@article{40233,
  author       = {{Meier, Lukas and Braun, Christian and Hannappel, Thomas and Schmidt, Wolf Gero}},
  issn         = {{0370-1972}},
  journal      = {{physica status solidi (b)}},
  keywords     = {{Condensed Matter Physics, Electronic, Optical and Magnetic Materials}},
  number       = {{2}},
  publisher    = {{Wiley}},
  title        = {{{Band Alignment at Ga            <sub>              <i>x</i>            </sub>            In            <sub>              1–              <i>x</i>            </sub>            P/Al            <sub>              <i>y</i>            </sub>            In            <sub>              1–              <i>y</i>            </sub>            P Alloy Interfaces from Hybrid Density Functional Theory Calculations}}},
  doi          = {{10.1002/pssb.202000463}},
  volume       = {{258}},
  year         = {{2020}},
}

@article{40438,
  abstract     = {{<jats:p>Semiconductor microcavities are frequently studied in the context of semiconductor lasers and in application-oriented fundamental research on topics such as linear and nonlinear polariton systems, polariton lasers, polariton pattern formation, and polaritonic Bose–Einstein condensates. A commonly used approach to describe theoretical properties includes a phenomenological single-mode equation that complements the equation for the nonlinear optical response (interband polarization) of the semiconductor. Here, we show how to replace the single-mode equation by a fully predictive transfer function method that, in contrast to the single-mode equation, accounts for propagation, retardation, and pulse-filtering effects of the incident light field traversing the distributed Bragg reflector (DBR) mirrors, without substantially increasing the numerical complexity of the solution. As examples, we use cavities containing GaAs quantum wells and transition-metal dichalcogenides (TMDs).</jats:p>}},
  author       = {{Carcamo, M. and Schumacher, Stefan and Binder, R.}},
  issn         = {{1559-128X}},
  journal      = {{Applied Optics}},
  keywords     = {{Atomic and Molecular Physics, and Optics, Engineering (miscellaneous), Electrical and Electronic Engineering}},
  number       = {{22}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Transfer function replacement of phenomenological single-mode equations in semiconductor microcavity modeling}}},
  doi          = {{10.1364/ao.392014}},
  volume       = {{59}},
  year         = {{2020}},
}

@article{41519,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Different studies have been demonstrated that the surface integrity of substrate bulk materials to be coated has a significant impact on the adhesion of thermally sprayed coatings. It is known that the surface integrity of parts processed by selective laser melting (SLM) differs from those obtained from bulk materials. Although 316L stainless steel is among the most investigated material for SLM, the adhesion of thermally sprayed coatings on 316L stainless steel substrates processed by SLM has not been studied yet. This study aims at evaluating the effect of various mechanical pre-treatments onto 316L stainless steel substrates processed by SLM and their effect on the adhesion of high velocity oxy-fuel (HVOF)-sprayed WC-Co coatings. To differentiate between topographical effects and residual stress-related phenomena, a stress-relief heat treatment of the SLM substrates served as a reference throughout the investigations. The differently pre-treated SLM substrates were investigated with regard to the surface roughness and residual stresses. For the HVOF-sprayed SLM composites, Vickers interfacial indentation tests were conducted to assess the resulting coating adhesion. The findings demonstrated that the HVOF-sprayed WC-Co coatings predominantly exhibit good adhesion to the SLM 316L substrates. However, it was found that the stress state in the SLM 316L substrate surface is more likely to affect the adhesion of the WC-Co coating, while the substrate surface roughness showed a marginal effect.</jats:p>}},
  author       = {{Tillmann, Wolfgang and Hagen, Leif and Schaak, Christoph and Liß, J. and Schaper, Mirko and Hoyer, Kay-Peter and Aydinöz, Mehmet Esat and Garthe, Kai-Uwe}},
  issn         = {{1059-9630}},
  journal      = {{Journal of Thermal Spray Technology}},
  keywords     = {{Materials Chemistry, Surfaces, Coatings and Films, Condensed Matter Physics}},
  number       = {{6}},
  pages        = {{1396--1409}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Adhesion of HVOF-Sprayed WC-Co Coatings on 316L Substrates Processed by SLM}}},
  doi          = {{10.1007/s11666-020-01081-y}},
  volume       = {{29}},
  year         = {{2020}},
}

@article{41518,
  author       = {{Tillmann, Wolfgang and Hagen, Leif and Garthe, Kai-Uwe and Hoyer, Kay-Peter and Schaper, Mirko}},
  issn         = {{0933-5137}},
  journal      = {{Materialwissenschaft und Werkstofftechnik}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}},
  number       = {{11}},
  pages        = {{1452--1464}},
  publisher    = {{Wiley}},
  title        = {{{Effect of substrate pre‐treatment on the low cycle fatigue performance of tungsten carbide‐cobalt coated additive manufactured 316 L substrates}}},
  doi          = {{10.1002/mawe.202000109}},
  volume       = {{51}},
  year         = {{2020}},
}

@article{41520,
  author       = {{Wu, Haoran and Bill, T. and Teng, Z.J. and Pramanik, Sudipta and Hoyer, Kay-Peter and Schaper, Mirko and Starke, Peter}},
  issn         = {{0921-5093}},
  journal      = {{Materials Science and Engineering: A}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}},
  publisher    = {{Elsevier BV}},
  title        = {{{Characterization of the fatigue behaviour for SAE 1045 steel without and with load-free sequences based on non-destructive, X-ray diffraction and transmission electron microscopic investigations}}},
  doi          = {{10.1016/j.msea.2020.139597}},
  volume       = {{794}},
  year         = {{2020}},
}

@article{41521,
  author       = {{Tillmann, Wolfgang and Lopes Dias, Nelson Filipe and Stangier, Dominic and Hagen, Leif and Schaper, Mirko and Hengsbach, Florian and Hoyer, Kay-Peter}},
  issn         = {{0257-8972}},
  journal      = {{Surface and Coatings Technology}},
  keywords     = {{Materials Chemistry, Surfaces, Coatings and Films, Surfaces and Interfaces, Condensed Matter Physics, General Chemistry}},
  publisher    = {{Elsevier BV}},
  title        = {{{Tribo-mechanical properties and adhesion behavior of DLC coatings sputtered onto 36NiCrMo16 produced by selective laser melting}}},
  doi          = {{10.1016/j.surfcoat.2020.125748}},
  volume       = {{394}},
  year         = {{2020}},
}

@article{41522,
  author       = {{Andreiev, Anatolii and Hoyer, Kay-Peter and Grydin, Olexandr and Frolov, Yaroslav and Schaper, Mirko}},
  issn         = {{0933-5137}},
  journal      = {{Materialwissenschaft und Werkstofftechnik}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}},
  number       = {{4}},
  pages        = {{517--530}},
  publisher    = {{Wiley}},
  title        = {{{Degradable silver‐based alloys}}},
  doi          = {{10.1002/mawe.201900191}},
  volume       = {{51}},
  year         = {{2020}},
}

@article{39414,
  author       = {{Anerot, Baptiste and Cresson, Jacky and Hariz Belgacem, Khaled and Pierret, Frederic}},
  issn         = {{0022-2488}},
  journal      = {{Journal of Mathematical Physics}},
  keywords     = {{Mathematical Physics, Statistical and Nonlinear Physics}},
  number       = {{11}},
  publisher    = {{AIP Publishing}},
  title        = {{{Noether’s-type theorems on time scales}}},
  doi          = {{10.1063/1.5140201}},
  volume       = {{61}},
  year         = {{2020}},
}

@article{39399,
  author       = {{Anerot, Baptiste and Cresson, Jacky and Hariz Belgacem, Khaled and Pierret, Frederic}},
  issn         = {{0022-2488}},
  journal      = {{Journal of Mathematical Physics}},
  keywords     = {{Mathematical Physics, Statistical and Nonlinear Physics}},
  number       = {{11}},
  publisher    = {{AIP Publishing}},
  title        = {{{Noether’s-type theorems on time scales}}},
  doi          = {{10.1063/1.5140201}},
  volume       = {{61}},
  year         = {{2020}},
}

@article{38051,
  abstract     = {{<jats:p>The characterisation of loss in optical waveguides is essential in understanding the performance of these devices and their limitations. Whilst interferometric-based methods generally provide the best results for low-loss waveguides, they are almost exclusively used to provide characterization in cases where the waveguide is spatially single-mode. Here, we introduce a Fabry-Pérot-based scheme to estimate the losses of a nonlinear (birefringent or quasi-phase matched) waveguide at a wavelength where it is multi-mode. The method involves measuring the generated second harmonic power as the pump wavelength is scanned over the phase matching region. Furthermore, it is shown that this method allows one to infer the losses of different second harmonic spatial modes by scanning the pump field over the separated phase matching spectra. By fitting the measured phase matching spectra from different titanium indiffused lithium niobate waveguides to the model presented in this paper, it is shown that one can estimate the second harmonic losses of a single spatial-mode, at wavelengths where the waveguides are spatially multi-mode.</jats:p>}},
  author       = {{Santandrea, Matteo and Stefszky, Michael and Roeland, Ganaël and Silberhorn, Christine}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{4}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Interferometric method for determining the losses of spatially multi-mode nonlinear waveguides based on second harmonic generation.}}},
  doi          = {{10.1364/oe.380788}},
  volume       = {{28}},
  year         = {{2020}},
}

@article{40381,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>The phenomenon of entanglement is the basis of quantum information and quantum communication processes. Entangled systems with a large number of photons are of great interest at present because they provide a platform for streaming technologies based on photonics. In this paper we present a device which operates with four-photons and based on the Hong–Ou–Mandel interference. The presented device allows to maximize the degree of spatial entanglement and generate the highly entangled four-dimensional Bell states. Furthermore, the use of the interferometer in different regimes leads to fast interference fringes in the coincidence probability with period of oscillations twice smaller than the pump wavelength. We have a good agreement between theoretical simulations and experimental results.</jats:p>}},
  author       = {{Ferreri, A and Ansari, V and Brecht, Benjamin and Silberhorn, Christine and Sharapova, Polina R.}},
  issn         = {{2058-9565}},
  journal      = {{Quantum Science and Technology}},
  keywords     = {{Electrical and Electronic Engineering, Physics and Astronomy (miscellaneous), Materials Science (miscellaneous), Atomic and Molecular Physics, and Optics}},
  number       = {{4}},
  publisher    = {{IOP Publishing}},
  title        = {{{Spatial entanglement and state engineering via four-photon Hong–Ou–Mandel interference}}},
  doi          = {{10.1088/2058-9565/abb411}},
  volume       = {{5}},
  year         = {{2020}},
}

@article{37933,
  abstract     = {{<jats:p>We present a time-over-threshold readout technique to count the number of activated pixels from an array of superconducting nanowire single photon detectors (SNSPDs). This technique places no additional heatload on the cryostat, and retains the intrinsic count rate of the time-tagger. We demonstrate proof-of-principle operation with respect to a four-pixel device. Furthermore, we show that, given some permissible error threshold, the number of pixels that can be reliably read out scales linearly with the intrinsic signal-to-noise ratio of the individual pixel response.</jats:p>}},
  author       = {{Tiedau, Johannes and Schapeler, Timon and Anant, Vikas and Fedder, Helmut and Silberhorn, Christine and Bartley, Tim}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{4}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Single-channel electronic readout of a multipixel superconducting nanowire single photon detector}}},
  doi          = {{10.1364/oe.383111}},
  volume       = {{28}},
  year         = {{2020}},
}

@article{30928,
  author       = {{Yu, Xiaoqian and Herberg, Artjom and Kuckling, Dirk}},
  issn         = {{0014-3057}},
  journal      = {{European Polymer Journal}},
  keywords     = {{Organic Chemistry, Polymers and Plastics, General Physics and Astronomy, Materials Chemistry}},
  publisher    = {{Elsevier BV}},
  title        = {{{Azlactone-functionalized smart block copolymers for organocatalyst immobilization}}},
  doi          = {{10.1016/j.eurpolymj.2019.08.034}},
  volume       = {{120}},
  year         = {{2019}},
}

@article{30933,
  author       = {{Sun, Jingjiang and Anderski, Juliane and Picker, Marie-Theres and Langer, Klaus and Kuckling, Dirk}},
  issn         = {{1022-1352}},
  journal      = {{Macromolecular Chemistry and Physics}},
  keywords     = {{Materials Chemistry, Organic Chemistry, Polymers and Plastics, Physical and Theoretical Chemistry, Condensed Matter Physics}},
  number       = {{5}},
  publisher    = {{Wiley}},
  title        = {{{Preparation of Light-Responsive Aliphatic Polycarbonate via Versatile Polycondensation for Controlled Degradation}}},
  doi          = {{10.1002/macp.201800539}},
  volume       = {{220}},
  year         = {{2019}},
}

@article{34669,
  author       = {{Black, Tobias}},
  issn         = {{1422-6928}},
  journal      = {{Journal of Mathematical Fluid Mechanics}},
  keywords     = {{Applied Mathematics, Computational Mathematics, Condensed Matter Physics, Mathematical Physics}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{The Stokes Limit in a Three-Dimensional Chemotaxis-Navier–Stokes System}}},
  doi          = {{10.1007/s00021-019-0464-z}},
  volume       = {{22}},
  year         = {{2019}},
}

@article{32487,
  author       = {{Glaznev, Roman K. and Karpov, Alexander I. and Korobeinichev, Oleg P. and Bolkisev, Andrei A. and Shaklein, Artem A. and Shmakov, Andrey G. and Paletsky, Alexander A. and Gonchikzhapov, Munko B. and Kumar, Amit}},
  issn         = {{0010-2180}},
  journal      = {{Combustion and Flame}},
  keywords     = {{General Physics and Astronomy, Energy Engineering and Power Technology, Fuel Technology, General Chemical Engineering, General Chemistry}},
  pages        = {{358--367}},
  publisher    = {{Elsevier BV}},
  title        = {{{Experimental and numerical study of polyoxymethylene (Aldrich) combustion in counterflow}}},
  doi          = {{10.1016/j.combustflame.2019.04.032}},
  volume       = {{205}},
  year         = {{2019}},
}

@article{47951,
  abstract     = {{Thin film lithium niobate has been of great interest recently, and an understanding of periodically poled thin films is crucial for both fundamental physics and device developments. Second-harmonic (SH) microscopy allows for the noninvasive visualization and analysis of ferroelectric domain structures and walls. While the technique is well understood in bulk lithium niobate, SH microscopy in thin films is largely influenced by interfacial reflections and resonant enhancements, which depend on film thicknesses and substrate materials. We present a comprehensive analysis of SH microscopy in x-cut lithium niobate thin films, based on a full three-dimensional focus calculation and accounting for interface reflections. We show that the dominant signal in backreflection originates from a copropagating phase-matched process observed through reflections, rather than direct detection of the counterpropagating signal as in bulk samples. We simulate the SH signatures of domain structures by a simple model of the domain wall as an extensionless transition from a −χ(2) to a +χ(2) region. This allows us to explain the main observation of domain structures in the thin-film geometry, and, in particular, we show that the SH signal from thin poled films allows to unambiguously distinguish areas, which are completely or only partly inverted in depth.}},
  author       = {{Rüsing, Michael and Zhao, J. and Mookherjea, S.}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{11}},
  publisher    = {{AIP Publishing}},
  title        = {{{Second harmonic microscopy of poled x-cut thin film lithium niobate: Understanding the contrast mechanism}}},
  doi          = {{10.1063/1.5113727}},
  volume       = {{126}},
  year         = {{2019}},
}

@article{47946,
  author       = {{Zhao, Jie and Rüsing, Michael and Mookherjea, Shayan}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{9}},
  publisher    = {{The Optical Society}},
  title        = {{{Optical diagnostic methods for monitoring the poling of thin-film lithium niobate waveguides}}},
  doi          = {{10.1364/oe.27.012025}},
  volume       = {{27}},
  year         = {{2019}},
}

@article{47948,
  abstract     = {{Mach-Zehnder electro-optic modulators (EOM) based on thin-film lithium niobate bonded to a silicon photonic waveguide circuit have been shown to achieve very high modulation bandwidths. Open eye-diagram measurements made in the time domain of beyond-small-signal modulation are used to support the modulation-sideband measurements in showing that such EOM’s can support high-frequency modulations well beyond 100 GHz.}},
  author       = {{Wang, Xiaoxi and Weigel, Peter O. and Zhao, Jie and Rüsing, Michael and Mookherjea, Shayan}},
  issn         = {{2378-0967}},
  journal      = {{APL Photonics}},
  keywords     = {{Computer Networks and Communications, Atomic and Molecular Physics, and Optics}},
  number       = {{9}},
  publisher    = {{AIP Publishing}},
  title        = {{{Achieving beyond-100-GHz large-signal modulation bandwidth in hybrid silicon photonics Mach Zehnder modulators using thin film lithium niobate}}},
  doi          = {{10.1063/1.5115243}},
  volume       = {{4}},
  year         = {{2019}},
}

@article{53274,
  abstract     = {{<jats:p>This paper studies the performance of improper Gaussian signaling (IGS) over a 2-user Rayleigh single-input single-output (SISO) interference channel, treating interference as noise. We assume that the receivers have perfect channel state information (CSI), while the transmitters have access to only statistical CSI. Under these assumptions, we consider a signaling scheme, which we refer to as proper/improper Gaussian signaling or PGS/IGS, where at most one user may employ IGS. For the Rayleigh fading channel model, we characterize the statistical distribution of the signal-to-interference-plus-noise ratio at each receiver and derive closed-form expressions for the ergodic rates. By adapting the powers, we characterize the Pareto boundary of the ergodic rate region for the 2-user fading IC. The ergodic transmission rates can be attained using fixed-rate codebooks and no optimization is involved. Our results show that, in the moderate and strong interference regimes, the proposed PGS/IGS scheme improves the performance with respect to the PGS scheme. Additionally, we numerically compute the ergodic rate region of the full IGS scheme when both users can employ IGS and their transmission parameters are optimized by an exhaustive search. Our results suggest that most of the Pareto optimal points for the 2-user fading IC channel are attained when either both users transmit PGS or when one transmits PGS and the other transmits maximally improper Gaussian signals and time sharing is allowed.</jats:p>}},
  author       = {{Soleymani, Mohammad and Santamaria, Ignacio and Lameiro, Christian and Schreier, Peter J.}},
  issn         = {{1099-4300}},
  journal      = {{Entropy}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{10}},
  publisher    = {{MDPI AG}},
  title        = {{{Ergodic Rate for Fading Interference Channels with Proper and Improper Gaussian Signaling}}},
  doi          = {{10.3390/e21100922}},
  volume       = {{21}},
  year         = {{2019}},
}