@misc{44029, author = {{Schroeter-Wittke, Harald}}, booktitle = {{Zeitschrift für Pädagogik und Theologie}}, pages = {{465--466}}, title = {{{Ingo Reuter: Surfaces│Oberflächen: Haut │ Spiegel │ Kleidung │ Wasser │ Bildschirm │ Erde. Würzburg 2019}}}, volume = {{71}}, year = {{2019}}, } @misc{44025, author = {{Schroeter-Wittke, Harald}}, booktitle = {{Jahrbuch für Westfälische Kirchengeschichte}}, pages = {{496--498}}, title = {{{Jürgen Bärsch / Reimund Haas (Hgg.), Christen an der Ruhr, Band 6, Münster 2018}}}, volume = {{115}}, year = {{2019}}, } @misc{44030, author = {{Schroeter-Wittke, Harald}}, booktitle = {{Der Kirchentag. Das Magazin}}, number = {{4}}, pages = {{8--9}}, title = {{{schaut hin (Mk 6,38). Ein Blick auf das Leitwort für den 3. Ökumenischen Kirchentag 2021 in Frankfurt am Main}}}, year = {{2019}}, } @misc{44027, author = {{Schroeter-Wittke, Harald}}, booktitle = {{Luther}}, pages = {{192--194}}, title = {{{Peter Zimmerling / Wolfgang Ratzmann / Armin Kohnle (Hg.): Martin Luther als Praktischer Theologe, Leipzig 2017}}}, volume = {{90}}, year = {{2019}}, } @misc{44028, author = {{Schroeter-Wittke, Harald}}, booktitle = {{Wege zum Menschen}}, pages = {{437--438}}, title = {{{Elisabeth von Thadden: Die berührungslose Gesellschaft, München 2018}}}, volume = {{71}}, year = {{2019}}, } @article{10014, abstract = {{The cubic, tetragonal, and orthorhombic phase of potassium niobate (KNbO3) are studied based on density-functional theory. Starting from the relaxed atomic geometries, we analyze the influence of self-energy corrections on the electronic band structure within the GW approximation. We find that quasiparticle shifts widen the direct (indirect) band gap by 1.21 (1.44), 1.58 (1.55), and 1.67 (1.64) eV for the cubic, tetragonal, and orthorhombic phase, respectively. By solving the Bethe-Salpeter equation, we obtain the linear dielectric function with excitonic and local-field effects, which turn out to be essential for good agreement with experimental data. From our results, we extract an exciton binding energy of 0.6, 0.5, and 0.5 eV for the cubic, tetragonal, and orthorhombic phase, respectively. Furthermore, we investigate the nonlinear second-harmonic generation (SHG) both theoretically and experimentally. The frequency-dependent second-order polarization tensor of orthorhombic KNbO3 is measured for incoming photon energies between 1.2 and 1.6 eV. In addition, calculations within the independent-(quasi)particle approximation are performed for the tetragonal and orthorhombic phase. The novel experimental data are in excellent agreement with the quasiparticle calculations and resolve persistent discrepancies between earlier experimental measurements and ab initio results reported in the literature.}}, author = {{Schmidt, Falko and Riefer, Arthur and Schmidt, Wolf Gero and Schindlmayr, Arno and Imlau, Mirco and Dobener, Florian and Mengel, Nils and Chatterjee, Sangam and Sanna, Simone}}, issn = {{2475-9953}}, journal = {{Physical Review Materials}}, number = {{5}}, publisher = {{American Physical Society}}, title = {{{Quasiparticle and excitonic effects in the optical response of KNbO3}}}, doi = {{10.1103/PhysRevMaterials.3.054401}}, volume = {{3}}, year = {{2019}}, } @article{29746, author = {{Nicholson, C. W. and Puppin, M. and Lücke, A. and Gerstmann, Uwe and Krenz, Marvin and Schmidt, Wolf Gero and Rettig, L. and Ernstorfer, R. and Wolf, M.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{15}}, publisher = {{American Physical Society (APS)}}, title = {{{Excited-state band mapping and momentum-resolved ultrafast population dynamics in In/Si(111) nanowires investigated with XUV-based time- and angle-resolved photoemission spectroscopy}}}, doi = {{10.1103/physrevb.99.155107}}, volume = {{99}}, year = {{2019}}, } @article{10015, author = {{Dues, Christof and Schmidt, Wolf Gero and Sanna, Simone}}, issn = {{2470-1343}}, journal = {{ACS Omega}}, pages = {{3850--3859}}, title = {{{Water Splitting Reaction at Polar Lithium Niobate Surfaces}}}, doi = {{10.1021/acsomega.8b03271}}, year = {{2019}}, } @article{26296, author = {{Sperling, Jan and Perez-Leija, Armando and Busch, Kurt and Silberhorn, Christine}}, issn = {{2469-9926}}, journal = {{Physical Review A}}, title = {{{Mode-independent quantum entanglement for light}}}, doi = {{10.1103/physreva.100.062129}}, year = {{2019}}, } @article{37288, abstract = {{An integrated chip with quantum state generation, active polarization manipulation, and precise time control is demonstrated.}}, author = {{Luo, Kai-Hong and Brauner, Sebastian and Eigner, Christof and Sharapova, Polina and Ricken, Raimund and Meier, Torsten and Herrmann, Harald and Silberhorn, Christine}}, issn = {{2375-2548}}, journal = {{Science Advances}}, keywords = {{Multidisciplinary}}, number = {{1}}, publisher = {{American Association for the Advancement of Science (AAAS)}}, title = {{{Nonlinear integrated quantum electro-optic circuits}}}, doi = {{10.1126/sciadv.aat1451}}, volume = {{5}}, year = {{2019}}, } @inproceedings{13285, author = {{Hannes, Wolf-Rüdiger and Krauß-Kodytek, Laura and Ruppert, Claudia and Betz, Markus and Meier, Torsten}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XXIII}}, editor = {{Betz, Markus and Elezzabi, Abdulhakem Y.}}, isbn = {{9781510624740}}, title = {{{Intensity-dependent degenerate and non-degenerate nonlinear optical absorption of direct-gap semiconductors}}}, doi = {{10.1117/12.2503539}}, volume = {{10916}}, year = {{2019}}, } @article{13284, author = {{Hannes, Wolf-Rüdiger and Meier, Torsten}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{12}}, title = {{{Higher-order contributions and nonperturbative effects in the nondegenerate nonlinear optical absorption of semiconductors using a two-band model}}}, doi = {{10.1103/physrevb.99.125301}}, volume = {{99}}, year = {{2019}}, } @article{13365, abstract = {{The KTiOPO4 (KTP) band structure and dielectric function are calculated on various levels of theory starting from density-functional calculations. Within the independent-particle approximation an electronic transport gap of 2.97 eV is obtained that widens to about 5.23 eV when quasiparticle effects are included using the GW approximation. The optical response is shown to be strongly anisotropic due to (i) the slight asymmetry of the TiO6 octahedra in the (001) plane and (ii) their anisotropic distribution along the [001] and [100] directions. In addition, excitonic effects are very important: The solution of the Bethe–Salpeter equation indicates exciton binding energies of the order of 1.5 eV. Calculations that include both quasiparticle and excitonic effects are in good agreement with the measured reflectivity.}}, author = {{Neufeld, Sergej and Bocchini, Adriana and Gerstmann, Uwe and Schindlmayr, Arno and Schmidt, Wolf Gero}}, issn = {{2515-7639}}, journal = {{Journal of Physics: Materials}}, pages = {{045003}}, publisher = {{IOP Publishing}}, title = {{{Potassium titanyl phosphate (KTP) quasiparticle energies and optical response}}}, doi = {{10.1088/2515-7639/ab29ba}}, volume = {{2}}, year = {{2019}}, } @article{22445, abstract = {{Am Beispiel des chinesisch-deutschen Kooperationsstudiengangs Maschinenbau an der Chinesisch-Deutschen Technischen Fakultät in Qingdao (China) werden unter Rückgriff auf unterschiedliche im Rahmen formativer Evaluation erhobener Datensätze Möglichkeiten und Grenzen der Integration von Fach- und Sprachlernen sowie Optimierungsmöglichkeiten der Unterstützung des studienvorbereitenden und -begleitenden (Fach-)Spracherwerbs diskutiert.}}, author = {{Denzer, Vera and Didier, Andrea and Drumm, Sandra and Hambach, Dennis and Kaplinska-Zajontz, Marta and Noeke, Josef and Settinieri, Julia and Xi, Lin and Zhu, Hongyu}}, isbn = {{2511-0853}}, journal = {{Informationen Deutsch als Fremdsprache}}, number = {{1}}, pages = {{178--199}}, publisher = {{De Gruyter Mouton}}, title = {{{Integration von Sprach- und Fachlernen im Kontext chinesisch-deutscher Kooperationsstudiengänge am Beispiel des Maschinenbaustudiums an der Chinesisch-Deutschen Technischen Fakultät (CDTF, Qingdao/Paderborn)}}}, doi = {{10.1515/infodaf-2019-0013}}, volume = {{46}}, year = {{2019}}, } @phdthesis{42809, author = {{Schmidt, Hans Christian}}, title = {{{Ein Beitrag zum stoffschlüssigen Fügen durch plastische Deformation: partielles Kaltpressschweißen durch inkrementelles Walzen}}}, year = {{2019}}, } @phdthesis{42799, author = {{Lossen, Benjamin}}, isbn = {{978-3-8440-6729-3}}, title = {{{Ein Beitrag zur Herstellung von hybriden Bauteilen mittels Reibdrücken}}}, year = {{2019}}, } @inbook{42367, author = {{Fuchs, Christian}}, booktitle = {{Digital Objects, Digital Subjects: Interdisciplinary Perspectives on Capitalism, Labour and Politics in the Age of Big Data}}, editor = {{Chandler, David and Fuchs, Christian}}, publisher = {{University of Westminster Press}}, title = {{{Beyond Big Data Capitalism, Towards Dialectical Digital Modernity: Reflections on David Chandler’s Chapter}}}, doi = {{https://doi.org/10.16997/book29.c}}, volume = {{43-51}}, year = {{2019}}, } @inbook{41799, author = {{Fuchs, Christian and Chandler, David}}, booktitle = {{Digital Objects, Digital Subjects: Interdisciplinary Perspectives on Capitalism, Labour and Politics in the Age of Big Data}}, editor = {{Chandler, David and Fuchs, Christian}}, isbn = {{978-1-912656-20-2}}, pages = {{1--20}}, publisher = {{University of Westminster Press}}, title = {{{Introduction: Big Data Capitalism – Politics, Activism, and Theory}}}, doi = {{https://doi.org/10.16997/book29.a}}, year = {{2019}}, } @inbook{42368, author = {{Fuchs, Christian}}, booktitle = {{Digital Objects, Digital Subjects: Interdisciplinary Perspectives on Capitalism, Labour and Politics in the Age of Big Data}}, editor = {{Chandler, David and Fuchs, Christian}}, publisher = {{University of Westminster Press}}, title = {{{Karl Marx in the Age of Big Data Capitalism}}}, doi = {{https://doi.org/10.16997/book29.d}}, volume = {{53-71}}, year = {{2019}}, } @techreport{42495, author = {{Fuchs, Christian and Michalis, Maria}}, title = {{{Evidence submitted to the House of Commons-Environment, Food and Rural Affairs Committee’s Inquiry on Rural Broadband and Digital Only Services, published on 26 June 2019}}}, year = {{2019}}, }