen. Körperlichkeit und Beziehungen in der Schule – ethnographische Studien.}}, editor = {{Langer, Antje and Richter, Sophia and Friebertshäuser, Barbara }}, isbn = {{978-3-8340-0675-2}}, pages = {{9--19}}, publisher = {{Schneider-Verlag Hohengehren}}, title = {{{Körperlichkeit und Beziehungen in der Schule – eine Einführung.}}}, year = {{2010}}, } @inbook{57783, author = {{Langer, Antje}}, booktitle = {{(An)Passungen. Körper¬lichkeit und Bezie¬hungen in der Schule – ethnographische Studien.}}, editor = {{Langer, Antje and Richter, Sophia and Friebertshäuser, Barbara}}, pages = {{87--116}}, publisher = {{Schneider-Verlag Hohengehren}}, title = {{{Körperlicher Bezug als Instrument pädagogischer Beziehungsarbeit}}}, year = {{2010}}, } @inbook{57788, author = {{Langer, Antje and Wrana, Daniel}}, booktitle = {{Handbuch Qualitative Forschungs¬methoden in der Erziehungswissenschaft. }}, editor = {{Friebertshäuser, Barbara and Langer, Antje and Prengel, Annedore}}, isbn = {{ 978-3-7799-0793-0}}, pages = {{335--349}}, publisher = {{Juventa}}, title = {{{Diskursforschung und Diskursanalysen.}}}, year = {{2010}}, } @inbook{57785, author = {{Langer, Antje}}, booktitle = {{Handbuch Qualitative Forschungsmethoden in der Erziehungswissenschaft (Neuauflage). }}, editor = {{Friebertshäuser, Barbara and Langer, Antje and Prengel, Annedore }}, isbn = {{978-3-7799-0793-0}}, pages = {{515--526}}, publisher = {{Juventa}}, title = {{{Transkribieren – Grundlagen und Regeln.}}}, year = {{2010}}, } @article{45169, author = {{Denkinger, M.D. and Franke, Sebastian and Rapp, K. and Weinmayr, G. and Duran-Tauleria, E. and Nikolaus, T. and Peter, R.}}, journal = {{BMC Geriatrics}}, number = {{50}}, title = {{{(for ActiFE Ulm Study Group). Accelerometer-based physical activity in a large observational cohort - study protocol and design of the Activity and Function of the Elderly in Ulm (ActiFE Ulm) study}}}, doi = {{10.1186/1471-2318-10-50}}, volume = {{10}}, year = {{2010}}, } @article{45170, author = {{Hennemann, T. and Hillenbrand, C. and Wilbert, J. and Franke, Sebastian and Spieß, R. and Jürgens, J. and Görgens, G.}}, journal = {{Empirische Sonderpädagogik}}, pages = {{36--49}}, title = {{{Kompetenzen und Risiken in der Transition in die Hauptschule – eine Querschnittsuntersuchung von Schülerinnen und Schülern der 5. Jahrgangsstufen}}}, doi = {{10.25656/01:9353}}, volume = {{4}}, year = {{2010}}, } @article{45168, author = {{Denkinger, M.D. and Igl, W. and Lukas, A. and Bader, A. and Bailer, S. and Franke, Sebastian and Denkinger, C.M. and Nikolaus, T. and Jamour, M.}}, journal = {{Journal of the American Geriatric Society}}, number = {{4}}, pages = {{664--673}}, title = {{{Relationship between fear of falling and outcomes of an inpatient geriatric rehabilitation population - fear the fear of falling}}}, volume = {{58}}, year = {{2010}}, }