@inproceedings{36377, author = {{Berger, Thomas and Kästner, C. and Worthmann, K.}}, booktitle = {{IFAC-PapersOnLine}}, pages = {{5177--5182}}, title = {{{Learning-based Funnel-MPC for output-constrained nonlinear systems}}}, volume = {{53}}, year = {{2020}}, } @article{36370, author = {{Berger, Thomas}}, journal = {{Automatica}}, title = {{{Tracking with prescribed performance for linear non-minimum phase systems}}}, volume = {{115}}, year = {{2020}}, } @article{36349, author = {{Berger, Thomas and Rauert, A.-L.}}, journal = {{Automatica}}, title = {{{Funnel cruise control}}}, volume = {{119}}, year = {{2020}}, } @inbook{36358, author = {{Berger, Thomas and Huy Hoang, Le and Reis, T.}}, booktitle = {{Progress in Differential-Algebraic Equations II}}, editor = {{Grundel, S. and Reis, T. and Schöps, S.}}, pages = {{213--255}}, publisher = {{Springer}}, title = {{{Vector relative degree and funnel control for differential-algebraic systems}}}, year = {{2020}}, } @inbook{36351, author = {{Berger, Thomas and Lanza, Lukas Johannes}}, booktitle = {{Progress in Differential-Algebraic Equations II}}, editor = {{Grundel, S. and Reis, T. and Schöps, S.}}, pages = {{257--289}}, publisher = {{Springer}}, title = {{{Observers for differential-algebraic systems with Lipschitz or monotone nonlinearities}}}, year = {{2020}}, } @inproceedings{36380, author = {{Lee, J.G. and Berger, Thomas and Trenn, S. and Shim, H.}}, booktitle = {{Proceedings of the European Control Confrence 2020}}, location = {{Saint Petersburg, Russia}}, pages = {{911--916}}, title = {{{Utility of Edge-wise Funnel Coupling for Asymptotically Solving Distributed Consensus Optimization}}}, year = {{2020}}, } @article{35936, author = {{Caruso, Carina}}, journal = {{ katholisch.de, Kolumne „Mein Religionsunterricht“. }}, title = {{{Schüler für ein Fach begeistern? Mit "Liebe" geht's!}}}, year = {{2020}}, } @article{37021, author = {{Chiapello, Eve and Knoll, Lisa}}, issn = {{1387-6988}}, journal = {{Journal of Comparative Policy Analysis: Research and Practice}}, keywords = {{Public Administration, Sociology and Political Science}}, number = {{2}}, pages = {{100--115}}, publisher = {{Informa UK Limited}}, title = {{{The Welfare Conventions Approach: A Comparative Perspective on Social Impact Bonds}}}, doi = {{10.1080/13876988.2019.1695965}}, volume = {{22}}, year = {{2020}}, } @article{37023, author = {{Chiapello, Eve and Knoll, Lisa}}, journal = {{Historical Social Research}}, number = {{3}}, pages = {{7--30}}, title = {{{Social Finance and Impact Investing: Governing Welfare in the Era of Financialization}}}, volume = {{45}}, year = {{2020}}, } @book{47618, editor = {{Althoff, Sebastian and Linseisen, Elisa and Müller, Maja-Lisa and Winter, Franziska}}, isbn = {{978-3-7705-6495-8}}, publisher = {{Wilhelm Fink}}, title = {{{Re/Dissolving Mimesis}}}, year = {{2020}}, } @inbook{47623, author = {{Althoff, Sebastian}}, booktitle = {{Re/Dissolving Mimesis}}, editor = {{Linseisen, Elisa and Müller, Maja-Lisa and Winter, Franziska}}, publisher = {{Wilhelm Fink}}, title = {{{A CCTV Image that Dissolves like Smeared Data: Distinguishability versus Similarity}}}, doi = {{10.30965/9783846764954_012}}, year = {{2020}}, } @inbook{47622, author = {{Althoff, Sebastian and Linseisen, Elisa and Müller, Maja-Lisa and Winter, Franziska}}, booktitle = {{Re/Dissolving Mimesis}}, editor = {{Linseisen, Elisa and Müller, Maja-Lisa and Winter, Franziska}}, publisher = {{Wilhelm Fink}}, title = {{{Editorial: Re/Dissolving Mimesis}}}, doi = {{10.30965/9783846764954_004}}, year = {{2020}}, } @article{47624, author = {{Althoff, Sebastian}}, journal = {{Performance Research}}, number = {{7}}, pages = {{92--98}}, title = {{{Seeping Out: The diminishment of the subject in Hito Steyerl’s How Not to Be Seen}}}, doi = {{10.1080/13528165.2019.1717871}}, volume = {{24}}, year = {{2020}}, } @inproceedings{13226, abstract = {{The canonical problem for the class Quantum Merlin-Arthur (QMA) is that of estimating ground state energies of local Hamiltonians. Perhaps surprisingly, [Ambainis, CCC 2014] showed that the related, but arguably more natural, problem of simulating local measurements on ground states of local Hamiltonians (APX-SIM) is likely harder than QMA. Indeed, [Ambainis, CCC 2014] showed that APX-SIM is P^QMA[log]-complete, for P^QMA[log] the class of languages decidable by a P machine making a logarithmic number of adaptive queries to a QMA oracle. In this work, we show that APX-SIM is P^QMA[log]-complete even when restricted to more physical Hamiltonians, obtaining as intermediate steps a variety of related complexity-theoretic results. We first give a sequence of results which together yield P^QMA[log]-hardness for APX-SIM on well-motivated Hamiltonians: (1) We show that for NP, StoqMA, and QMA oracles, a logarithmic number of adaptive queries is equivalent to polynomially many parallel queries. These equalities simplify the proofs of our subsequent results. (2) Next, we show that the hardness of APX-SIM is preserved under Hamiltonian simulations (a la [Cubitt, Montanaro, Piddock, 2017]). As a byproduct, we obtain a full complexity classification of APX-SIM, showing it is complete for P, P^||NP, P^||StoqMA, or P^||QMA depending on the Hamiltonians employed. (3) Leveraging the above, we show that APX-SIM is P^QMA[log]-complete for any family of Hamiltonians which can efficiently simulate spatially sparse Hamiltonians, including physically motivated models such as the 2D Heisenberg model. Our second focus considers 1D systems: We show that APX-SIM remains P^QMA[log]-complete even for local Hamiltonians on a 1D line of 8-dimensional qudits. This uses a number of ideas from above, along with replacing the "query Hamiltonian" of [Ambainis, CCC 2014] with a new "sifter" construction.}}, author = {{Gharibian, Sevag and Piddock, Stephen and Yirka, Justin}}, booktitle = {{Proceedings of the 37th Symposium on Theoretical Aspects of Computer Science (STACS 2020)}}, pages = {{38}}, title = {{{Oracle complexity classes and local measurements on physical Hamiltonians}}}, year = {{2020}}, } @article{22056, author = {{Spychala, K. J. and Mackwitz, P. and Rüsing, Michael and Widhalm, A. and Berth, Gerhard and Silberhorn, Christine and Zrenner, Artur}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, title = {{{Nonlinear focal mapping of ferroelectric domain walls in LiNbO3: Analysis of the SHG microscopy contrast mechanism}}}, doi = {{10.1063/5.0025284}}, year = {{2020}}, } @article{25920, author = {{Padberg, Laura and Santandrea, Matteo and Rüsing, Michael and Brockmeier, Julian and Mackwitz, Peter and Berth, Gerhard and Zrenner, Artur and Eigner, Christof and Silberhorn, Christine}}, issn = {{1094-4087}}, journal = {{Optics Express}}, title = {{{Characterisation of width-dependent diffusion dynamics in rubidium-exchanged KTP waveguides}}}, doi = {{10.1364/oe.397074}}, year = {{2020}}, } @article{47956, abstract = {{Optically nonlinear Pb2B5O9X (X = Cl, Br) borate halides are an important group of materials for second harmonic generation (SHG). Additionally, they also possess excellent photocatalytic activity and stability in the process of dechlorination of chlorophenols, which are typical persistent organic pollutants. It would be of great interest to conduct in situ (photo‐) catalysis investigations during the whole photocatalytic process by SHG when considering them as photocatalytic materials. In order to get superior photocatalytic efficiency and maximum surface information, small particles are highly desired. Here, a low‐cost and fast synthesis route that allows growing microcrystalline optically nonlinear Pb2B5O9X borate halides at large quantities is introduced. When applying the ionothermal growth process at temperatures between 130 and 170 °C, microcrystallites with an average size of about 1 µm precipitate with an orthorhombic hilgardite‐like borate halide structure. Thorough examinations using powder X‐ray diffraction and scanning electron microscopy, the Pb2B5O9X microcrystals are indicated to be chemically pure and single‐phased. Besides, the Pb2B5O9X borate halides' SHG efficiencies are confirmed using confocal SHG microscopy. The low‐temperature synthesis route thus makes these borate halides a highly desirable material for surface studies such as monitoring chemical reactions with picosecond time resolution and in situ (photo‐) catalysis investigations.}}, author = {{Tan, Deming and Kirbus, Benjamin and Rüsing, Michael and Pietsch, Tobias and Ruck, Michael and Eng, Lukas M.}}, issn = {{1613-6810}}, journal = {{Small}}, keywords = {{Biomaterials, Biotechnology, General Materials Science, General Chemistry}}, number = {{23}}, publisher = {{Wiley}}, title = {{{Resource‐Efficient Low‐Temperature Synthesis of Microcrystalline Pb2B5O9X (X = Cl, Br) for Surfaces Studies by Optical Second Harmonic Generation}}}, doi = {{10.1002/smll.202000857}}, volume = {{16}}, year = {{2020}}, } @article{47958, abstract = {{High-fidelity periodic poling over long lengths is required for robust, quasi-phase-matched second-harmonic generation using the fundamental, quasi-TE polarized waveguide modes in a thin-film lithium niobate (TFLN) waveguide. Here, a shallow-etched ridge waveguide is fabricated in x-cut magnesium oxide doped TFLN and is poled accurately over 5 mm. The high fidelity of the poling is demonstrated over long lengths using a non-destructive technique of confocal scanning second-harmonic microscopy. We report a second-harmonic conversion efficiency of up to 939 %/W (length-normalized conversion efficiency 3757 %/Wcm²), measured at telecommunications wavelengths. The device demonstrates a narrow spectral linewidth (1 nm) and can be tuned precisely with a tuning characteristic of 0.1 nm/°C, over at least 40 °C without measurable loss of efficiency.}}, author = {{Zhao, Jie and Rüsing, Michael and Javid, Usman A. and Ling, Jingwei and Li, Mingxiao and Lin, Qiang and Mookherjea, Shayan}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{13}}, publisher = {{Optica Publishing Group}}, title = {{{Shallow-etched thin-film lithium niobate waveguides for highly-efficient second-harmonic generation}}}, doi = {{10.1364/oe.395545}}, volume = {{28}}, year = {{2020}}, } @article{47955, abstract = {{Quasi-phase-matched grating structures in lithium niobate waveguides with sub-micrometer periodicities will benefit the development of short-wavelength nonlinear optical devices. Here, we report on the reproducible formation of periodically poled domains in x-cut single-crystalline thin-film lithium niobate with periodicities as short as 600 nm. Shaped single-voltage poling pulses were applied to electrode structures that were fabricated by a combination of electron-beam and direct-writing laser lithography. Evidence of successful poling with good quality was obtained through second-harmonic microscopy and piezoresponse force microscopy imaging. For the sub-micrometer period structures, we observed patterns with a double periodicity formed by domain interactions and features with sizes <200 nm.}}, author = {{Zhao, Jie and Rüsing, Michael and Roeper, Matthias and Eng, Lukas M. and Mookherjea, Shayan}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, keywords = {{General Physics and Astronomy}}, number = {{19}}, publisher = {{AIP Publishing}}, title = {{{Poling thin-film x-cut lithium niobate for quasi-phase matching with sub-micrometer periodicity}}}, doi = {{10.1063/1.5143266}}, volume = {{127}}, year = {{2020}}, } @article{47952, author = {{Zhao, Jie and Ma, Chaoxuan and Rüsing, Michael and Mookherjea, Shayan}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{General Physics and Astronomy}}, number = {{16}}, publisher = {{American Physical Society (APS)}}, title = {{{High Quality Entangled Photon Pair Generation in Periodically Poled Thin-Film Lithium Niobate Waveguides}}}, doi = {{10.1103/physrevlett.124.163603}}, volume = {{124}}, year = {{2020}}, }