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Anomalous frozen evanescent phonons.
Nat Commun
October 2024
Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.
Evanescent Bloch waves are eigensolutions of spatially periodic problems for complex-valued wavenumbers at finite frequencies, corresponding to solutions that oscillate in time and space and that exponentially decay in space. Such evanescent waves are ubiquitous in optics, plasmonics, elasticity, and acoustics. In the limit of zero frequency, the wave "freezes" in time.
View Article and Find Full Text PDFSynthesis, nanocrystalline morphology, lattice dynamics and nonlinear optics of mesoporous SiO&LiNbO nanocomposite.
Sci Rep
October 2024
Faculty of Electrical Engineering, Częstochowa University of Technology, Al. Armii Krajowej 17, 42-200, Częstochowa, Poland.
We demonstrate a hybrid nanocomposite combining mesoporous silica, p , as a host medium and guest lithium niobate nanocrystals embedded into tubular silica nanochannels by calcination of the precursor mixed solution of lithium and niobium salts. High-resolution transmission electron microscopy, X-ray diffraction and Raman scattering techniques reveal trigonal nanocrystals within the p nanochannels, indicating their random texture morphology. Annealing at high temperatures ( 950 C) during calcination also leads to partial crystallization of the p matrix with the formation of trigonal - nanocrystals.
View Article and Find Full Text PDFAnderson Localization Transition in Disordered Hyperbolic Lattices.
Phys Rev Lett
August 2024
Theoretical Physics Institute, University of Alberta, Edmonton, Alberta T6G 2E1, Canada and Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada.
We study Anderson localization in disordered tight-binding models on hyperbolic lattices. Such lattices are geometries intermediate between ordinary two-dimensional crystalline lattices, which localize at infinitesimal disorder, and Bethe lattices, which localize at strong disorder. Using state-of-the-art computational group theory methods to create large systems, we approximate the thermodynamic limit through appropriate periodic boundary conditions and numerically demonstrate the existence of an Anderson localization transition on the {8,3} and {8,8} lattices.
View Article and Find Full Text PDFMean-field theory of chaotic insect swarms.
Phys Rev E
June 2023
Gregorio Millán Institute for Fluid Dynamics, Nanoscience and Industrial Mathematics, Universidad Carlos III de Madrid, 28911 Leganés, Spain and Department of Mathematics, Universidad Carlos III de Madrid, 28911 Leganés, Spain.
The harmonically confined Vicsek model displays qualitative and quantitative features observed in natural insect swarms. It exhibits a scale-free transition between single and multicluster chaotic phases. Finite-size scaling indicates that this unusual phase transition occurs at zero confinement [Phys.
View Article and Find Full Text PDFAsymmetric coupling induces two-directional reentrance transition in three-lane exclusion process.
Phys Rev E
April 2023
Department of Mathematics, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India.
Inspired by vehicular traffic phenomena, we study a three-lane open totally asymmetric simple exclusion process with both-sided lane switching in the companionship of Langmuir kinetics. We calculate the phase diagrams, density profiles, and phase transitions through mean-field theory and successfully validate these findings with Monte Carlo simulation results. It has been found that both the qualitative and quantitative topology of phase diagrams crucially rely on the ratio of lane-switching rates called coupling strength.
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