@article{4136, abstract = {{Results of atomistic simulations aimed at understanding precipitation of the highly attractive wide band gap semiconductor material silicon carbide in silicon are presented. The study involves a systematic investigation of intrinsic and carbon-related defects as well as defect combinations and defect migration by both, quantummechanical first-principles as well as empirical potential methods. Comparing formation and activation energies, ground-state structures of defects and defect combinations as well as energetically favorable agglomeration of defects are predicted. Moreover, accurate ab initio calculations unveil limitations of the analytical method based on a Tersoff-like bond order potential. A work-around is proposed in order to subsequently apply the highly efficient technique on large structures not accessible by first-principles methods. The outcome of both types of simulation provides a basic microscopic understanding of defect formation and structural evolution particularly at non-equilibrium conditions strongly deviated from the ground state as commonly found in SiC growth processes. A possible precipitation mechanism, which conforms well to experimental findings and clarifies contradictory views present in the literature is outlined.}}, author = {{Zirkelbach, F. and Stritzker, B. and Nordlund, K. and Schmidt, Wolf Gero and Rauls, E. and Lindner, Jörg K. N.}}, issn = {{1862-6351}}, journal = {{physica status solidi (c)}}, number = {{10-11}}, pages = {{1968--1973}}, publisher = {{Wiley}}, title = {{{First-principles and empirical potential simulation study of intrinsic and carbon-related defects in silicon}}}, doi = {{10.1002/pssc.201200198}}, volume = {{9}}, year = {{2012}}, } @article{3972, abstract = {{Using a finite-difference time-domain method, we theoretically investigate the optical spectra of crossing perpendicular photonic crystal waveguides with quantum dots embedded in the central rod. The waveguides are designed so that the light mainly propagates along one direction and the cross talk is greatly reduced in the transverse direction. It is shown that when a quantum dot (QD) is resonant with the cavity, strong coupling can be observed via both the transmission and crosstalk spectrum. If the cavity is far off-resonant from the QD, both the cavity mode and the QD signal can be detected in the transverse direction since the laser field is greatly suppressed in this direction. This structure could have strong implications for resonant excitation and in-plane detection of QD optical spectroscopy.}}, author = {{Song, Xiaohong and Declair, Stefan and Meier, Torsten and Zrenner, Artur and Förstner, Jens}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_phc, tet_topic_qd}}, number = {{13}}, pages = {{14130--14136}}, publisher = {{The Optical Society}}, title = {{{Photonic crystal waveguides intersection for resonant quantum dot optical spectroscopy detection}}}, doi = {{10.1364/oe.20.014130}}, volume = {{20}}, year = {{2012}}, } @inproceedings{3967, abstract = {{We simulate the linear and nonlinear optical response from split-ring resonator (SRR) arrays to study collective effects between the constituent SRRs that determine spectral properties of the second harmonic generation (SHG). We apply the Discontinuous Galerkin Time Domain (DGTD) method and the hydrodynamic Maxwell-Vlasov model to calculate the SHG emission. Our model is able to qualitatively reproduce and explain the non-monotonic dependence of the spectral SHG transmission measured experimentally for SRR arrays with different lattice constants}}, author = {{Grynko, Yevgen and Meier, Torsten and Linden, Stefan and Niesler, Fabian B. P. and Wegener, Martin and Förstner, Jens}}, keywords = {{tet_topic_meta, tet_topic_shg}}, location = {{Bad Honnef}}, number = {{1}}, pages = {{128--130}}, publisher = {{AIP Conference Proceedings}}, title = {{{Near-field coupling and second-harmonic generation in split-ring resonator arrays}}}, doi = {{10.1063/1.4750118}}, volume = {{1475}}, year = {{2012}}, } @article{3970, abstract = {{Optical experiments on second-harmonic generation from split-ring-resonator square arrays show a nonmonotonic dependence of the conversion efficiency on the lattice constant. This finding is interpreted in terms of a competition between dilution effects and linewidth or near-field changes due to interactions among the individual elements in the array.}}, author = {{Linden, S. and Niesler, F. B. P. and Förstner, Jens and Grynko, Yevgen and Meier, Torsten and Wegener, M.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{tet_topic_shg, tet_topic_meta}}, number = {{1}}, publisher = {{American Physical Society (APS)}}, title = {{{Collective Effects in Second-Harmonic Generation from Split-Ring-Resonator Arrays}}}, doi = {{10.1103/physrevlett.109.015502}}, volume = {{109}}, year = {{2012}}, } @article{43200, abstract = {{A novel adaptive approach to compute the eigenenergies and eigenfunctions of the two-particle (electron-hole) Schrödinger equation including Coulomb attraction is presented. As an example, we analyze the energetically lowest exciton state of a thin one-dimensional semiconductor quantum wire in the presence of disorder which arises from the non-smooth interface between the wire and surrounding material. The eigenvalues of the corresponding Schrödinger equation, i.e., the one-dimensional exciton Wannier equation with disorder, correspond to the energies of excitons in the quantum wire. The wavefunctions, in turn, provide information on the optical properties of the wire. We reformulate the problem of two interacting particles that both can move in one dimension as a stationary eigenvalue problem with two spacial dimensions in an appropriate weak form whose bilinear form is arranged to be symmetric, continuous, and coercive. The disorder of the wire is modelled by adding a potential in the Hamiltonian which is generated by normally distributed random numbers. The numerical solution of this problem is based on adaptive wavelets. Our scheme allows for a convergence proof of the resulting scheme together with complexity estimates. Numerical examples demonstrate the behavior of the smallest eigenvalue, the ground state energies of the exciton, together with the eigenstates depending on the strength and spatial correlation of disorder.}}, author = {{Meier, Torsten and Mollet, Christian and Kunoth, Angela}}, journal = {{Communications in Computational Physics}}, number = {{1}}, pages = {{21--47}}, publisher = {{Cambridge University Press}}, title = {{{Excitonic Eigenstates of Disordered Semiconductor Quantum Wires: Adaptive Wavelet Computation of Eigenvalues for the Electron-Hole Schrödinger Equation}}}, doi = {{10.4208/cicp.081011.260712a}}, volume = {{14}}, year = {{2012}}, } @article{21045, author = {{Brecht, Benjamin and Eckstein, Andreas and Christ, Andreas and Suche, Hubertus and Silberhorn, Christine}}, issn = {{1367-2630}}, journal = {{New Journal of Physics}}, title = {{{From quantum pulse gate to quantum pulse shaper—engineered frequency conversion in nonlinear optical waveguides}}}, doi = {{10.1088/1367-2630/13/6/065029}}, volume = {{13}}, year = {{2011}}, } @article{21046, author = {{Eckstein, Andreas and Brecht, Benjamin and Silberhorn, Christine}}, issn = {{1094-4087}}, journal = {{Optics Express}}, number = {{15}}, title = {{{A quantum pulse gate based on spectrally engineered sum frequency generation}}}, doi = {{10.1364/oe.19.013770}}, volume = {{19}}, year = {{2011}}, } @article{21047, author = {{Brecht, Benjamin and Eckstein, Andreas and Silberhorn, Christine}}, issn = {{1862-6351}}, journal = {{physica status solidi (c)}}, number = {{4}}, pages = {{1235--1238}}, title = {{{Controlling the correlations in frequency upconversion in PPLN and PPKTP waveguides}}}, doi = {{10.1002/pssc.201000872}}, volume = {{8}}, year = {{2011}}, } @article{1725, author = {{Liu, Ming and Yin, Xiaobo and Ulin-Avila, Erick and Geng, Baisong and Zentgraf, Thomas and Ju, Long and Wang, Feng and Zhang, Xiang}}, issn = {{0028-0836}}, journal = {{Nature}}, number = {{7349}}, pages = {{64--67}}, publisher = {{Springer Nature}}, title = {{{A graphene-based broadband optical modulator}}}, doi = {{10.1038/nature10067}}, volume = {{474}}, year = {{2011}}, } @article{1726, author = {{Utikal, Tobias and Zentgraf, Thomas and Paul, Thomas and Rockstuhl, Carsten and Lederer, Falk and Lippitz, Markus and Giessen, Harald}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{13}}, publisher = {{American Physical Society (APS)}}, title = {{{Towards the Origin of the Nonlinear Response in Hybrid Plasmonic Systems}}}, doi = {{10.1103/physrevlett.106.133901}}, volume = {{106}}, year = {{2011}}, } @article{1727, author = {{Valentine, Jason and Zhang, Shuang and Zentgraf, Thomas and Zhang, Xiang}}, issn = {{0018-9219}}, journal = {{Proceedings of the IEEE}}, number = {{10}}, pages = {{1682--1690}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Development of Bulk Optical Negative Index Fishnet Metamaterials: Achieving a Low-Loss and Broadband Response Through Coupling}}}, doi = {{10.1109/jproc.2010.2094593}}, volume = {{99}}, year = {{2011}}, } @article{1728, author = {{Zentgraf, Thomas and Liu, Yongmin and Mikkelsen, Maiken H. and Valentine, Jason and Zhang, Xiang}}, issn = {{1748-3387}}, journal = {{Nature Nanotechnology}}, number = {{3}}, pages = {{151--155}}, publisher = {{Springer Nature}}, title = {{{Plasmonic Luneburg and Eaton lenses}}}, doi = {{10.1038/nnano.2010.282}}, volume = {{6}}, year = {{2011}}, } @article{7697, author = {{Marquardt, B. and Beckel, A. and Lorke, A. and Wieck, A. D. and Reuter, Dirk and Geller, M.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{22}}, publisher = {{AIP Publishing}}, title = {{{The influence of charged InAs quantum dots on the conductance of a two-dimensional electron gas: Mobility vs. carrier concentration}}}, doi = {{10.1063/1.3665070}}, volume = {{99}}, year = {{2011}}, } @article{7698, author = {{Han, Jong E. and Fischer, Saskia F. and Buchholz, Sven S. and Kunze, Ulrich and Reuter, Dirk and Wieck, Andreas D. and Bird, Jonathan P.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{19}}, publisher = {{American Physical Society (APS)}}, title = {{{Many-body enhanced nonlinear conductance resonance in quantum channels}}}, doi = {{10.1103/physrevb.84.193302}}, volume = {{84}}, year = {{2011}}, } @article{7700, author = {{Chen, Y. S. and Reuter, Dirk and Wieck, A. D. and Bacher, G.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{16}}, publisher = {{American Physical Society (APS)}}, title = {{{Dynamic Nuclear Spin Resonance inn-GaAs}}}, doi = {{10.1103/physrevlett.107.167601}}, volume = {{107}}, year = {{2011}}, } @article{7701, author = {{Spatzek, S. and Greilich, A. and Economou, Sophia E. and Varwig, S. and Schwan, A. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Reinecke, T. L. and Bayer, M.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{13}}, publisher = {{American Physical Society (APS)}}, title = {{{Optical Control of Coherent Interactions between Electron Spins in InGaAs Quantum Dots}}}, doi = {{10.1103/physrevlett.107.137402}}, volume = {{107}}, year = {{2011}}, } @article{7702, author = {{Spatzek, S. and Varwig, S. and Glazov, M. M. and Yugova, I. A. and Schwan, A. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Bayer, M.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{11}}, publisher = {{American Physical Society (APS)}}, title = {{{Generation and detection of mode-locked spin coherence in (In,Ga)As/GaAs quantum dots by laser pulses of long duration}}}, doi = {{10.1103/physrevb.84.115309}}, volume = {{84}}, year = {{2011}}, } @article{7703, author = {{Notthoff, Christian and Reuter, Dirk and Wieck, Andreas D. and Lorke, Axel}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{3}}, publisher = {{American Physical Society (APS)}}, title = {{{Edge-induced magnetoplasmon excitation in a two-dimensional electron gas under quantum Hall conditions}}}, doi = {{10.1103/physrevb.84.035311}}, volume = {{84}}, year = {{2011}}, } @article{7704, author = {{Cherbunin, R. V. and Flisinski, K. and Gerlovin, I. Ya. and Ignatiev, I. V. and Kuznetsova, M. S. and Petrov, M. Yu. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Bayer, M.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{4}}, publisher = {{American Physical Society (APS)}}, title = {{{Resonant nuclear spin pumping in (In,Ga)As quantum dots}}}, doi = {{10.1103/physrevb.84.041304}}, volume = {{84}}, year = {{2011}}, } @article{7707, author = {{Schinner, G. J. and Schubert, E. and Stallhofer, M. P. and Kotthaus, J. P. and Schuh, D. and Rai, A. K. and Reuter, Dirk and Wieck, A. D. and Govorov, A. O.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{16}}, publisher = {{American Physical Society (APS)}}, title = {{{Electrostatically trapping indirect excitons in coupled InxGa1−xAs quantum wells}}}, doi = {{10.1103/physrevb.83.165308}}, volume = {{83}}, year = {{2011}}, }