@article{10026, abstract = {{Congruent lithium niobate and lithium tantalate mixed crystals have been grown over the complete compositional range with the Czochralski method. The structural and vibrational properties of the mixed crystals are studied extensively by x-ray diffraction measurements, Raman spectroscopy, and density functional theory. The measured lattice parameters and vibrational frequencies are in good agreement with our theoretical predictions. The observed dependence of the Raman frequencies on the crystal composition is discussed on the basis of the calculated phonon displacement patterns. The phononic contribution to the static dielectric tensor is calculated by means of the generalized Lyddane-Sachs-Teller relation. Due to the pronounced dependence of the optical response on the Ta concentration, lithium niobate tantalate mixed crystals represent a perfect model system to study the properties of uniaxial mixed ferroelectric materials for application in integrated optics.}}, author = {{Rüsing, Michael and Sanna, Simone and Neufeld, Sergej and Berth, Gerhard and Schmidt, Wolf Gero and Zrenner, Artur and Yu, H. and Wang, Y. and Zhang, H.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, title = {{{Vibrational properties of LiNb1−xTaxO3 mixed crystals}}}, doi = {{10.1103/physrevb.93.184305}}, year = {{2016}}, } @article{9268, author = {{Harder, Georg and Bartley, Tim and Lita, Adriana E. and Nam, Sae Woo and Gerrits, Thomas and Silberhorn, Christine}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, title = {{{Single-Mode Parametric-Down-Conversion States with 50 Photons as a Source for Mesoscopic Quantum Optics}}}, doi = {{10.1103/physrevlett.116.143601}}, year = {{2016}}, } @inproceedings{37803, author = {{Blumberg, Eva and Fromme, Theresa and Hellmich, Frank}}, publisher = {{Freie Universität Berlin}}, title = {{{Förderung inklusiven Lernens im naturwissenschaftlich-technischen Sachunterricht der Grundschule. Vortrag auf der 4. Jahrestagung der Gesellschaft für Empirische Bildungsforschung (GEBF)}}}, year = {{2016}}, } @article{38061, author = {{Schleich, Wolfgang P. and Ranade, Kedar S. and Anton, Christian and Arndt, Markus and Aspelmeyer, Markus and Bayer, Manfred and Berg, Gunnar and Calarco, Tommaso and Fuchs, Harald and Giacobino, Elisabeth and Grassl, Markus and Hänggi, Peter and Heckl, Wolfgang M. and Hertel, Ingolf-Volker and Huelga, Susana and Jelezko, Fedor and Keimer, Bernhard and Kotthaus, Jörg P. and Leuchs, Gerd and Lütkenhaus, Norbert and Maurer, Ueli and Pfau, Tilman and Plenio, Martin B. and Rasel, Ernst Maria and Renn, Ortwin and Silberhorn, Christine and Schiedmayer, Jörg and Schmitt-Landsiedel, Doris and Schönhammer, Kurt and Ustinov, Alexey and Walther, Philip and Weinfurter, Harald and Welzl, Emo and Wiesendanger, Roland and Wolf, Stefan and Zeilinger, Anton and Zoller, Peter}}, issn = {{0946-2171}}, journal = {{Applied Physics B}}, keywords = {{General Physics and Astronomy, Physics and Astronomy (miscellaneous), General Engineering}}, number = {{5}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Quantum technology: from research to application}}}, doi = {{10.1007/s00340-016-6353-8}}, volume = {{122}}, year = {{2016}}, } @article{38068, author = {{Szemendera, L. and Darré, P. and Baudoin, R. and Grossard, L. and Delage, L. and Herrmann, Harald and Silberhorn, Christine and Reynaud, F.}}, issn = {{0035-8711}}, journal = {{Monthly Notices of the Royal Astronomical Society}}, keywords = {{Space and Planetary Science, Astronomy and Astrophysics}}, number = {{3}}, pages = {{3115--3118}}, publisher = {{Oxford University Press (OUP)}}, title = {{{In-lab ALOHA mid-infrared up-conversion interferometer with high fringe contrast @λ = 3.39 μm}}}, doi = {{10.1093/mnras/stw196}}, volume = {{457}}, year = {{2016}}, } @article{38071, author = {{Harder, G. and Silberhorn, Christine and Rehacek, J. and Hradil, Z. and Motka, L. and Stoklasa, B. and Sánchez-Soto, L. L.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{General Physics and Astronomy}}, number = {{13}}, publisher = {{American Physical Society (APS)}}, title = {{{Local Sampling of the Wigner Function at Telecom Wavelength with Loss-Tolerant Detection of Photon Statistics}}}, doi = {{10.1103/physrevlett.116.133601}}, volume = {{116}}, year = {{2016}}, } @article{13917, abstract = {{We present the synthesis of indium oxide (In2O3) inverse opal films with photonic stop bands in the visible range by a structure replication method. Artificial opal films made of poly(methyl methacrylate) (PMMA) spheres are utilized as template. The opal films are deposited via sedimentation facilitated by ultrasonication, and then impregnated by indium nitrate solution, which is thermally converted to In2O3 after drying. The quality of the resulting inverse opal film depends on many parameters; in this study the water content of the indium nitrate/PMMA composite after drying is investigated. Comparison of the reflectance spectra recorded by vis-spectroscopy with simulated data shows a good agreement between the peak position and calculated stop band positions for the inverse opals. This synthesis is less complex and highly efficient compared to most other techniques and is suitable for use in many applications.}}, author = {{Amrehn, Sabrina and Berghoff, Daniel and Nikitin, Andreas and Reichelt, Matthias and Wu, Xia and Meier, Torsten and Wagner, Thorsten}}, issn = {{1569-4410}}, journal = {{Photonics and Nanostructures - Fundamentals and Applications}}, pages = {{55--63}}, title = {{{Indium oxide inverse opal films synthesized by structure replication method}}}, doi = {{10.1016/j.photonics.2016.02.005}}, volume = {{19}}, year = {{2016}}, } @article{13915, abstract = {{The dynamics of a pair of harmonic oscillators represented by three-dimensional fields coupled with a repulsive cubic nonlinearity is investigated through direct simulations of the respective field equations and with the help of the finite-mode Galerkin approximation (GA), which represents the two interacting fields by a superposition of 3+3 harmonic-oscillator p-wave eigenfunctions with orbital and magnetic quantum numbers l=1 and m=1, 0, −1. The system can be implemented in binary Bose-Einstein condensates, demonstrating the potential of the atomic condensates to emulate various complex modes predicted by classical field theories. First, the GA very accurately predicts a broadly degenerate set of the system's ground states in the p-wave manifold, in the form of complexes built of a dipole coaxial with another dipole or vortex, as well as complexes built of mutually orthogonal dipoles. Next, pairs of noncoaxial vortices and/or dipoles, including pairs of mutually perpendicular vortices, develop remarkably stable dynamical regimes, which feature periodic exchange of the angular momentum and periodic switching between dipoles and vortices. For a moderately strong nonlinearity, simulations of the coupled-field equations agree very well with results produced by the GA, demonstrating that the dynamics is accurately spanned by the set of six modes limited to l=1.}}, author = {{Driben, R. and Konotop, V. V. and Malomed, B. A. and Meier, Torsten}}, issn = {{2470-0045}}, journal = {{Physical Review E}}, number = {{1}}, title = {{{Dynamics of dipoles and vortices in nonlinearly coupled three-dimensional field oscillators}}}, doi = {{10.1103/physreve.94.012207}}, volume = {{94}}, year = {{2016}}, } @inproceedings{13918, author = {{Podzimski, Reinold and Duc, Huynh Thanh and Priyadarshi, Shekhar and Schmidt, Christian and Bieler, Mark and Meier, Torsten}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XX}}, editor = {{Betz, Markus and Elezzabi, Abdulhakem Y.}}, publisher = {{SPIE}}, title = {{{Photocurrents in semiconductors and semiconductor quantum wells analyzed by k.p-based Bloch equations}}}, doi = {{10.1117/12.2208572}}, volume = {{9746}}, year = {{2016}}, } @article{22942, abstract = {{A microscopic approach that is based on the multisubband semiconductor Bloch equations formulated in the basis of a 14-band k⋅p model is employed to compute the temporal dynamics of photocurrents in GaAs quantum wells following excitation with femtosecond laser pulses. This approach provides a transparent description of the interband, intersubband, and intraband excitations, fully includes all resonant as well as off-resonant excitations, and treats the light-matter interaction nonperturbatively. For linearly polarized excitations, the photocurrents contain contributions from shift and rectification currents. We numerically compute and analyze these currents generated by excitation with femtosecond laser pulses for [110]- and [111]-oriented GaAs quantum wells. It is shown that the often employed perturbative χ(2) approach breaks down for peak fields larger than about 10 kV/cm, and that nonperturbative effects lead to a reduction of the peak values of the shift and rectification currents and to temporal oscillations that originate from Rabi flopping. In particular, we find a complex oscillatory photon energy dependence of the magnitudes of the shift and rectification currents. Our simulations demonstrate that this dependence is the result of mixing between the heavy- and light-hole valence bands. This is a surprising finding since the band mixing has an even larger influence on the strength of the photocurrents than the absorption coefficient. For [110]-oriented GaAs quantum wells, the calculated photon energy dependence is compared to experimental results, and good agreement is obtained. This validates our theoretical approach.}}, author = {{Duc, Huynh Thanh and Podzimski, Reinold and Priyadarshi, Shekhar and Bieler, Mark and Meier, Torsten}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{8}}, publisher = {{American Physical Society}}, title = {{{Ultrafast shift and rectification photocurrents in GaAs quantum wells: Excitation intensity dependence and the importance of band mixing}}}, doi = {{10.1103/physrevb.94.085305}}, volume = {{94}}, year = {{2016}}, } @article{13916, abstract = {{Nonlinearity is the driving force for numerous important effects in nature typically showing transitions between different regimes, regular, chaotic or catastrophic behavior. Localized nonlinear modes have been the focus of intense research in areas such as fluid and gas dynamics, photonics, atomic and solid state physics etc. Due to the richness of the behavior of nonlinear systems and due to the severe numerical demands of accurate three-dimensional (3D) numerical simulations presently only little knowledge is available on the dynamics of complex nonlinear modes in 3D. Here, we investigate the dynamics of 3D non-coaxial matter wave vortices that are trapped in a parabolic potential and interact via a repulsive nonlinearity. Our numerical simulations demonstrate the existence of an unexpected and fascinating nonlinear regime that starts immediately when the nonlinearity is switched-on and is characterized by a smooth dynamics representing torque-free precession with nutations. The reported motion is proven to be robust regarding various effects such as the number of particles, dissipation and trap deformations and thus should be observable in suitably designed experiments. Since our theoretical approach, i.e., coupled nonlinear Schrödinger equations, is quite generic, we expect that the obtained novel dynamical behavior should also exist in other nonlinear systems.}}, author = {{Driben, R. and Konotop, V. V. and Meier, Torsten}}, issn = {{2045-2322}}, journal = {{Scientific Reports}}, title = {{{Precession and nutation dynamics of nonlinearly coupled non-coaxial three-dimensional matter wave vortices}}}, doi = {{10.1038/srep22758}}, volume = {{6}}, year = {{2016}}, } @article{13920, abstract = {{We investigate the transient optical response in high-quality Cd0.88Zn0.12Te crystals in the regime of slow light propagation on the lower exciton-polariton branch. Femtosecond photoexcitation leads to very substantial transmission changes in a ∼10-meV broad spectral range within the transparency window of the unexcited semiconductor. These nonlinear optical signatures decay on picosecond time scales governed by carrier thermalization and recombination. The temporal and spectral dependence indicate the dynamical optical response as arising from excitation-induced dephasing and perturbed free induction decay. Model simulations for the optical response taking into account the actual exciton-polariton dispersion and excitation-induced dephasing of a nonlinearly driven two-level system support this interpretation.}}, author = {{Lohrenz, J. and Melzer, S. and Ruppert, C. and Akimov, I. A. and Mariette, H. and Reichelt, Matthias and Trautmann, Alexander and Meier, Torsten and Betz, M.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{7}}, title = {{{Ultrafast dynamical response of the lower exciton-polariton branch in CdZnTe}}}, doi = {{10.1103/physrevb.93.075201}}, volume = {{93}}, year = {{2016}}, } @inbook{45496, author = {{Vogelsang, Christoph and Borowski, Andreas and Fischer, Hans E. and Kulgemeyer, Christoph and Reinhold, Peter and Riese, Josef and Schecker, Horst}}, booktitle = {{Modeling and Measuring Competencies in Higher Education – Validation and Methodological Innovations (KoKoHs) – Overview of the Research Projects (KoKoHs Working Papers, 11)}}, editor = {{Pant, Hans Anand and Zlatkin-Troitschanskaia , Olga and Lautenbach, Corinna and Toepper, Miriam and Molerov, Dimitar}}, pages = {{35--38}}, title = {{{ProfiLe-P+ – Professional Competence in Academic Physics Teacher Education}}}, year = {{2016}}, } @inproceedings{45548, author = {{Riese, Josef and Gramzow, Yvonne and Reinhold, Peter}}, booktitle = {{Authentizität und Lernen - das Fach in der Fachdidaktik. Gesellschaft für Didaktik der Chemie und Physik. Jahrestagung in Berlin 2015}}, editor = {{Maurer, Christian}}, pages = {{187--189}}, title = {{{Analysen zum fachdidaktischen Wissen von angehenden Physiklehrkräften}}}, year = {{2016}}, } @inbook{45499, author = {{Vogelsang, Christoph and Borowski, Andreas and Fischer, Hans E. and Kulgemeyer, Christoph and Reinhold, Peter and Riese, Josef and Schecker, Horst}}, booktitle = {{Kompetenzmodelle und Instrumente der Kompetenzerfassung im Hochschulsektor – Validierungen und methodische Innovationen (KoKoHs): Übersicht der Forschungsprojekte (KoKoHs Working Papers, 10)}}, editor = {{Zlatkin-Troitschanskaia, Olga and Pant, Hans Anand and Lautenbach, Corinna and Toepper, Miriam}}, pages = {{39--43}}, title = {{{ProfiLe- P+ – Professionskompetenz im Lehramtsstudium Physik}}}, year = {{2016}}, } @inproceedings{45500, author = {{Woitkowski, David and Riese, Josef and Reinhold, Peter}}, booktitle = {{Authentizität und Lernen - das Fach in der Fachdidaktik. Gesellschaft für Didaktik der Chemie und Physik. Jahrestagung in Berlin 2015}}, editor = {{Maurer, Christian}}, pages = {{179--181}}, title = {{{Konstruktion von Niveaus des fachlichen Wissens Physik}}}, year = {{2016}}, } @article{1454, author = {{Grynko, Yevgen and Zentgraf, Thomas and Meier, Torsten and Förstner, Jens}}, issn = {{0946-2171}}, journal = {{Applied Physics B}}, keywords = {{tet_topic_meta, tet_topic_shg}}, number = {{9}}, pages = {{242}}, publisher = {{Springer Nature}}, title = {{{Simulations of high harmonic generation from plasmonic nanoparticles in the terahertz region}}}, doi = {{10.1007/s00340-016-6510-0}}, volume = {{122}}, year = {{2016}}, } @article{1456, author = {{Ye, Weimin and Zeuner, Franziska and Li, Xin and Reineke, Bernhard and He, Shan and Qiu, Cheng-Wei and Liu, Juan and Wang, Yongtian and Zhang, Shuang and Zentgraf, Thomas}}, issn = {{2041-1723}}, journal = {{Nature Communications}}, publisher = {{Springer Nature}}, title = {{{Spin and wavelength multiplexed nonlinear metasurface holography}}}, doi = {{10.1038/ncomms11930}}, volume = {{7}}, year = {{2016}}, } @article{1459, author = {{Chen, Shumei and Zeuner, Franziska and Weismann, Martin and Reineke, Bernhard and Li, Guixin and Valev, Ventsislav Kolev and Cheah, Kok Wai and Panoiu, Nicolae Coriolan and Zentgraf, Thomas and Zhang, Shuang}}, issn = {{0935-9648}}, journal = {{Advanced Materials}}, number = {{15}}, pages = {{2992--2999}}, publisher = {{Wiley-Blackwell}}, title = {{{Giant Nonlinear Optical Activity of Achiral Origin in Planar Metasurfaces with Quadratic and Cubic Nonlinearities}}}, doi = {{10.1002/adma.201505640}}, volume = {{28}}, year = {{2016}}, } @article{1457, author = {{Li, Guixin and Zentgraf, Thomas and Zhang, Shuang}}, issn = {{1745-2473}}, journal = {{Nature Physics}}, number = {{8}}, pages = {{736--740}}, publisher = {{Springer Nature}}, title = {{{Rotational Doppler effect in nonlinear optics}}}, doi = {{10.1038/nphys3699}}, volume = {{12}}, year = {{2016}}, }