@article{20773,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the coherent ensemble dynamics. Control of the echo emission time is mandatory for applications. Here, we propose a concept to reach this goal. In a two-pulse photon echo sequence, we apply an additional resonant control pulse with multiple of 2<jats:italic>π</jats:italic> area. Depending on its arrival time, the control slows down dephasing or rephasing of the exciton ensemble during its action. We demonstrate for self-assembled (In,Ga)As quantum dots that the photon echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses.</jats:p>}},
  author       = {{Kosarev, Alexander N. and Rose, Hendrik and Poltavtsev, Sergey V. and Reichelt, Matthias and Schneider, Christian and Kamp, Martin and Höfling, Sven and Bayer, Manfred and Meier, Torsten and Akimov, Ilya A.}},
  issn         = {{2399-3650}},
  journal      = {{Communications Physics}},
  number       = {{1}},
  title        = {{{Accurate photon echo timing by optical freezing of exciton dephasing and rephasing in quantum dots}}},
  doi          = {{10.1038/s42005-020-00491-2}},
  volume       = {{3}},
  year         = {{2020}},
}

@article{43747,
  abstract     = {{Vortices are topological objects representing the circular motion of a fluid. With their additional degree of freedom, the vorticity, they have been widely investigated in many physical systems and different materials for fundamental interest and for applications in data storage and information processing. Vortices have also been observed in non-equilibrium exciton-polariton condensates in planar semiconductor microcavities. There they appear spontaneously or can be created and pinned in space using ring-shaped optical excitation profiles. However, using the vortex state for information processing not only requires creation of a vortex but also efficient control over the vortex after its creation. Here we demonstrate a simple approach to control and switch a localized polariton vortex between opposite states. In our scheme, both the optical control of vorticity and its detection through the orbital angular momentum of the emitted light are implemented in a robust and practical manner.}},
  author       = {{Meier, Torsten and Ma, Xuekai and Berger, Bernd and Aßmann, Marc and Driben, Rodislav and Schneider, Christian and Höfling, Sven and Schumacher, Stefan}},
  journal      = {{Nature communications}},
  number       = {{1}},
  pages        = {{897}},
  publisher    = {{Nature Publishing Group UK}},
  title        = {{{Realization of all-optical vortex switching in exciton-polariton condensates}}},
  doi          = {{10.1038/s41467-020-14702-5}},
  volume       = {{11}},
  year         = {{2020}},
}

@inproceedings{20770,
  author       = {{Hannes, Wolf-Rüdiger and Meier, Torsten}},
  booktitle    = {{Ultrafast Phenomena and Nanophotonics XXIV}},
  editor       = {{Betz, Markus and Elezzabi, Abdulhakem Y.}},
  isbn         = {{9781510633193}},
  pages        = {{112780S}},
  title        = {{{k.p-based multiband simulations of non-degenerate two-photon absorption in bulk GaAs}}},
  doi          = {{10.1117/12.2545924}},
  volume       = {{11278}},
  year         = {{2020}},
}

@article{20563,
  author       = {{Hannes, W.-R. and Trautmann, Alexander and Stein, M. and Schäfer, F. and Koch, M. and Meier, Torsten}},
  journal      = {{Physical Review B}},
  number       = {{7}},
  pages        = {{075203}},
  publisher    = {{American Physical Society}},
  title        = {{{Strongly nonresonant four-wave mixing in semiconductors}}},
  doi          = {{10.1103/PhysRevB.101.075203}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20772,
  author       = {{Song, Xiaohong and Yang, Shidong and Zuo, Ruixin and Meier, Torsten and Yang, Weifeng}},
  issn         = {{2469-9926}},
  journal      = {{Physical Review A}},
  title        = {{{Enhanced high-order harmonic generation in semiconductors by excitation with multicolor pulses}}},
  doi          = {{10.1103/physreva.101.033410}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20682,
  author       = {{Bocchini, Adriana and Eigner, Christof and Silberhorn, Christine and Schmidt, Wolf Gero and Gerstmann, Uwe}},
  journal      = {{Phys. Rev. Materials}},
  pages        = {{124402}},
  publisher    = {{American Physical Society}},
  title        = {{{Understanding gray track formation in KTP: Ti^3+ centers studied from first principles}}},
  doi          = {{10.1103/PhysRevMaterials.4.124402}},
  volume       = {{4}},
  year         = {{2020}},
}

@inbook{24479,
  author       = {{Moritzer, Elmar and Hüttner, M. and Henning, Bernd and Webersen, Manuel}},
  booktitle    = {{Advances in Polymer Processing 2020}},
  title        = {{{The Influence of Hydrothermal Aging on the Material Properties of Continuous Fiber-Reinforced Thermoplastics and its Non-Destructive Characterization}}},
  doi          = {{10.1007/978-3-662-60809-8_16}},
  year         = {{2020}},
}

@article{21514,
  abstract     = {{The influence of latent heat storage elements on the cooling performance and the temperature rise time of household refrigerating appliances is studied experimentally in the context of the “new global refriger- ator standard”IEC 62552:2015. In addition to the daily energy consumption, this international standard- ization introduced performance tests for cooling capacity and temperature rise time. While the cooling capacity has long been anchored in various test procedures of consumer organizations, the temperature rise time, which has only been tested on freezers so far, will be a decisive factor in the future. Moreover, the need for so-called "smart appliances" that may balance power consumption is increasing since such devices may compensate the volatility of renewable energies and thus stabilize the power grid. Against this background, eight commercial household refrigerators and refrigerator-freezers are equipped with polymer-bound phase change materials (PCM) and their performance is determined under the new stan- dard test conditions. The results show that the introduction of PCM increases the cooling capacity by up to 33 % and also increases the temperature rise time by up to 145 %, without affecting power consump- tion, as compared to the unmodified refrigeration appliances.}},
  author       = {{Sonnenrein, Gerrit and Baumhögger, Elmar and Elsner, Andreas and Morbach, A. and Neukötter, Moritz and Paul, Andreas and Vrabec, J.}},
  issn         = {{0140-7007}},
  journal      = {{International Journal of Refrigeration}},
  pages        = {{448--456}},
  publisher    = {{Elsevier}},
  title        = {{{Improving the performance of household refrigerating appliances through the integration of phase change materials in the context of the new global refrigerator standard IEC 62552:2015}}},
  doi          = {{10.1016/j.ijrefrig.2020.07.025}},
  volume       = {{119}},
  year         = {{2020}},
}

@article{15945,
  author       = {{Tinkloh, Steffen Rainer and Wu, Tao and Tröster, Thomas and Niendorf, Thomas}},
  issn         = {{0263-8223}},
  journal      = {{Composite Structures}},
  title        = {{{A micromechanical-based finite element simulation of process-induced residual stresses in metal-CFRP-hybrid structures}}},
  doi          = {{10.1016/j.compstruct.2020.111926}},
  volume       = {{238}},
  year         = {{2020}},
}

@inproceedings{42892,
  abstract     = {{This paper presents the results of static short-term and long-term tensile tests for beta-nucleated joined polypropylene samples by the hot plate welding process. In the present study different dimensionless joining displacements are accounted for. The results show that high short-term tensile strength does not directly transfer to high long-term tensile strength. The morphology of the weld seam in the joined samples is examined by means of transmitted and reflected light microscopy. For the dimensionless joining displacements of 0.75 and 0.95, stretched spherulites are obtained. X-Ray diffraction can be used as a tool for qualitative and quantitative analysis and eventually for differentiation of samples of various joining displacements.}},
  author       = {{Wübbeke, Andrea and Schöppner, Volker and Paul, André and Tiemann, Michael and Austermeier, Laura and Fitze, Marcus and Chen, Mingie and Jakob, Fabian and Heim, Hans-Peter and Wu, Tao and Niendorf, Thomas and Röhricht, Marie-Luise and Schmidt, Michael}},
  booktitle    = {{SPE ANTEC 2020: The Virtual Edition 5 }},
  title        = {{{Long- and Short-Term Tensile Strength and Morphology of Joined Beta-Nucleated Polypropylene Parts}}},
  year         = {{2020}},
}

@inproceedings{24245,
  author       = {{Schöppner, Volker and Wübbeke, Andrea and Geißler, B. and Schmidt, M. and Maginer, A. and Wu, T. and Niendorf, T. and Jakob, F. and Heim, H.}},
  booktitle    = {{73rd Annual Assembly of the International Institute of Welding (IIW)}},
  location     = {{Marina Bay (Singapore)}},
  publisher    = {{Springer-Verlag}},
  title        = {{{Investigation of residual stresses of hot plate welding}}},
  year         = {{2020}},
}

@article{24236,
  abstract     = {{In diesem Artikel werden das Scherzugverhalten und der morphologische Zustand von konturgeschweißtem Polypropylen (PP) mit einem Massenanteil von 0,2% Ruß untersucht. Dabei zeigen die Ergebnisse ...}},
  author       = {{Schöppner, Volker and Wübbeke, Andrea and Schriegel, Fabian  and Paul, Andrej  and Tiemann, Michael and Geißler, Bastian  and Schmidt, Michael  and Magnier, Arnaud  and Niendorf, Thomas }},
  journal      = {{Joining Plastics}},
  pages        = {{30--35}},
  title        = {{{Selected Aspects for the Assessment of Laser Transmission Welding}}},
  year         = {{2020}},
}

@inproceedings{24472,
  author       = {{Schöppner, Volker and Wübbeke, Andrea and Paul, A. and Tiemann, M. and Austermeier, Laura and Fitze, M. and Chen, M. and Jakob, F. and Heim, H.-P- and Wu, T. and Niendorf, T. and Röhricht, M.-L. and Schmidt, M.}},
  booktitle    = {{ANTEC20}},
  location     = {{Texas (USA)}},
  title        = {{{LONG- AND SHORT-TERM TENSILE STRENGTH AND MORPHOLOGY OF JOINED BETA-NUCLEATED POLYPROPYLENE PARTS}}},
  year         = {{2020}},
}

@article{23797,
  abstract     = {{<jats:title>Abstract</jats:title>
<jats:p>Safety-relevant components in automobiles require materials that combine high strength with sufficient residual ductility and high-energy absorption. A graded thermo-mechanical treatment of the press-hardening steel 22MnB5 with graded microstructure can provide a material with such properties. Different austenitization temperatures, cooling and forming conditions within a sheet part lead to the development of microstructures with mixed phase compositions. To determine the resulting phase contents in such graded processed parts, a large number of dilatometric tests are usually required. With a non-contact characterization method, it is possible to detect local phase transformations on an inhomogeneously treated flat steel specimen. For press-hardening steel after heat treatment and thermo-mechanical processing, correlations between austenitization temperature, hot deformation strain, microstructure, and hardness are established.</jats:p>}},
  author       = {{Reitz, Alexander and Grydin, Olexandr and Schaper, Mirko}},
  issn         = {{1073-5623}},
  journal      = {{Metallurgical and Materials Transactions A}},
  pages        = {{5628--5638}},
  publisher    = {{Springer}},
  title        = {{{Characterization of Phase Transformations During Graded Thermo-Mechanical Processing of Press-Hardening Sheet Steel 22MnB5}}},
  doi          = {{10.1007/s11661-020-05976-x}},
  year         = {{2020}},
}

@article{23899,
  author       = {{Grydin, Olexandr and Matzelt, Manuel and Andreiev, Anatolii and Frolov, Yaroslav and Schaper, Mirko}},
  issn         = {{1438-1656}},
  journal      = {{Advanced Engineering Materials}},
  title        = {{{Influence of Microstructure in Near‐Surface Areas of Feedstocks on the Bond Strength of Roll Bonded Aluminum Clads}}},
  doi          = {{10.1002/adem.202000130}},
  year         = {{2020}},
}

@article{23896,
  author       = {{Andreiev, Anatolii and Hoyer, Kay-Peter and Grydin, Olexandr and Frolov, Yaroslaw and Schaper, Mirko}},
  issn         = {{0933-5137}},
  journal      = {{Materialwissenschaft und Werkstofftechnik}},
  pages        = {{517--530}},
  title        = {{{Degradable silver‐based alloys}}},
  doi          = {{10.1002/mawe.201900191}},
  year         = {{2020}},
}

@article{35953,
  author       = {{Schwabl, Franziska and Janssen, Elmar A. and Sloane, Peter F. E.}},
  issn         = {{0172-2875}},
  journal      = {{Zeitschrift für Berufs- und Wirtschaftspädagogik}},
  keywords     = {{Applied Mathematics, General Mathematics}},
  number       = {{1}},
  pages        = {{138--152}},
  publisher    = {{Wissenschaftliche Verlagsgesellschaft mbH}},
  title        = {{{Sprachsensible Formulierung von Erhebungsinstrumenten}}},
  doi          = {{10.25162/zbw-2020-0005}},
  volume       = {{116}},
  year         = {{2020}},
}

@article{16277,
  abstract     = {{CP2K is an open source electronic structure and molecular dynamics software package to perform atomistic simulations of solid-state, liquid, molecular, and biological systems. It is especially aimed at massively parallel and linear-scaling electronic structure methods and state-of-theart ab initio molecular dynamics simulations. Excellent performance for electronic structure calculations is achieved using novel algorithms implemented for modern high-performance computing systems. This review revisits the main capabilities of CP2K to perform efficient and accurate electronic structure simulations. The emphasis is put on density functional theory and multiple post–Hartree–Fock methods using the Gaussian and plane wave approach and its augmented all-electron extension.}},
  author       = {{Kühne, Thomas and Iannuzzi, Marcella and Ben, Mauro Del and Rybkin, Vladimir V. and Seewald, Patrick and Stein, Frederick and Laino, Teodoro and Khaliullin, Rustam Z. and Schütt, Ole and Schiffmann, Florian and Golze, Dorothea and Wilhelm, Jan and Chulkov, Sergey and Mohammad Hossein Bani-Hashemian, Mohammad Hossein Bani-Hashemian and Weber, Valéry and Borstnik, Urban and Taillefumier, Mathieu and Jakobovits, Alice Shoshana and Lazzaro, Alfio and Pabst, Hans and Müller, Tiziano and Schade, Robert and Guidon, Manuel and Andermatt, Samuel and Holmberg, Nico and Schenter, Gregory K. and Hehn, Anna and Bussy, Augustin and Belleflamme, Fabian and Tabacchi, Gloria and Glöß, Andreas and Lass, Michael and Bethune, Iain and Mundy, Christopher J. and Plessl, Christian and Watkins, Matt and VandeVondele, Joost and Krack, Matthias and Hutter, Jürg}},
  journal      = {{The Journal of Chemical Physics}},
  number       = {{19}},
  title        = {{{CP2K: An electronic structure and molecular dynamics software package - Quickstep: Efficient and accurate electronic structure calculations}}},
  doi          = {{10.1063/5.0007045}},
  volume       = {{152}},
  year         = {{2020}},
}

@inproceedings{16898,
  abstract     = {{Electronic structure calculations based on density-functional theory (DFT)
represent a significant part of today's HPC workloads and pose high demands on
high-performance computing resources. To perform these quantum-mechanical DFT
calculations on complex large-scale systems, so-called linear scaling methods
instead of conventional cubic scaling methods are required. In this work, we
take up the idea of the submatrix method and apply it to the DFT computations
in the software package CP2K. For that purpose, we transform the underlying
numeric operations on distributed, large, sparse matrices into computations on
local, much smaller and nearly dense matrices. This allows us to exploit the
full floating-point performance of modern CPUs and to make use of dedicated
accelerator hardware, where performance has been limited by memory bandwidth
before. We demonstrate both functionality and performance of our implementation
and show how it can be accelerated with GPUs and FPGAs.}},
  author       = {{Lass, Michael and Schade, Robert and Kühne, Thomas and Plessl, Christian}},
  booktitle    = {{Proc. International Conference for High Performance Computing, Networking, Storage and Analysis (SC)}},
  location     = {{Atlanta, GA, US}},
  pages        = {{1127--1140}},
  publisher    = {{IEEE Computer Society}},
  title        = {{{A Submatrix-Based Method for Approximate Matrix Function Evaluation in the Quantum Chemistry Code CP2K}}},
  doi          = {{10.1109/SC41405.2020.00084}},
  year         = {{2020}},
}

@inproceedings{21632,
  abstract     = {{FPGAs have found increasing adoption in data center applications since a new generation of high-level tools have become available which noticeably reduce development time for FPGA accelerators and still provide high-quality results. There is, however, no high-level benchmark suite available, which specifically enables a comparison of FPGA architectures, programming tools, and libraries for HPC applications. To fill this gap, we have developed an OpenCL-based open-source implementation of the HPCC benchmark suite for Xilinx and Intel FPGAs. This benchmark can serve to analyze the current capabilities of FPGA devices, cards, and development tool flows, track progress over time, and point out specific difficulties for FPGA acceleration in the HPC domain. Additionally, the benchmark documents proven performance optimization patterns. We will continue optimizing and porting the benchmark for new generations of FPGAs and design tools and encourage active participation to create a valuable tool for the community. To fill this gap, we have developed an OpenCL-based open-source implementation of the HPCC benchmark suite for Xilinx and Intel FPGAs. This benchmark can serve to analyze the current capabilities of FPGA devices, cards, and development tool flows, track progress over time, and point out specific difficulties for FPGA acceleration in the HPC domain. Additionally, the benchmark documents proven performance optimization patterns. We will continue optimizing and porting the benchmark for new generations of FPGAs and design tools and encourage active participation to create a valuable tool for the community.}},
  author       = {{Meyer, Marius and Kenter, Tobias and Plessl, Christian}},
  booktitle    = {{2020 IEEE/ACM International Workshop on Heterogeneous High-performance Reconfigurable Computing (H2RC)}},
  isbn         = {{9781665415927}},
  keywords     = {{FPGA, OpenCL, High Level Synthesis, HPC benchmarking}},
  title        = {{{Evaluating FPGA Accelerator Performance with a Parameterized OpenCL Adaptation of Selected Benchmarks of the HPCChallenge Benchmark Suite}}},
  doi          = {{10.1109/h2rc51942.2020.00007}},
  year         = {{2020}},
}