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SOLVENTS --- ELECTRON --- RADIATION --- POLARON --- SOLUTIONS (CHEMISTRY) --- SOLVENTS --- ELECTRON --- RADIATION --- POLARON --- SOLUTIONS (CHEMISTRY)

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The Special Issue contains theoretical and experimental works that report on studies of impurities in quantum gases, fundamental properties and universal aspects of quasiparticles and other related many-body phenomena. Particular focus is placed on the Fermi and Bose polarons. The Special Issue contains ten research articles and two reviews. M. G. Skou et al. report on the experimental observation of time dynamics of Bose polarons. Theoretical studies by H. Tajima et al., L. A. Ardila, and G. Panochko and V. Pastukhov touch upon the physics of multiple impurities, in particular, the induced impurity–impurity interactions in different spatial dimensions and the formation of multi-polaron states. G. M. Koutentakis et al. elaborate on the phenomenon of temporal orthogonality catastrophe in low dimensions. Polaritons in an electron gas are discussed by M. A. Bastarrachea-Magnani et al. M. Brooks et al. describe the emergence of anyons originating from angulons. F. Scazza et al. provide an overview of our current understanding of repulsive Bose and Fermi polarons. C. D’Errico and M. G. Tarallo explicate the effects of disorder in bosonic systems. The Special Issue also includes studies of correlated atom pairs in bosonic mixtures by O. Alon, the behavior of the three-body decay rate coefficients into shallow dimers in mass-imbalanced three-atom systems by P. Giannakeas and C. H. Greene, population and angular momentum transfer in Raman-coupled Bose–Einstein condensates by K. Mukherjee et al.

Research & information: general --- Physics --- Bose–Einstein condensate --- Laguerre–Gaussian --- Raman transition --- cold atoms --- light–matter interaction --- particle transfer --- density pattern --- polaron --- impurity --- spectroscopy of quasiparticles --- interpolaron correlations --- quantum depletion --- ultracold atoms --- Fermi degenerate gases --- Bose–Einstein condensates --- impurity dynamics --- ramsey interferometry --- polarons --- polariton --- Fermi polaron --- Landau theory --- quasiparticle interactions --- mixtures --- identical-boson pairs --- distinguishable-boson pairs --- natural geminals --- natural orbitals --- reduced density matrices --- intra-species reduced density matrices --- inter-species reduced density matrices --- fragmentation --- condensation --- infinite-particle-number limit --- harmonic-interaction models --- pair fragmentation --- Schmidt decomposition --- center-of-mass --- relative center-of-mass --- anyons --- quasiparticles --- Quantum Hall Effect --- topological states of matter --- few-body collisions --- Efimov effect --- mass-imbalanced systems --- recombination --- cold gases in optical lattices --- quantum phase transitions --- disordered systems --- Bose polaron --- pattern formation --- temporal orthogonality catastrophe --- Lee-Low-Pines transformation --- mobile and immobile impurities --- Bose polaron and bipolaron --- effective field theory approach --- induced interaction --- polaron–polaron interaction --- gas of impurities --- quantum–Monte Carlo --- Fermi polarons --- Bose polarons --- repulsive interactions --- metastable quasiparticles --- quasiparticle lifetime --- mediated interactions --- repulsive Fermi gas --- ultracold atomic mixtures

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Metals --- -Semiconductors --- -Crystalline semiconductors --- Semi-conductors --- Semiconducting materials --- Semiconductor devices --- Crystals --- Electrical engineering --- Electronics --- Solid state electronics --- Metallic elements --- Chemical elements --- Ores --- Metallurgy --- Defects --- Materials --- -Crystallography --- Powders --- Defects. --- -Defects --- Cristaux --- Défauts --- Solid state physics --- Semiconductors --- Solids --- Semiconducteurs --- Monograph --- Electric conductivity. --- Color centers --- Conduction electrons --- Crystal defects --- Dislocations interactions --- Electrical conductivity --- Holes --- Ions --- Polaron --- Radiation effects --- Thermodynamics

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The present volume “New Trends in Lithium Niobate: From Bulk to Nanocrystals” contains the materials of a Special Issue of the MDPI journal Crystals dedicated to the memory of Prof. Dr. Ortwin F. Schirmer and provides a new synopsis of his research focusing on LiNbO3. It also includes recent developments, exemplifying the continued interest in this outstanding ferroelectric, non-linear optical and holographic crystal as a workhorse for testing and realizing new ideas and applications.This book starts with reviews on intrinsic and extrinsic crystal defects in LiNbO3 of single-crystal, thin-film or nano-powder forms, studied by various optical, magnetic resonance and nuclear methods, clarifying in particular the reasons for the suppression of anion vacancy formation upon thermal reduction, mechano-chemical processing or irradiations of various types. The reviews are followed by research papers on the experimental and theoretical investigation of small polarons, together with recent results on the properties of Li(Nb,Ta)O3 mixed crystals. Among the various contributions dealing with nonlinear optical applications, papers on device development, entangled photon pair generation and thin films on the Lithium Niobate On Insulator (LNOI) platform can also be found.

Research & information: general --- lithium niobate --- small polaron hopping --- transient absorption --- mode-locked laser --- nonlinear mirror mode locking --- lithium tantalate --- crystal structure --- chemical composition --- ferroelectrics --- second harmonic generation --- lead-free piezoelectrics --- intrinsic defects --- extrinsic defects --- elemental doping --- ferromagnetism --- diluted-magnetic oxides --- LiNbO3 --- LiTaO3 --- oxide crystals --- lanthanides --- luminescence --- LNOI --- ferroelectric domains --- domain-wall conduction --- AFM --- thin film lithium niobate --- TFLN --- x-cut LN --- domain walls --- piezoresponse force microscopy --- second-harmonic generation --- Raman scattering --- electro-optics --- whispering gallery resonators --- polarons --- photorefractivity --- Marcus-Holstein’s theory --- Monte Carlo simulations --- strontium titanate --- self-trapped electrons --- oxygen vacancies --- defects --- impurity --- intrinsic defect --- paramagnetic ion --- electron paramagnetic resonance --- electron nuclear double resonance --- lithium vacancy --- lithium --- niobate --- epitaxy --- thin film --- liquid phase epitaxy --- molecular beam epitaxy --- sputtering --- pulsed laser deposition --- chemical vapor deposition --- lithium niobate-tantalate --- piezoelectric --- acoustic --- high-temperature --- sensor --- Q-factor --- BAW resonator --- parametric down-conversion --- photon-pair generation --- extended phase matching --- microring resonator --- varFDTD --- lithium tantalate thin film --- electro-optical devices --- lattice location --- radiation damage --- ion beam analysis --- hyperfine interactions --- charge localization --- lattice deformation --- optical response --- density-functional theory --- Bethe-Salpeter equation --- nanoparticles --- nanopowders --- X-ray diffraction --- Raman spectroscopy --- temperature dependence of electroconductivity --- bipolarons --- defect structure and generation --- Li diffusion --- bulk crystals --- thin films --- nanocrystals --- lithium niobate --- small polaron hopping --- transient absorption --- mode-locked laser --- nonlinear mirror mode locking --- lithium tantalate --- crystal structure --- chemical composition --- ferroelectrics --- second harmonic generation --- lead-free piezoelectrics --- intrinsic defects --- extrinsic defects --- elemental doping --- ferromagnetism --- diluted-magnetic oxides --- LiNbO3 --- LiTaO3 --- oxide crystals --- lanthanides --- luminescence --- LNOI --- ferroelectric domains --- domain-wall conduction --- AFM --- thin film lithium niobate --- TFLN --- x-cut LN --- domain walls --- piezoresponse force microscopy --- second-harmonic generation --- Raman scattering --- electro-optics --- whispering gallery resonators --- polarons --- photorefractivity --- Marcus-Holstein’s theory --- Monte Carlo simulations --- strontium titanate --- self-trapped electrons --- oxygen vacancies --- defects --- impurity --- intrinsic defect --- paramagnetic ion --- electron paramagnetic resonance --- electron nuclear double resonance --- lithium vacancy --- lithium --- niobate --- epitaxy --- thin film --- liquid phase epitaxy --- molecular beam epitaxy --- sputtering --- pulsed laser deposition --- chemical vapor deposition --- lithium niobate-tantalate --- piezoelectric --- acoustic --- high-temperature --- sensor --- Q-factor --- BAW resonator --- parametric down-conversion --- photon-pair generation --- extended phase matching --- microring resonator --- varFDTD --- lithium tantalate thin film --- electro-optical devices --- lattice location --- radiation damage --- ion beam analysis --- hyperfine interactions --- charge localization --- lattice deformation --- optical response --- density-functional theory --- Bethe-Salpeter equation --- nanoparticles --- nanopowders --- X-ray diffraction --- Raman spectroscopy --- temperature dependence of electroconductivity --- bipolarons --- defect structure and generation --- Li diffusion --- bulk crystals --- thin films --- nanocrystals

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The present volume “New Trends in Lithium Niobate: From Bulk to Nanocrystals” contains the materials of a Special Issue of the MDPI journal Crystals dedicated to the memory of Prof. Dr. Ortwin F. Schirmer and provides a new synopsis of his research focusing on LiNbO3. It also includes recent developments, exemplifying the continued interest in this outstanding ferroelectric, non-linear optical and holographic crystal as a workhorse for testing and realizing new ideas and applications.This book starts with reviews on intrinsic and extrinsic crystal defects in LiNbO3 of single-crystal, thin-film or nano-powder forms, studied by various optical, magnetic resonance and nuclear methods, clarifying in particular the reasons for the suppression of anion vacancy formation upon thermal reduction, mechano-chemical processing or irradiations of various types. The reviews are followed by research papers on the experimental and theoretical investigation of small polarons, together with recent results on the properties of Li(Nb,Ta)O3 mixed crystals. Among the various contributions dealing with nonlinear optical applications, papers on device development, entangled photon pair generation and thin films on the Lithium Niobate On Insulator (LNOI) platform can also be found.

lithium niobate --- small polaron hopping --- transient absorption --- mode-locked laser --- nonlinear mirror mode locking --- lithium tantalate --- crystal structure --- chemical composition --- ferroelectrics --- second harmonic generation --- lead-free piezoelectrics --- intrinsic defects --- extrinsic defects --- elemental doping --- ferromagnetism --- diluted-magnetic oxides --- LiNbO3 --- LiTaO3 --- oxide crystals --- lanthanides --- luminescence --- LNOI --- ferroelectric domains --- domain-wall conduction --- AFM --- thin film lithium niobate --- TFLN --- x-cut LN --- domain walls --- piezoresponse force microscopy --- second-harmonic generation --- Raman scattering --- electro-optics --- whispering gallery resonators --- polarons --- photorefractivity --- Marcus-Holstein’s theory --- Monte Carlo simulations --- strontium titanate --- self-trapped electrons --- oxygen vacancies --- defects --- impurity --- intrinsic defect --- paramagnetic ion --- electron paramagnetic resonance --- electron nuclear double resonance --- lithium vacancy --- lithium --- niobate --- epitaxy --- thin film --- liquid phase epitaxy --- molecular beam epitaxy --- sputtering --- pulsed laser deposition --- chemical vapor deposition --- lithium niobate-tantalate --- piezoelectric --- acoustic --- high-temperature --- sensor --- Q-factor --- BAW resonator --- parametric down-conversion --- photon-pair generation --- extended phase matching --- microring resonator --- varFDTD --- lithium tantalate thin film --- electro-optical devices --- lattice location --- radiation damage --- ion beam analysis --- hyperfine interactions --- charge localization --- lattice deformation --- optical response --- density-functional theory --- Bethe-Salpeter equation --- nanoparticles --- nanopowders --- X-ray diffraction --- Raman spectroscopy --- temperature dependence of electroconductivity --- bipolarons --- defect structure and generation --- Li diffusion --- bulk crystals --- thin films --- nanocrystals