The square-root operation provides a new scheme to create topological phases with unconventional spectrum properties. With the operation, insulators can support paired boundary states in two bulk gaps, and mechanism of has been generalized 2n-root insulators. In this study, we describe acoustic realization third-order quartic-root based on original three-dimensional (3D) sonic crystals. By inserting extra sites into 3D lattice, renormalize coupling parameters obtain multiple different gaps...

A Z-scheme heterojunction designed via hot injection method enables growth of nanocrystals on nanosheets. This single-domain design causes a polarization electric field within the nanosheets and an at interface. Both drive charge separation enhancing CO 2 reduction.

The energy band theory of acoustic crystal provides an important theoretical foundation for controlling the features sound fields. By utilizing flat bands, we can effectively modulate wave to realize localization and diffusion. In this work, employ artificial gauge field design a system supporting multiple leading emergence diversified localizations. Initially, use cavity resonators, linked with different connectivity based on profiles emulate coupled...

The hysteresis loop of ferroelectric materials becomes narrower with the increase in temperature due to energy barrier reduction, while coercive field level increases frequency inertia polarization reversal. These two competing effects determine limiting operation medical imaging transducers at high frequencies. We have measured 0.71PbMb1/3Nb2/3O3–0.29PbTiO3 single crystal as functions both and frequency. It was found that linearly decreases all Related theoretical analysis also performed...

The frequency dependence of the coercive field Ec in [001]c poled 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 single crystals was investigated as a function f from 0.01 Hz to 5 MHz. found be proportional [Formula: see text] predicted by Ishibashi and Orihara model, but our results showed two regimes separated at around 1.0 MHz with different β values. This change switching kinetics may due presence slower relaxation times for non-180° domain heterogeneous nucleation polar nanoregions, whose contribution...

Wave localization has been the subject of extensive investigation due to its crucial importance in both applied and fundamental research. In particular, focus shifted topologically protected states flatband states. Here, we develop an acoustic topological heterostructure with one dispersive band flatband. bandgap, there is state two defect Drawing on this heterostructure, combine three different types wave realize bound states, interface state, theory experiment. Then, examine how these...

This study investigates the temperature-tuned omnidirectional reflection (ODR) bands in a one-dimensional (1D) finite phononic crystal (PnC), formed by alternating layers of nitinol and epoxy. An analytical model, based on transfer matrix method, is developed to transmission characteristics acoustic waves including shear compressional 1D PnC. Existence criteria sensitive continuous temperature-tunability ODR nitinol/epoxy PnC are demonstrated using analyses projected-band structures spectra....

The square-root descendants of higher-order topological insulators were proposed recently, whose property is inherited from the squared Hamiltonian. Here we present a three-dimensional (3D) square-root-like sonic crystal by stacking 2D lattice in normal (z) direction. With nontrivial intralayer couplings, opened degeneracy at theK-Hdirection induces emergence multiple acoustic localized modes, i.e., extended surface states and 1D hinge states, which originate nature system. higher order can...

The square-root operation can generate novel topological phases, whose nontrivial properties are inherited from the parent Hamiltonian. Here we report acoustic realization of third-order insulators by adding additional resonators between site original diamond lattice. Due to operation, multiple localized modes appear in doubled bulk gaps. polarizations tight-binding models employed reveal feature higher-order states. By tuning coupling strength, find emergence corner states gaps on...

Pb ( Zr , Ti ) O 3 (PZT)-based ternary compound thin films, 0.06PMnN-0.94PZT(50/50) (PMnN-PZT), are deposited on Si-based heterostructures by rf magnetron sputtering system. The intrinsic PZT(50/50) films also the same kind of substrates for comparison. PMnN-PZT show similar polycrystalline structures as those PZT with highly (111) oriented perovskite phase. excellent piezoelectricity and ferroelectricity which distinctly better than prepared deposition conditions. Besides, cantilevers...

Polarization switching and associated electromechanical property changes at 3.0 MHz were investigated with without a direct current (dc) bias for [001]c poled 0.70Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 single crystal. The results showed that the coercive field under bipolar pulse is 2.75 times as large conventional defined Ec (2.58 kV/cm 0.1 Hz), dc can further enlarge driving field. Our point to an innovative transducer operating mechanism high frequencies since one could drive crystal much larger...

The dynamic hysteresis scaling behaviors of a [001]c poled Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-0.28PT) single crystal have been explored as function amplitude E0 and frequency f the external electric field in temperature region from 298 K to 388 K. various properties for parameters such area <A>, coercive Ec, saturation polarization Ps vs T, were characterized among different region. It was discovered that has critical influence on phase transformation characteristics PMN-0.28PT crystal,...

The control of topological sound transport has attracted increasing attention from researchers. Topological interface states, which have pseudospin-momentum-locked dispersions, render backscattering immune against defects. Here we report on the experimental observation energy transfer through distinct passages, whose existence and elimination are attributed to coupling decoupling between states. phenomenon is elucidated well using interference theory wavelength, including propagation...

A new hybrid inversion method for depth profiling reconstruction of thermal conductivities inhomogeneous solids is proposed based on multilayer quadrupole formalism waves, particle swarm optimization and sequential quadratic programming. The simulations several conductivity profiles are performed to evaluate the applicability method. numerical demonstrate that precision insensitivity noise very satisfactory.

A three-dimensional thermo-mechanical coupled finite element model is built up to simulate the phenomena of dynamical contact and frictional heating crack faces when plate containing excited by high-intensity ultrasonic pulses. In model, high-power transducer modeled using a piezoelectric thermal-analogy method, interaction between both contact-impact theory. simulations, taking place at quantitatively calculated thermal-structural coupling analysis, especially, influences acoustic chaos...