@article{16106, author = {{Bartley, Tim and Donati, Gaia and Jin, Xian-Min and Datta, Animesh and Barbieri, Marco and Walmsley, Ian A.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, title = {{{Direct Observation of Sub-Binomial Light}}}, doi = {{10.1103/physrevlett.110.173602}}, year = {{2013}}, } @article{16107, author = {{Bartley, Tim and Crowley, Philip J. D. and Datta, Animesh and Nunn, Joshua and Zhang, Lijian and Walmsley, Ian}}, issn = {{1050-2947}}, journal = {{Physical Review A}}, title = {{{Strategies for enhancing quantum entanglement by local photon subtraction}}}, doi = {{10.1103/physreva.87.022313}}, year = {{2013}}, } @article{16108, author = {{Vidrighin, Mihai and Bartley, Tim and Donati, Gaia and Jin, Xian-Min and Barbieri, Marco and Kolthammer, W. Steven and Datta, Animesh and Walmsley, Ian A.}}, issn = {{2299-114X}}, journal = {{Quantum Measurements and Quantum Metrology}}, title = {{{Requirements for two-source entanglement concentration}}}, doi = {{10.2478/qmetro-2013-0002}}, year = {{2013}}, } @article{36296, author = {{Vogelsang, Christoph and Reinhold, Peter}}, journal = {{Zeitschrift für Didaktik der Naturwissenschaften}}, pages = {{103--128}}, title = {{{Zur Handlungsvalidität von Tests zum professionellen Wissen von Lehrkräften}}}, volume = {{19}}, year = {{2013}}, } @article{13520, abstract = {{Atomistic simulations in the framework of the density functional theory have been used to model morphologic and vibrational properties of lithium niobate–lithium tantalate mixed crystals as a function of the [Nb]/[Ta] ratio. Structural parameters such as the crystal volume and the lattice parameters a and c vary roughly linearly from LiTaO3 to LiNbO3, showing only minor deviations from the Vegard behavior. Our ab initio calculations demonstrate that the TO1, TO2 and TO4 vibrational modes become harder with increasing Nb concentration. TO3 becomes softer with increasing Nb content, instead. Furthermore, the investigated zone center A1 -TO phonon modes are characterized by a pronounced stoichiometry dependence. Frequency shifts as large as 30 cm−1 are expected as the [Nb]/[Ta] ratio grows from 0 to 1. Therefore, spectroscopic techniques sensitive to the A1 modes (such as Raman spectroscopy), can be employed for a direct and non-destructive determination of the crystal composition.}}, author = {{Sanna, Simone and Riefer, A. and Neufeld, Sergej and Schmidt, Wolf Gero and Berth, Gerhard and Rüsing, Michael and Widhalm, A. and Zrenner, Artur}}, issn = {{0015-0193}}, journal = {{Ferroelectrics}}, keywords = {{Ferroelectrics, vibrational properties, LiNbO3, LiTaO3, mixed crystals}}, number = {{1}}, pages = {{63--68}}, title = {{{Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals}}}, doi = {{10.1080/00150193.2013.821893}}, volume = {{447}}, year = {{2013}}, } @article{13524, author = {{Landmann, M. and Rauls, E. and Schmidt, Wolf Gero and Röppischer, Marcus and Cobet, Christoph and Esser, Norbert and Schupp, Thorsten and As, Donat J. and Feneberg, Martin and Goldhahn, Rüdiger}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{19}}, title = {{{Transition energies and direct-indirect band gap crossing in zinc-blende AlxGa1−xN}}}, doi = {{10.1103/physrevb.87.195210}}, volume = {{87}}, year = {{2013}}, } @article{47940, abstract = {{Copper oxide and cobalt oxide (CuO, Co3O4) nanocrystals (NCs) have been successfully prepared in a short time using microwave irradiation without any postannealing treatment. Both kinds of nanocrystals (NCs) have been prepared using copper nitrate and cobalt nitrate as the starting materials and distilled water as the solvent. The resulted powders of nanocrystals (NCs) were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM) measurements. The obtained results confirm the presence of the both of oxides nanopowders produced during chemical precipitation using microwave irradiation. A strong emission under UV excitation is obtained from the prepared CuO and Co3O4 nanoparticles. The results show that the nanoparticles have high dispersion and narrow size distribution. The line scans of atomic force microscopy (AFM) images of the nanocrystals (NCs) sprayed on GaAs substrates confirm the results of both X-ray diffraction and transmission electron microscopy. Furthermore, vibrational studies have been carried out using Raman spectroscopic technique. Specific Raman peaks have been observed in the CuO and Co3O4 nanostructures, and the full width at half maximum (FWHM) of the peaks indicates a small particle size of the nanocrystals.}}, author = {{Rashad, M. and Rüsing, Michael and Berth, Gerhard and Lischka, K. and Pawlis, A.}}, issn = {{1687-4129}}, journal = {{Journal of Nanomaterials}}, keywords = {{General Materials Science}}, pages = {{714853}}, publisher = {{Hindawi Limited}}, title = {{{CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy}}}, doi = {{10.1155/2013/714853}}, volume = {{2013}}, year = {{2013}}, } @article{31298, author = {{Barkhofen, Sonja and Weich, Tobias and Potzuweit, A. and Stöckmann, H.-J. and Kuhl, U. and Zworski, M.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{General Physics and Astronomy}}, number = {{16}}, publisher = {{American Physical Society (APS)}}, title = {{{Experimental Observation of the Spectral Gap in Microwave n-Disk Systems}}}, doi = {{10.1103/physrevlett.110.164102}}, volume = {{110}}, year = {{2013}}, } @inproceedings{38196, author = {{Hellmich, Frank and Blumberg, Eva}}, publisher = {{Technische Universität Braunschweig}}, title = {{{Qualität inklusiven Unterrichts in der Grundschule. Symposium auf der Tagung „Gemeinsam anders lehren und lernen – Wege in die inklusive Bildung“. Gemeinsame Jahrestagung der DGfE Kommission Grundschulforschung und Didaktik der Primarstufe und der DGfE Sektion Sonderpädagogik}}}, year = {{2013}}, } @article{39542, author = {{Shayovitz, Dror and Herrmann, Harald and Sohler, Wolfgang and Ricken, Raimund and Silberhorn, Christine and Marom, Dan M.}}, issn = {{0146-9592}}, journal = {{Optics Letters}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{22}}, publisher = {{The Optical Society}}, title = {{{Time-to-space conversion of ultrafast waveforms at 155  μm in a planar periodically poled lithium niobate waveguide}}}, doi = {{10.1364/ol.38.004708}}, volume = {{38}}, year = {{2013}}, } @article{39551, author = {{Herrmann, Harald and Yang, Xu and Thomas, Abu and Poppe, Andreas and Sohler, Wolfgang and Silberhorn, Christine}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{23}}, publisher = {{The Optical Society}}, title = {{{Post-selection free, integrated optical source of non-degenerate, polarization entangled photon pairs}}}, doi = {{10.1364/oe.21.027981}}, volume = {{21}}, year = {{2013}}, } @article{40163, author = {{Förtsch, Michael and Fürst, Josef U. and Wittmann, Christoffer and Strekalov, Dmitry and Aiello, Andrea and Chekhova, Maria V. and Silberhorn, Christine and Leuchs, Gerd and Marquardt, Christoph}}, issn = {{2041-1723}}, journal = {{Nature Communications}}, keywords = {{General Physics and Astronomy, General Biochemistry, Genetics and Molecular Biology, General Chemistry, Multidisciplinary}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{A versatile source of single photons for quantum information processing}}}, doi = {{10.1038/ncomms2838}}, volume = {{4}}, year = {{2013}}, } @article{39033, author = {{Rohde, Peter P. and Schreiber, Andreas and Štefaňák, Martin and Jex, Igor and Gilchrist, Alexei and Silberhorn, Christine}}, issn = {{1546-1955}}, journal = {{Journal of Computational and Theoretical Nanoscience}}, keywords = {{Electrical and Electronic Engineering, Computational Mathematics, Condensed Matter Physics, General Materials Science, General Chemistry}}, number = {{7}}, pages = {{1644--1652}}, publisher = {{American Scientific Publishers}}, title = {{{Increasing the Dimensionality of Quantum Walks Using Multiple Walkers}}}, doi = {{10.1166/jctn.2013.3104}}, volume = {{10}}, year = {{2013}}, } @article{40160, author = {{Kruse, R and Katzschmann, F and Christ, A and Schreiber, A and Wilhelm, S and Laiho, K and Gábris, A and Hamilton, C S and Jex, I and Silberhorn, Christine}}, issn = {{1367-2630}}, journal = {{New Journal of Physics}}, keywords = {{General Physics and Astronomy}}, number = {{8}}, publisher = {{IOP Publishing}}, title = {{{Spatio-spectral characteristics of parametric down-conversion in waveguide arrays}}}, doi = {{10.1088/1367-2630/15/8/083046}}, volume = {{15}}, year = {{2013}}, } @article{43254, abstract = {{A mechanism for creating a Newton's cradle (NC) in nonlinear light wave trains under the action of the third-order dispersion (TOD) is demonstrated. The formation of the NC structure plays an important role in the process of fission of higher-order (N) solitons in optical fibers. After the splitting of the initial N soliton into a nonuniform chain of fundamental quasisolitons, the tallest one travels along the entire chain, through consecutive collisions with other solitons, and then escapes, while the remaining chain of pulses stays as a bound state, due to the radiation-mediated interaction between them. Increasing the initial soliton's order, N, leads to the transmission through, and release of additional solitons with enhanced power, along with the emission of radiation, which may demonstrate a broadband supercontinuum spectrum. The NC dynamical regime remains robust in the presence of extra perturbations, such as the Raman and self-steepening effects, and dispersion terms above the third order. It is demonstrated that essentially the same NC mechanism is induced by the TOD in finite segments of periodic wave trains (in particular, soliton chains). A difference from the mechanical NC is that the TOD-driven pulse passing through the soliton array collects energy and momentum from other solitons. Thus, uniform and nonuniform arrays of nonlinear wave pulses offer an essential extension of the mechanical NC, in which the quasiparticles, unlike mechanical beads, interact inelastically, exchanging energy and generating radiation. Nevertheless, the characteristic phenomenology of NC chains may be clearly identified in these nonlinear-wave settings too.}}, author = {{Driben, R. and Malomed, B.A. and Yulin, A. V. and Skryabin, D.V.}}, journal = {{Physical Review A }}, number = {{6}}, title = {{{Newton's cradles in optics: From N-soliton fission to soliton chains}}}, doi = {{10.1103/PhysRevA.87.063808}}, volume = {{87}}, year = {{2013}}, } @article{43256, abstract = {{We considered the modulational instability of continuous-wave backgrounds, and the related generation and evolution of deterministic rogue waves in the recently introduced parity–time (P T)-symmetric system of linearly coupled nonlinear Schrödinger equations, which describes a Kerr-nonlinear optical coupler with mutually balanced gain and loss in its cores. Besides the linear coupling, the overlapping cores are coupled through the cross-phase-modulation term too. While the rogue waves, built according to the pattern of the Peregrine soliton, are (quite naturally) unstable, we demonstrate that the focusing cross-phase-modulation interaction results in their partial stabilization. For P T-symmetric and antisymmetric bright solitons, the stability region is found too, in an exact analytical form, and verified by means of direct simulations}}, author = {{Bludov, Y.V. and Driben, R. and Konotop, V.V. and Malomed, B.A.}}, journal = {{Journal of Optics}}, number = {{6}}, title = {{{Instabilities, solitons and rogue waves in PT-coupled nonlinear waveguides}}}, doi = {{10.1088/2040-8978/15/6/064010}}, volume = {{15}}, year = {{2013}}, } @article{43252, abstract = {{Optimization of the compression of input 𝑁 -solitons into robust ultra-narrow fundamental solitons, with a tunable up- or downshifted frequency, is proposed in photonic crystal fibers free of the Raman effect. Due to the absence of the Raman self-frequency shift, these fundamental solitons continue propagation, maintaining the acquired frequency, once separated from the input 𝑁 soliton’s temporal slot. A universal optimal value of the relative strength of the third-order dispersion is found, providing the strongest compression of the fundamental soliton is found. It depends only on the order of the injected 𝑁 -soliton. The largest compression degree significantly exceeds the analytical prediction supplied by the Satsuma–Yajima formula. The mechanism behind this effect, which remains valid in the presence of the self-steepening, is explained.}}, author = {{Driben, R. and Malomed, B.A.}}, journal = {{Optics Letters}}, number = {{18}}, pages = {{3623--3626}}, title = {{{Generation of tightly compressed solitons with a tunable frequency shift in Raman-free fibers}}}, doi = {{10.1364/OL.38.003623}}, volume = {{38}}, year = {{2013}}, } @article{43253, abstract = {{We demonstrate that the fission of higher-order N-solitons with a subsequent ejection of fundamental quasi-solitons creates cavities formed by a pair of solitary waves with dispersive light trapped between them. As a result of multiple reflections of the trapped light from the bounding solitons which act as mirrors, they bend their trajectories and collide. In the spectral domain, the two solitons receive blue and red wavelength shifts, and the spectrum of the trapped light alters as well. This phenomenon strongly affects spectral characteristics of the generated supercontinuum. Consideration of the system's parameters which affect the creation of the cavity reveals possibilities of predicting and controlling soliton-soliton collisions induced by multiple reflections of the trapped light.}}, author = {{Driben, R. and Yulin, A. V. and Efimov, A. and Malomed, B.A.}}, journal = {{Optics Express}}, number = {{16}}, pages = {{19091--19096}}, title = {{{Trapping of light in solitonic cavities and its role in the supercontinuum generation}}}, doi = {{10.1364/OE.21.019091}}, volume = {{21}}, year = {{2013}}, } @article{43255, abstract = {{By means of direct simulations and theoretical analysis, we study the nonlinear propagation of truncated Airy pulses in an optical fiber exhibiting both anomalous second-order and strong positive third-order dispersions (TOD). It is found that the Airy pulse first reaches a finite-size focal area as determined by the relative strength of the two dispersion terms, and then undergoes an inversion transformation such that it continues to travel with an opposite acceleration. The system notably features tight focusing if the TOD is a dominant factor. These effects are partially reduced by Kerr nonlinearity.}}, author = {{Driben, R. and Hu, Y. and Chen, Z. and Malomed, B.A. and Morandotti, R.}}, journal = {{Optics Letters}}, number = {{14}}, pages = {{2499--2501}}, title = {{{Inversion and tight focusing of Airy pulses under the action of third-order dispersion}}}, doi = {{10.1364/OL.38.002499}}, volume = {{38}}, year = {{2013}}, } @article{43258, abstract = {{We consider an effectively one-dimensional binary Bose-Einstein condensate (BEC) with nonlinear repulsive interactions and linear spin-orbit (SO) and Zeeman-splitting couplings. In the presence of the trapping harmonic-oscillator (HO) potential, we report the existence of even, odd, and asymmetric spatial modes. They feature alternating domains with opposite directions of the pseudospin, i.e., antiferromagnetic structures, which is explained by the interplay of the linear couplings, HO confinement, and repulsive self-interaction. The number of the domains is determined by the strength of the SO coupling. The modes are constructed analytically in the weakly nonlinear system. The dynamical stability of the modes is investigated by means of the Bogoliubov–de Gennes equations and direct simulations. A notable result is that the multi-domain-wall (DW) structures are stable, alternating between odd and even shapes, while the simplest single-DW structure is unstable. Thus, the system features a transition to the complex ground states under the action of the SO coupling. The addition of the Zeeman splitting transforms the odd modes into asymmetric ones via spontaneous symmetry breaking. The results suggest possibilities for switching the binary system between states with opposite (pseudo)magnetization by external fields, and realization of similar stable states and dynamical effects in solid-state and nonlinear-optical settings emulated by the SO-coupled BECs.}}, author = {{Zezyulin, D.A. and Driben, R. and Konotop, V.V. and Malomed, B.A.}}, journal = {{Physical Review A }}, number = {{1}}, title = {{{Nonlinear modes in binary bosonic condensates with pseudo–spin-orbital coupling}}}, doi = {{10.1103/PhysRevA.88.013607}}, volume = {{88}}, year = {{2013}}, }