@article{47964,
  abstract     = {{In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductance measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductance (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current–voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner.}},
  author       = {{Beyreuther, Elke and Ratzenberger, Julius and Roeper, Matthias and Kirbus, Benjamin and Rüsing, Michael and Ivleva, Liudmila I. and Eng, Lukas M.}},
  issn         = {{2073-4352}},
  journal      = {{Crystals}},
  keywords     = {{Inorganic Chemistry, Condensed Matter Physics, General Materials Science, General Chemical Engineering}},
  number       = {{7}},
  publisher    = {{MDPI AG}},
  title        = {{{Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals}}},
  doi          = {{10.3390/cryst11070780}},
  volume       = {{11}},
  year         = {{2021}},
}

@article{47973,
  abstract     = {{Thin-film lithium niobate (TFLN) in the form of x- or z-cut lithium-niobate-on-insulator has attracted considerable interest as a very promising and novel platform for developing integrated optoelectronic (nano)devices and exploring fundamental research. Here, we investigate the coherent interaction length lc of optical second-harmonic generation (SHG) microscopy in such samples, that are purposely prepared into a wedge shape, in order to elegantly tune the geometrical confinement from bulk thicknesses down to approximately 50 nm. SHG microscopy is a very powerful and non-invasive tool for the investigation of structural properties in the biological and solid-state sciences, especially for visualizing and analyzing ferroelectric domains and domain walls. However, unlike in bulk lithium niobate (LN), SHG microscopy in TFLN is impacted by interfacial reflections and resonant enhancement, both of which rely on film thickness and substrate material. In this paper, we show that the dominant SHG contribution measured on TFLN in backreflection is the co-propagating phase-matched SHG signal and not the counter-propagating SHG portion as is the case for bulk LN samples. Moreover, lc depends on the incident pump laser wavelength (sample dispersion) but also on the numerical aperture of the focussing objective in use. These experimental findings on x- and z-cut TFLN are excellently backed up by our advanced numerical simulations.}},
  author       = {{Amber, Zeeshan H. and Kirbus, Benjamin and Eng, Lukas M. and Rüsing, Michael}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{13}},
  pages        = {{133102}},
  publisher    = {{AIP Publishing}},
  title        = {{{Quantifying the coherent interaction length of second-harmonic microscopy in lithium niobate confined nanostructures}}},
  doi          = {{10.1063/5.0058996}},
  volume       = {{130}},
  year         = {{2021}},
}

@article{47974,
  abstract     = {{Domain walls (DWs) in ferroelectric (FE) and multiferroic materials possess an ever-growing potential as integrated functional elements, for instance in optoelectronic nanodevices. Mandatory, however, is the profound knowledge of the local-scale electronic and optical properties, especially at DWs that are still incompletely characterized to date. Here, we quantify the refractive index of individual FE DWs in periodically-poled LiNbO<jats:sub>3</jats:sub> (PPLN) single crystals. When applying polarization-sensitive optical coherence tomography (PS-OCT) at 1300 nm using circular light polarization, we are able to probe the relevant electro-optical properties close to and at the DWs, including also their ordinary and extraordinary contributions. When comparing to numerical calculations, we conclude that the DW signals recorded for ordinary and extraordinary polarization stem from an increased refractive index of at least Δn &gt; 2·10<jats:sup>−3</jats:sup> that originates from a tiny region of &lt; 30 nm in width. PS-OCT hence provides an extremely valuable tool to decipher and quantify subtle changes of refractive index profiles for both inorganic and biomedical nanomaterial systems.}},
  author       = {{Golde, Jonas and Rüsing, Michael and Rix, Jan and Eng, Lukas M. and Koch, Edmund}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{21}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Quantifying the refractive index of ferroelectric domain walls in periodically poled LiNbO3 single crystals by polarization-sensitive optical coherence tomography}}},
  doi          = {{10.1364/oe.432810}},
  volume       = {{29}},
  year         = {{2021}},
}

@article{53086,
  author       = {{Zhang, Hao and Kaczmarek, Dennis and Rudolph, Charlotte and Schmitt, Steffen and Gaiser, Nina and Oßwald, Patrick and Bierkandt, Thomas and Kasper, Tina and Atakan, Burak and Kohse-Höinghaus, Katharina}},
  issn         = {{0010-2180}},
  journal      = {{Combustion and Flame}},
  keywords     = {{General Physics and Astronomy, Energy Engineering and Power Technology, Fuel Technology, General Chemical Engineering, General Chemistry}},
  publisher    = {{Elsevier BV}},
  title        = {{{Dimethyl ether (DME) and dimethoxymethane (DMM) as reaction enhancers for methane: Combining flame experiments with model-assisted exploration of a polygeneration process}}},
  doi          = {{10.1016/j.combustflame.2021.111863}},
  volume       = {{237}},
  year         = {{2021}},
}

@article{32006,
  author       = {{Guillarmou, Colin and Küster, Benjamin}},
  issn         = {{1424-0637}},
  journal      = {{Annales Henri Poincaré}},
  keywords     = {{Mathematical Physics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics}},
  number       = {{11}},
  pages        = {{3565--3617}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Spectral Theory of the Frame Flow on Hyperbolic 3-Manifolds}}},
  doi          = {{10.1007/s00023-021-01068-7}},
  volume       = {{22}},
  year         = {{2021}},
}

@article{37936,
  author       = {{Pelucchi, Emanuele and Fagas, Giorgos and Aharonovich, Igor and Englund, Dirk and Figueroa, Eden and Gong, Qihuang and Hannes, Hübel and Liu, Jin and Lu, Chao-Yang and Matsuda, Nobuyuki and Pan, Jian-Wei and Schreck, Florian and Sciarrino, Fabio and Silberhorn, Christine and Wang, Jianwei and Jöns, Klaus}},
  issn         = {{2522-5820}},
  journal      = {{Nature Reviews Physics}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{3}},
  pages        = {{194--208}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{The potential and global outlook of integrated photonics for quantum technologies}}},
  doi          = {{10.1038/s42254-021-00398-z}},
  volume       = {{4}},
  year         = {{2021}},
}

@article{35326,
  abstract     = {{<jats:p>Thermostable compartmentalized sodium-water sites through intercalated γ-aminopropyl-dimethyl-ethoxy silane in synthetic hectorite.</jats:p>}},
  author       = {{Keil, Waldemar and Zhao, Kai and Oswald, Arthur and Bremser, Wolfgang and Schmidt, Claudia and Hintze-Bruening, Horst}},
  issn         = {{1463-9076}},
  journal      = {{Physical Chemistry Chemical Physics}},
  keywords     = {{Physical and Theoretical Chemistry, General Physics and Astronomy}},
  number       = {{1}},
  pages        = {{477--487}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Thermostable water reservoirs in the interlayer space of a sodium hectorite clay through the intercalation of γ-aminopropyl(dimethyl)ethoxysilane in toluene}}},
  doi          = {{10.1039/d1cp03321b}},
  volume       = {{24}},
  year         = {{2021}},
}

@article{41817,
  abstract     = {{<jats:p>Pseudo isocyanine chloride monomers equilibrate with H-oligomers and, separated by a threshold, with H-oligomers and fiber-like J-aggregates. The mechanism and thermodynamics of J-aggregate formation is interpreted with the concept of chain growth.</jats:p>}},
  author       = {{Hämisch, Benjamin and Huber, Klaus}},
  issn         = {{1744-683X}},
  journal      = {{Soft Matter}},
  keywords     = {{Condensed Matter Physics, General Chemistry}},
  number       = {{35}},
  pages        = {{8140--8152}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Mechanism and equilibrium thermodynamics of H- and J-aggregate formation from pseudo isocyanine chloride in water}}},
  doi          = {{10.1039/d1sm00979f}},
  volume       = {{17}},
  year         = {{2021}},
}

@article{29780,
  abstract     = {{<jats:p>A central tenet of theoretical cryptography is the study of the minimal assumptions required to implement a given cryptographic primitive. One such primitive is the one-time memory (OTM), introduced by Goldwasser, Kalai, and Rothblum [CRYPTO 2008], which is a classical functionality modeled after a non-interactive 1-out-of-2 oblivious transfer, and which is complete for one-time classical and quantum programs. It is known that secure OTMs do not exist in the standard model in both the classical and quantum settings. Here, we propose a scheme for using quantum information, together with the assumption of stateless (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>i</mml:mi><mml:mo>.</mml:mo><mml:mi>e</mml:mi><mml:mo>.</mml:mo></mml:math>, reusable) hardware tokens, to build statistically secure OTMs. Via the semidefinite programming-based quantum games framework of Gutoski and Watrous [STOC 2007], we prove security for a malicious receiver making at most 0.114<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>n</mml:mi></mml:math> adaptive queries to the token (for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>n</mml:mi></mml:math> the key size), in the quantum universal composability framework, but leave open the question of security against a polynomial amount of queries. Compared to alternative schemes derived from the literature on quantum money, our scheme is technologically simple since it is of the "prepare-and-measure" type. We also give two impossibility results showing certain assumptions in our scheme cannot be relaxed.</jats:p>}},
  author       = {{Broadbent, Anne and Gharibian, Sevag and Zhou, Hong-Sheng}},
  issn         = {{2521-327X}},
  journal      = {{Quantum}},
  keywords     = {{Physics and Astronomy (miscellaneous), Atomic and Molecular Physics, and Optics}},
  publisher    = {{Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften}},
  title        = {{{Towards Quantum One-Time Memories from Stateless Hardware}}},
  doi          = {{10.22331/q-2021-04-08-429}},
  volume       = {{5}},
  year         = {{2021}},
}

@article{37338,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Methylammonium lead iodide perovskite (MAPbI<jats:sub>3</jats:sub>) is renowned for an impressive power conversion efficiency rise and cost-effective fabrication for photovoltaics. In this work, we demonstrate that polycrystalline MAPbI<jats:sub>3</jats:sub>s undergo drastic changes in optical properties at moderate field strengths with an ultrafast response time, via transient Wannier Stark localization. The distinct band structure of this material - the large lattice periodicity, the narrow electronic energy bandwidths, and the coincidence of these two along the same high-symmetry direction – enables relatively weak fields to bring this material into the Wannier Stark regime. Its polycrystalline nature is not detrimental to the optical switching performance of the material, since the least dispersive direction of the band structure dominates the contribution to the optical response, which favors low-cost fabrication. Together with the outstanding photophysical properties of MAPbI<jats:sub>3</jats:sub>, this finding highlights the great potential of this material in ultrafast light modulation and novel photonic applications.</jats:p>}},
  author       = {{Berghoff, Daniel and Bühler, Johannes and Bonn, Mischa and Leitenstorfer, Alfred and Meier, Torsten and Kim, Heejae}},
  issn         = {{2041-1723}},
  journal      = {{Nature Communications}},
  keywords     = {{General Physics and Astronomy, General Biochemistry, Genetics and Molecular Biology, General Chemistry, Multidisciplinary}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Low-field onset of Wannier-Stark localization in a polycrystalline hybrid organic inorganic perovskite}}},
  doi          = {{10.1038/s41467-021-26021-4}},
  volume       = {{12}},
  year         = {{2021}},
}

@article{44042,
  abstract     = {{<jats:p>The relativistic wave equations determine the dynamics of quantum fields in the context of quantum field theory. One of the conventional tools for dealing with the relativistic bound state problem is the Klein-Fock-Gordon equation. In this work, using a developed scheme, we present how to surmount the centrifugal part and solve the modified Klein-Fock-Gordon equation for the linear combination of Hulthén and Yukawa potentials. In particular, we show that the relativistic energy eigenvalues and corresponding radial wave functions are obtained from supersymmetric quantum mechanics by applying the shape invariance concept. Here, both scalar potential conditions, which are whether equal and nonequal to vector potential, are considered in the calculation. The energy levels and corresponding normalized eigenfunctions are represented as a recursion relation regarding the Jacobi polynomials for arbitrary <jats:inline-formula>
                     <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1">
                        <mi>l</mi>
                     </math>
                  </jats:inline-formula> states. Beyond that, a closed form of the normalization constant of the wave functions is found. Furthermore, we state that the energy eigenvalues are quite sensitive with potential parameters for the quantum states. The nonrelativistic and relativistic results obtained within SUSY QM overlap entirely with the results obtained by ordinary quantum mechanics, and it displays that the mathematical implementation of SUSY quantum mechanics is quite perfect.</jats:p>}},
  author       = {{Ahmadov, A. I. and Aslanova, S. M. and Orujova, M. Sh. and Badalov, S. V.}},
  editor       = {{Vagnozzi, Sunny}},
  issn         = {{1687-7365}},
  journal      = {{Advances in High Energy Physics}},
  keywords     = {{Nuclear and High Energy Physics}},
  pages        = {{1--11}},
  publisher    = {{Hindawi Limited}},
  title        = {{{Analytical Bound State Solutions of the Klein-Fock-Gordon Equation for the Sum of Hulthén and Yukawa Potential within SUSY Quantum Mechanics}}},
  doi          = {{10.1155/2021/8830063}},
  volume       = {{2021}},
  year         = {{2021}},
}

@article{40244,
  author       = {{Meier, Lukas and Schmidt, Wolf Gero}},
  issn         = {{0370-1972}},
  journal      = {{physica status solidi (b)}},
  keywords     = {{Condensed Matter Physics, Electronic, Optical and Magnetic Materials}},
  number       = {{1}},
  publisher    = {{Wiley}},
  title        = {{{GaInP/AlInP(001) Interfaces from Density Functional Theory}}},
  doi          = {{10.1002/pssb.202100462}},
  volume       = {{259}},
  year         = {{2021}},
}

@article{37334,
  abstract     = {{<jats:p>Uniaxial anisotropy in nonlinear birefringent crystals limits the efficiency of nonlinear optical interactions and breaks the spatial symmetry of light generated in the parametric down-conversion (PDC) process. Therefore, this effect is usually undesirable and must be compensated for. However, high gain may be used to overcome the destructive role of anisotropy in order to generate bright two-mode correlated twin-beams. In this work, we provide a rigorous theoretical description of the spatial properties of bright squeezed light in the presence of strong anisotropy. We investigate a single crystal and a system of two crystals with an air gap (corresponding to a nonlinear SU(1,1) interferometer) and demonstrate the generation of bright correlated twin-beams in such configurations at high gain due to anisotropy. We explore the mode structure of the generated light and show how anisotropy, together with crystal spacing, can be used for radiation shaping.</jats:p>}},
  author       = {{Riabinin, M. and Sharapova, Polina and Meier, Torsten}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{14}},
  pages        = {{21876--21890}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Bright correlated twin-beam generation and radiation shaping in high-gain parametric down-conversion with anisotropy}}},
  doi          = {{10.1364/oe.424977}},
  volume       = {{29}},
  year         = {{2021}},
}

@article{41511,
  author       = {{Hein, Maxwell 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       = {{7}},
  pages        = {{703--716}},
  publisher    = {{Wiley}},
  title        = {{{Additively processed TiAl6Nb7 alloy for biomedical applications}}},
  doi          = {{10.1002/mawe.202000288}},
  volume       = {{52}},
  year         = {{2021}},
}

@article{41516,
  author       = {{Tillmann, Wolfgang and Lopes Dias, Nelson Filipe and Franke, Carlo and Kokalj, David and Stangier, Dominic and Filor, Viviane and Mateus-Vargas, Rafael Hernán and Oltmanns, Hilke and Kietzmann, Manfred and Meißner, Jessica and Hein, Maxwell and Pramanik, Sudipta and Hoyer, Kay-Peter and Schaper, Mirko and Nienhaus, Alexander and Thomann, Carl Arne and Debus, Jörg}},
  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 biocompatibility of Ag-containing amorphous carbon films deposited onto Ti6Al4V}}},
  doi          = {{10.1016/j.surfcoat.2021.127384}},
  volume       = {{421}},
  year         = {{2021}},
}

@article{41512,
  author       = {{Andreiev, Anatolii and Hoyer, Kay-Peter and Dula, Dimitri and Hengsbach, Florian and Grydin, Olexandr and Frolov, Yaroslav and Schaper, Mirko}},
  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        = {{{Laser beam melting of functionally graded materials with application-adapted tailoring of magnetic and mechanical performance}}},
  doi          = {{10.1016/j.msea.2021.141662}},
  volume       = {{822}},
  year         = {{2021}},
}

@article{41509,
  author       = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Schaper, Mirko}},
  issn         = {{0167-577X}},
  journal      = {{Materials Letters}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}},
  publisher    = {{Elsevier BV}},
  title        = {{{Bioresorbable AgCe and AgCeLa alloys for adapted Fe-based implants}}},
  doi          = {{10.1016/j.matlet.2021.130890}},
  volume       = {{306}},
  year         = {{2021}},
}

@article{34673,
  author       = {{Black, Tobias and Fuest, Mario and Lankeit, Johannes}},
  issn         = {{0044-2275}},
  journal      = {{Zeitschrift für angewandte Mathematik und Physik}},
  keywords     = {{Applied Mathematics, General Physics and Astronomy, General Mathematics}},
  number       = {{3}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Relaxed parameter conditions for chemotactic collapse in logistic-type parabolic–elliptic Keller–Segel systems}}},
  doi          = {{10.1007/s00033-021-01524-8}},
  volume       = {{72}},
  year         = {{2021}},
}

@article{34675,
  author       = {{Black, Tobias and Wu, Chunyan}},
  issn         = {{0044-2275}},
  journal      = {{Zeitschrift für angewandte Mathematik und Physik}},
  keywords     = {{Applied Mathematics, General Physics and Astronomy, General Mathematics}},
  number       = {{4}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Prescribed signal concentration on the boundary: Weak solvability in a chemotaxis-Stokes system with proliferation}}},
  doi          = {{10.1007/s00033-021-01565-z}},
  volume       = {{72}},
  year         = {{2021}},
}

@article{46011,
  author       = {{Zhang, Dawei and Sando, Daniel and Pan, Ying and Sharma, Pankaj and Seidel, Jan}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{1}},
  publisher    = {{AIP Publishing}},
  title        = {{{Robust ferroelectric polarization retention in harsh environments through engineered domain wall pinning}}},
  doi          = {{10.1063/5.0029620}},
  volume       = {{129}},
  year         = {{2021}},
}