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Статті в журналах з теми "Resonant; lattice"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

Han, Aoxue, Colm Dineen, Viktoriia E. Babicheva, and Jerome V. Moloney. "Second harmonic generation in metasurfaces with multipole resonant coupling." Nanophotonics 9, no. 11 (July 5, 2020): 3545–56. http://dx.doi.org/10.1515/nanoph-2020-0193.

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AbstractWe report on the numerical demonstration of enhanced second harmonic generation (SHG) originating from collective resonances in plasmonic nanoparticle arrays. The nonlinear optical response of the metal nanoparticles is modeled by employing a hydrodynamic nonlinear Drude model implemented into Finite-Difference Time-Domain (FDTD) simulations, and effective polarizabilities of nanoparticle multipoles in the lattice are analytically calculated at the fundamental wavelength by using a coupled dipole–quadrupole approximation. Excitation of narrow collective resonances in nanoparticle arrays with electric quadrupole (EQ) and magnetic dipole (MD) resonant coupling leads to strong linear resonance enhancement. In this work, we analyze SHG in the vicinity of the lattice resonance corresponding to different nanoparticle multipoles and explore SHG efficiency by varying the lattice periods. Coupling of electric quadrupole and magnetic dipole in the nanoparticle lattice indicates symmetry breaking and the possibility of enhanced SHG under these conditions. By varying the structure parameters, we can change the strength of electric dipole (ED), EQ, and MD polarizabilities, which can be used to control the linewidth and magnitude of SHG emission in plasmonic lattices. Engineering of lattice resonances and associated magnetic dipole resonant excitations can be used for spectrally narrow nonlinear response as the SHG can be enhanced and controlled by higher multipole excitations and their lattice resonances. We show that both ED and EQ–MD lattice coupling contribute to SHG, but the presence of strong EQ–MD coupling is important for spectrally narrow SHG and, in our structure, excitation of narrow higher-order multipole lattice resonances results in five times enhancement.

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2

Xiong, Lei, Hongwei Ding, Yuanfu Lu, and Guangyuan Li. "Active tuning of resonant lattice Kerker effect." Journal of Physics D: Applied Physics 55, no. 18 (February 10, 2022): 185106. http://dx.doi.org/10.1088/1361-6463/ac4ec5.

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Abstract The Kerker effect has been generalized in nanophotonics and meta-optics, and has recently been of great interest by relating it to various fascinating functionalities such as scattering management and perfect transmission, reflection or absorption. One of the most interesting generalizations is the resonant lattice Kerker effect in periodic nanostructures. However, its active tuning has not been explored yet. Here, we report, for the first time, the active control of the resonant lattice Kerker effect in periodic Ge2Se2Te5 nanodisks. By changing the crystalline fraction, we show that the electric dipole surface lattice resonance (ED-SLR), the magnetic dipole resonance (MDR), and thus the resonant lattice Kerker effect are all red-shifted. We therefore realize the transition from the ED-SLR to the resonant lattice Kerker effect, which enables multilevel tuning of reflection, transmission and absorption with modulation depths above 86%. Taking advantage of the MDR redshifts, we also observe broadband and multilevel tuning of transmissions with modulation depth of 87% over a broadband range of 588 nm. Our work establishes a new path for designing high-performance active nanophotonic devices.

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3

Briceño, Raúl A. "Resonances from lattice QCD." EPJ Web of Conferences 175 (2018): 01016. http://dx.doi.org/10.1051/epjconf/201817501016.

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The spectrum of hadron is mainly composed as shortly-lived states (resonance) that decay onto two or more hadrons. These resonances play an important role in a variety of phenomenologically significant processes. In this talk, I give an overview on the present status of a rigorous program for studying of resonances and their properties using lattice QCD. I explain the formalism needed for extracting resonant amplitudes from the finite-volume spectra. From these one can extract the masses and widths of resonances. I present some recent examples that illustrate the power of these ideas. I then explain similar formalism that allows for the determination of resonant electroweak amplitudes from finite-volume matrix elements. I use the recent calculation of the πγ* → ππ amplitude as an example illustrating the power of this formalism. From such amplitudes one can determine transition form factors of resonances. I close by reviewing on-going efforts to generalize these ideas to increasingly complex reactions and I then give a outlook of the field.

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4

LIU, M., L. H. WEN, L. SHE, A. X. CHEN, H. W. XIONG, and M. S. ZHAN. "SPLITTING AND TRAPPING OF BOSE-CONDENSED GASES IN MULTI-WELLS." Modern Physics Letters B 19, no. 06 (March 20, 2005): 303–12. http://dx.doi.org/10.1142/s0217984905008244.

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For the Bose-condensed gas in a one-dimensional optical lattice, several far-off resonant laser beams are used to split and trap the matter wavepacket after switching off both the magnetic trap and optical lattices. In the presence of two far-off resonant laser beams which are not symmetric about the centre of the matter wavepacket, we propose an experimental scheme to observe the collision between two side peaks after switching off the magnetic trap and optical lattice. We also discuss an experimental scheme to realize a coherent splitting and trapping of the matter wavepacket which has potential application in atom optics.

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5

Lian, Ziyang, Shan Jiang, Hongping Hu, Longxiang Dai, Xuedong Chen, and Wei Jiang. "An Enhanced Plane Wave Expansion Method to Solve Piezoelectric Phononic Crystal with Resonant Shunting Circuits." Shock and Vibration 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/4015363.

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An enhanced plane wave expansion (PWE) method is proposed to solve piezoelectric phononic crystal (PPC) connected with resonant shunting circuits (PPC-C), which is named as PWE-PPC-C. The resonant shunting circuits can not only bring about the locally resonant (LR) band gap for the PPC-C but also conveniently tune frequency and bandwidth of band gaps through adjusting circuit parameters. However, thus far, more than one-dimensional PPC-C has been studied just by Finite Element method. Compared with other methods, the PWE has great advantages in solving more than one-dimensional PC as well as various lattice types. Nevertheless, the conventional PWE cannot accurately solve coupling between the structure and resonant shunting circuits of the PPC-C since only taking one-way coupling from displacements to electrical parameters into consideration. A two-dimensional PPC-C model of orthorhombic lattice is established to demonstrate the whole solving process of PWE-PPC-C. The PWE-PPC-C method is validated by Transfer Matrix method as well as Finite Element method. The dependence of band gaps on circuit parameters has been investigated in detail by PWE-PPC-C. Its advantage in solving various lattice types is further illustrated by calculating the PPC-C of triangular and hexagonal lattices, respectively.

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6

Tran, Brian, Karl A. Fisher, Jenny Wang, Chuck Divin, and Gabriel Balensiefer. "Resonant ultrasound spectroscopy measurement and modeling of additively manufactured octet truss lattice cubes." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A131. http://dx.doi.org/10.1121/10.0015784.

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Advancement of additive manufacturing technological readiness requires high throughput evaluation capabilities that can keep pace with the development of complex parts. Resonant ultrasound spectroscopy (RUS) is an acoustic technique that provides rapid holistic probing of a part by tracking fundamental mechanical resonance modes. In this work, the RUS responses of additively manufactured Ti-5553 octet truss lattice cubes were characterized using experimental measurements and three-dimensional finite element models. Varying percentages of missing struts were designed into the lattices as controlled defects and were verified using X-ray computed tomography. Experimental measurements of density and Young’s modulus were treated as input parameters in a homogenous anisotropic continuum model. The continuum model was compared with experimental RUS measurements, thus evaluating the potential for a simplified approximation of the octet truss lattice. [This work was supported by US DOE LLNL-LDRD 20-SI-001 and was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.]

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7

Titvinidze, I., M. Snoek, and W. Hofstetter. "Resonant superfluidity in an optical lattice." New Journal of Physics 12, no. 6 (June 28, 2010): 065030. http://dx.doi.org/10.1088/1367-2630/12/6/065030.

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8

Caciuffo, Roberto, and Gerard H. Lander. "X-ray synchrotron radiation studies of actinide materials." Journal of Synchrotron Radiation 28, no. 6 (November 1, 2021): 1692–708. http://dx.doi.org/10.1107/s1600577521009413.

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By reviewing a selection of X-ray diffraction (XRD), resonant X-ray scattering (RXS), X-ray magnetic circular dichroism (XMCD), resonant and non-resonant inelastic scattering (RIXS, NIXS), and dispersive inelastic scattering (IXS) experiments, the potential of synchrotron radiation techniques in studying lattice and electronic structure, hybridization effects, multipolar order and lattice dynamics in actinide materials is demonstrated.

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9

CHEN, Shi, Hang LIU, ChengHui WANG, and ZhongYu GUO. "Lattice-resonant phononic crystals with subwavelength gaps." SCIENTIA SINICA Physica, Mechanica & Astronomica 51, no. 11 (January 1, 2021): 114312. http://dx.doi.org/10.1360/sspma-2020-0495.

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10

Bolton, Daniel R., Raúl A. Briceño, and David J. Wilson. "Connecting physical resonant amplitudes and lattice QCD." Physics Letters B 757 (June 2016): 50–56. http://dx.doi.org/10.1016/j.physletb.2016.03.043.

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11

BHATTACHERJEE, ARANYABHUTI. "ELECTRON SHELVING INDUCED SQUEEZING IN FLUORESCENT LIGHT EMITTED BY COLD 4He ATOMS IN AN OPTICAL LATTICE: COHERENT CONTROL BY A WEAK AXIAL MAGNETIC FIELD." Modern Physics Letters B 15, no. 20 (August 30, 2001): 847–55. http://dx.doi.org/10.1142/s0217984901002609.

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We report theoretical calculations on the effect of polarization gradient, atomic motion and an axial magnetic field on quantum noise reduction in the resonant fluorescence emitted by a cloud of cold Helium atoms in an optical lattice. The polarization gradient induces squeezing of the electromagnetic field at selected points on the optical lattice, together with a dark resonance in the emitted fluorescence, the origin of which is traced back to electron shelving. We find that the localization of the atoms in the optical lattice destroys squeezing, but can be recovered in the presence of an axial magnetic field.

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12

Seiner, Hanus, and Petr Sedlak. "Resonant ultrasound spectroscopy for characterization of lattice instability of shape memory alloys." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A130. http://dx.doi.org/10.1121/10.0015781.

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Shape memory alloys (SMAs) are materials able to undergo reversible displacive transitions between different crystal lattices. This ability is reflected by the elastic constants of the individual phases, as certain combinations of these constants exhibit anomalous softening when the crystal approaches the transformation temperature or when the lattice is destabilized by the presence of mobile interfaces. The lecture will summarize the advantages of using resonant ultrasound spectroscopy (RUS), and in particular its contact-less laser-based modification, for detecting and evaluating these elastic anomalies. Three recently studied cases will be discussed: i) single crystals of ferromagnetic shape memory alloys in which the instability-induced softening couples with magnetoelasticity; ii) fine regular laminates in tetragonal martensitic lattices in which the soft combinations of the elastic constants have to be calculated from the effective elastic response of the microstructure; iii) modulated crystals with highly mobile interfaces that act as strongly-nonlinear mechanical oscillators and where the properties of the interfaces can be achieved by analyzing the non-linearity.

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13

Li, Bing, Yongquan Liu, and Kwek-Tze Tan. "A novel meta-lattice sandwich structure for dynamic load mitigation." Journal of Sandwich Structures & Materials 21, no. 6 (August 23, 2017): 1880–905. http://dx.doi.org/10.1177/1099636217727144.

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In this article, a novel meta-lattice sandwich structure is proposed and designed for impulsive wave attenuation and dynamic load mitigation. This original meta-lattice truss core sandwich structure has a similar configuration as a normal lattice sandwich structure, except that its truss bars are composed of meta-lattice truss unit cells. The design philosophy of locally resonant elastic metamaterials is integrated into the meta-lattice truss unit cell whereby a relatively heavier metal core (the resonator) is coated with a soft material layer (rubber coat), which is then connected to an outer shell. Based on this unique construction, several frequency band gaps are created by the locally resonant behavior of the specially designed resonators, in which stress waves within the stopping band gaps are not able to propagate through the material. Analytical spring-mass model is employed to predict the frequency band gaps, whereas numerical finite element simulation is utilized to model the continuum structure under impulsive loadings. The impact response, wave attenuation, and stress distribution contours between normal sandwich structure and meta-lattice sandwich structure are compared and analyzed. The mechanisms of wave mitigation and energy absorption by the internal resonators are thoroughly investigated. Results evidently show that the proposed meta-lattice sandwich structure has a more superior ability for impact mitigation and higher kinetic energy absorption capability due to the locally resonant behavior of the internal resonators.

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14

Li, Yan, Xue Zhao, Xiao-li Li, and Hai-wei Fu. "Stress and Temperature Sensitivity of Photonic Crystals Resonant Cavity." Scientific World Journal 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/805470.

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The temperature and stress characteristic of photonic band gap structure resonant cavities with square and graphite lattice have been studied by finite-difference time-domain method. The results show that the resonant cavities, both square and graphite lattice, have more and more resonant frequency with the cavity enlarging. And the curves between the resonant frequency and stress have better linearity. When the cavity enlarges enough, the curve between resonant frequency and temperature will become sectionalized line from nonlinear curve. Especially, the temperature sensitivity will be descending as the cavity is enlarging. Nevertheless, once some structures are put in the center of the cavity, the temperature sensitivity will be rising fast for this kind of cavity. Obviously, this character is convenient for us to achieve the specification measurement for temperature and stress.

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15

Tan, Plum, and Singh. "Surface Lattice Resonances in THz Metamaterials." Photonics 6, no. 3 (June 26, 2019): 75. http://dx.doi.org/10.3390/photonics6030075.

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Diffraction of light in periodic structures is observed in a variety of systems including atoms, solid state crystals, plasmonic structures, metamaterials, and photonic crystals. In metamaterials, lattice diffraction appears across microwave to optical frequencies due to collective Rayleigh scattering of periodically arranged structures. Light waves diffracted by these periodic structures can be trapped along the metamaterial surface resulting in the excitation of surface lattice resonances, which are mediated by the structural eigenmodes of the metamaterial cavity. This has brought about fascinating opportunities such as lattice-induced transparency, strong nearfield confinement, and resonant field enhancement and line-narrowing of metamaterial structural resonances through lowering of radiative losses. In this review, we describe the mechanisms and implications of metamaterial-engineered surface lattice resonances and lattice-enhanced field confinement in terahertz metamaterials. These universal properties of surface lattice resonances in metamaterials have significant implications for the design of resonant metamaterials, including ultrasensitive sensors, lasers, and slow-light devices across the electromagnetic spectrum.

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16

HUANG, GUOXIANG, SEN-YUE LOU, and MANUEL G. VELARDE. "GAP SOLITONS, RESONANT KINKS, AND INTRINSIC LOCALIZED MODES IN PARAMETRICALLY EXCITED DIATOMIC LATTICES." International Journal of Bifurcation and Chaos 06, no. 10 (October 1996): 1775–87. http://dx.doi.org/10.1142/s0218127496001119.

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The dynamics of localized nonlinear excitations of resonant frequencies ωj (j = 0, 1, 2, 3) and carrier wave frequency frequency ωe≈ωj in a damping and parametrically driven lattice system is considered. The excitations are created in a one-dimensional nonlinearly coupled diatomic pendulum lattice which is subjected to a vertical oscillation of frequency 2ωe. The recent experimental observation of gap solitons, resonant kinks, and intrinsic localized modes in the diatomic pendulum lattice system are explained by using an extended nonlinear Schrödinger theory after neglecting the nonuniformity of the pendulums and the small periodic modulations of the amplitudes of the excitations.

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17

Wang, S. T., and V. Khachatryan. "Study of transverse resonance island buckets at CESR." Journal of Physics: Conference Series 2420, no. 1 (January 1, 2023): 012047. http://dx.doi.org/10.1088/1742-6596/2420/1/012047.

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Abstract A 6-GeV lattice with the horizontal tune near a 3rd-order resonance line at 3νx =2 is designed for studying the transverse resonance island buckets (TRIBs) at the Cornell Electron Storage Ring (CESR). The distribution of 76 sextupoles powered individually is optimized to maximize the dynamic aperture and achieve the desired amplitude-dependent tune shift αxx and the resonant driving term h 30000, which are necessary conditions to form stable island buckets. The particle tracking simulations are developed to check and confirm the formation of TRIBs at different tunes with clearing kicks in this TRIBs lattice. Finally, the lattice is loaded in CESR and the TRIBs are successfully observed when the horizontal fractional tune is adjusted to 0.665, close to the 3rd-order resonance line. Bunch-by-bunch feedback is also explored to clear the particles in the main bucket and the island buckets, respectively.

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18

Paul, Srijit, Constantia Alexandrou, Luka Leskovec, Stefan Meinel, John W. Negele, Marcus Petschlies, Andrew Pochinsky, Jesus Gumaro Rendon Suzuki та Sergey Syritsyn. "ππ P-wave resonant scattering from lattice QCD". EPJ Web of Conferences 175 (2018): 05022. http://dx.doi.org/10.1051/epjconf/201817505022.

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We present a high-statistics analysis of the ρ resonance in ππ scattering, using 2 + 1 flavors of clover fermions at a pion mass of approximately 320 MeV and a lattice size of approximately 3:6 fm. The computation of the two-point functions are carried out using combinations of forward, sequential, and stochastic propagators. For the extraction of the ρ-resonance parameters, we compare different fit methods and demonstrate their consistency. For the ππ scattering phase shift, we consider different Breit-Wigner parametrizations and also investigate possible nonresonant contributions. We find that the minimal Breit-Wigner model is suffcient to describe our data, and obtain amρ = 0:4609(16)stat(14)sys and gρππ = 5:69(13)stat(16)sys. In our comparison with other lattice QCD results, we consider the dimensionless ratios amρ/amN and amπ/amN to avoid scale setting ambiguities.

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19

Liu, Yanli, Xifeng Yang, Dunjun Chen, Hai Lu, Rong Zhang, and Youdou Zheng. "Determination of Temperature-Dependent Stress State in Thin AlGaN Layer of AlGaN/GaN HEMT Heterostructures by Near-Resonant Raman Scattering." Advances in Condensed Matter Physics 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/918428.

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The temperature-dependent stress state in the AlGaN barrier layer of AlGaN/GaN heterostructure grown on sapphire substrate was investigated by ultraviolet (UV) near-resonant Raman scattering. Strong scattering peak resulting from the A1(LO) phonon mode of AlGaN is observed under near-resonance condition, which allows for the accurate measurement of Raman shifts with temperature. The temperature-dependent stress in the AlGaN layer determined by the resonance Raman spectra is consistent with the theoretical calculation result, taking lattice mismatch and thermal mismatch into account together. This good agreement indicates that the UV near-resonant Raman scattering can be a direct and effective method to characterize the stress state in thin AlGaN barrier layer of AlGaN/GaN HEMT heterostructures.

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20

Micnas, R. "On the Boson–Fermion resonant model on a lattice." Philosophical Magazine 95, no. 5-6 (November 21, 2014): 622–32. http://dx.doi.org/10.1080/14786435.2014.983574.

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21

Fradkin, I. M., S. A. Dyakov, and N. A. Gippius. "Light scattering by resonant nanoparticles in a 2D lattice." Journal of Physics: Conference Series 1092 (September 2018): 012036. http://dx.doi.org/10.1088/1742-6596/1092/1/012036.

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22

Igarashi, Jun-ichi, and Tatsuya Nagao. "Lattice Distortion and Resonant X-Ray Scattering in DyB2C2." Journal of the Physical Society of Japan 72, no. 5 (May 15, 2003): 1279–86. http://dx.doi.org/10.1143/jpsj.72.1279.

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23

Bak, M. "Resonant Two-Electron Pairs in a Simple Cubic Lattice." Acta Physica Polonica A 126, no. 4A (October 2014): A—63—A—69. http://dx.doi.org/10.12693/aphyspola.126.a-63.

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24

Alp, E. E., W. Sturhahn, and T. S. Toellner. "Lattice dynamics and inelastic nuclear resonant x-ray scattering." Journal of Physics: Condensed Matter 13, no. 34 (August 9, 2001): 7645–58. http://dx.doi.org/10.1088/0953-8984/13/34/311.

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25

Upadhyaya, J. C., and O. P. Kulshrestha. "Lattice Dynamics of Ca in the Resonant Model Potential." physica status solidi (b) 142, no. 2 (August 1, 1987): K109—K112. http://dx.doi.org/10.1002/pssb.2221420237.

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26

Weiss, M. F., and K. D. Schotte. "An integrable lattice version of the resonant level model." Nuclear Physics B 257 (January 1985): 599–609. http://dx.doi.org/10.1016/0550-3213(85)90366-9.

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27

Babicheva, Viktoriia E. "Lattice Kerker effect in the array of hexagonal boron nitride antennas." MRS Advances 3, no. 45-46 (2018): 2783–88. http://dx.doi.org/10.1557/adv.2018.510.

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ABSTRACTSubwavelength particles with hyperbolic light dispersion in the constituent medium are a promising alternative to plasmonic, high-refractive-index dielectric, and semiconductor structures in the practical realization of nanoscale optical elements. Hexagonal boron nitride (hBN) is a layered van der Waals material with natural hyperbolic properties and low-loss phonon-polaritons at the same time. In this work, we consider multipole excitations and antennas properties of hBN particles with an emphasis on the periodic arrangement and collective array modes. We analyze excitation of lattice resonances in the antenna array and effect of resonance shifts and overlap with other multipoles supported by particles in the lattice. In such periodic structure, a decrease of reflectance from the array is achieved with appropriate lattice spacing (periods) where the electric and magnetic multipoles overlap, and the resonance oscillations are in phase and comparable in magnitude. We theoretical demonstrate that in this case, generalized Kerker condition is satisfied, and hBN antennas in the array efficiently scatter light in the predominantly forward direction resulting in near-zero reflectance. The resonant lattice Kerker effect with hyperbolic-medium antennas can be applied in developing metasurfaces based on hBN resonators for mid-infrared photonics.

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28

Tuszynski,, Jack, Roman Poznanski, and Lleuvelyn Cacha. "Journal of Multiscale Neuroscience." Journal of Multiscale Neuroscience 1, no. 1 (May 28, 2022): 41–53. http://dx.doi.org/10.56280/1531676736.

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We define quantum analogs as vibrational excitations of quasi-particles coupled to electromagnetically-mediated resonance energy transfer in water (a crystal lattice). This paper addresses how neural magnetic resonance spectra of the brain’s magnetic field influence dipolar oscillation waves in crystal lattices of interfacial water molecules to produce correlates of phenomenal consciousness. We explore dipolar oscillation waves in hydrophobic protein cavities of aromatic amino acids as a conduit for coherent propagation of vibrational excitation and hydrogen bond distortion associated with phase coherence present in the magnetic field intensity oscillations at a frequency at which the energy switches from its trapped form as excited phonon states to free, cavity-mode magnetic field energy states. A quasi-polaritons that reflect “hydro-ionic waves” is a macroscopic quantum effect of crystal lattice vibrations, consisting of vibron polaritons coupled to ions across the neocortex, except the cerebellum, due to the absence of protein-protein interactions. They are quantum-like at the core and hence can exhibit quantum-like signaling properties when resonant energy is transferred as dipolar waves in hydrophobic protein cavities of aromatic amino acids. This is due to aromatic residue flexibility in molecular electromagnetic resonances. Finally, the archetypal molecular patterning of conscious experiences, which carries an inherent ambiguity necessary for non-contextually applying ‘meaning’ that encompasses cognitive signatures of conscious experience, satisfies the nature of quantum analogs and their transmutative properties.

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29

Kurumaji, Takashi, Taro Nakajima, Max Hirschberger, Akiko Kikkawa, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Yasujiro Taguchi, Taka-hisa Arima, and Yoshinori Tokura. "Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet." Science 365, no. 6456 (August 8, 2019): 914–18. http://dx.doi.org/10.1126/science.aau0968.

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Geometrically frustrated magnets can host complex spin textures, leading to unconventional electromagnetic responses. Magnetic frustration may also promote topologically nontrivial spin states such as magnetic skyrmions. Experimentally, however, skyrmions have largely been observed in noncentrosymmetric lattice structures or interfacial symmetry-breaking heterostructures. Here, we report the emergence of a Bloch-type skyrmion state in the frustrated centrosymmetric triangular-lattice magnet Gd2PdSi3. We observed a giant topological Hall response, indicating a field-induced skyrmion phase, which is further corroborated by the observation of in-plane spin modulation probed by resonant x-ray scattering. Our results may lead to further discoveries of emergent electrodynamics in magnetically frustrated centrosymmetric materials.

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30

Biswas, Deeptak, Peter Petrezcky, and Sayantan Sharma. "Aspects of chiral transition in a Hadron Resonance Gas model." EPJ Web of Conferences 274 (2022): 05010. http://dx.doi.org/10.1051/epjconf/202227405010.

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We study the chiral condensate for 2 + 1 flavor QCD with physical quarks within a non-interacting Hadron Resonance Gas (HRG) model. By including the latest information on the mass variation of the hadrons concerning the light quark mass, from lattice QCD and chiral perturbation theory, we show that it is possible to quite accurately account for the chiral crossover transition even within a conventional HRG model. We have calculated a pseudocritical temperature Tc=161.2±1.6 MeV and the curvature of crossover curve κ2=0.0203(7). These are in very good agreement with the latest continuum extrapolated results obtained from lattice QCD studies. We also discuss the limitations of extending such calculations toward the chiral limit. Furthermore, we study the effects of non-resonant hadron interactions within the HRG model and its consequences for the chiral transition in the regime of dense baryonic matter where lattice QCD results are not currently available.

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31

Kawai, Daisuke. "ρ resonance from the I = 1 ππ potential in lattice QCD". EPJ Web of Conferences 175 (2018): 05007. http://dx.doi.org/10.1051/epjconf/201817505007.

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We calculate the phase shift for the I = 1 ππ scattering in 2+1 flavor lattice QCD at mπ = 410 MeV, using all-to-all propagators with the LapH smearing. We first investigate the sink operator independence of the I = 2 ππ scattering phase shift to estimate the systematics in the LapH smearing scheme in the HAL QCD method at mπ = 870 MeV. The difference in the scattering phase shift in this channel between the conventional point sink scheme and the smeared sink scheme is reasonably small as long as the next-toleading analysis is employed in the smeared sink scheme with larger smearing levels. We then extract the I = 1 ππ potential with the smeared sink operator, whose scattering phase shift shows a resonant behavior (ρ resonance). We also examine the pole of the S-matrix corresponding to the ρ resonance in the complex energy plane.

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32

Roy, S. K., and N. Kundu. "Anharmonic effects on lattice resonant modes of impure metallic crystals." Pramana 34, no. 3 (March 1990): 217–24. http://dx.doi.org/10.1007/bf02845765.

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33

Chen, W., W. Chen, and Y. J. Chen. "A Characteristic Matrix Approach for Analyzing Resonant Ring Lattice Devices." IEEE Photonics Technology Letters 16, no. 2 (February 2004): 458–60. http://dx.doi.org/10.1109/lpt.2003.823104.

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34

RÖHLSBERGER, RALF. "MAGNETISM AND LATTICE DYNAMICS OF NANOSCALE STRUCTURES STUDIED BY NUCLEAR RESONANT SCATTERING OF SYNCHROTRON RADIATION." International Journal of Nanoscience 04, no. 05n06 (October 2005): 975–86. http://dx.doi.org/10.1142/s0219581x05003942.

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Nuclear resonant scattering of synchrotron radiation is applied to investigate the magnetic structure and the lattice dynamics of nanoscale systems. The outstanding brilliance of modern synchrotron radiation sources allows for sensitivities to smallest amounts of material. Due to the isotopic sensitivity of the scattering process, ultrathin probe layers of Mössbauer isotopes can be used to map out the magnetic and vibrational structure of thin films with sub-nm spatial resolution. Elastic nuclear resonant scattering is applied to determine the magnetic spin structure of an exchange-coupled bilayer system. Inelastic nuclear resonant scattering was used to determine the vibrational density of states in Fe islands on the W(110) surface.

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35

Gunawan, Vincensius, Ngurah Ayu Ketut Umiati, and Agus Subagio. "The Electric Susceptibility of Bi-Layers Ferroelectrics." Journal of Physics and Its Applications 1, no. 2 (June 20, 2019): 53. http://dx.doi.org/10.14710/jpa.v1i2.4860.

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In order to enhance insight of layered structure, we perform numerical calculation to obtain the dynamic electric susceptibility in bi-layers ferroelectrics. Since susceptibility is a parameter which gives response to the external field, then determination of this parameter is important. A lattice model is employed to slice bilayer structure into several lattices. Then, Landau-Khalatnikov equation of motion is used in each lattice to construct a matrix equation of equation of motion. The solution is obtained by applying entire-cell effective medium. We find that the homogeneity of dynamic polarization is different from homogeneity of the single individual layer due to the existence of interlayer interaction. As a result, the electric susceptibility is also altered. It is also noticed that there is a relation between the homogeneity of dynamic polarization and the value of electric susceptibility near resonant frequency. The higher the homogeneity, the bigger the values of susceptibility will be.

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36

Shimoyama, Hidefumi, Tokiko Osawa, Hiromi Watanabe, Kosuke Suzuki, Hiroshi Sakurai, and Masahisa Ito. "First Observation of Non-Resonant X-Ray Magnetic Diffraction for Multilayers." Key Engineering Materials 698 (July 2016): 3–7. http://dx.doi.org/10.4028/www.scientific.net/kem.698.3.

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Co/Pd magnetic multilayers have been prepared by using a sputtering method. Lattice distances and magnetic hysteresis curves have been measured by X-ray diffraction (XRD) measurements and magnetization measurements using a vibrating sample magnetometer (VSM). The XRD measurements have shown that the samples with thinner Pd layers have shorter lattice distances, and the VSM measurements have shown that the samples of thinner Co and thicker Pd layers are closer to those of perpendicular magnetic anisotropy. We have applied the X-ray magnetic diffraction method to the Co/Pd multilayer for the first time and have succeeded in observing a change in the X-ray diffraction intensities by the reversal of the magnetization direction.

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37

Quan, Li Na, Yoonjae Park, Peijun Guo, Mengyu Gao, Jianbo Jin, Jianmei Huang, Jason K. Copper, et al. "Vibrational relaxation dynamics in layered perovskite quantum wells." Proceedings of the National Academy of Sciences 118, no. 25 (June 15, 2021): e2104425118. http://dx.doi.org/10.1073/pnas.2104425118.

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Organic–inorganic layered perovskites, or Ruddlesden–Popper perovskites, are two-dimensional quantum wells with layers of lead-halide octahedra stacked between organic ligand barriers. The combination of their dielectric confinement and ionic sublattice results in excitonic excitations with substantial binding energies that are strongly coupled to the surrounding soft, polar lattice. However, the ligand environment in layered perovskites can significantly alter their optical properties due to the complex dynamic disorder of the soft perovskite lattice. Here, we infer dynamic disorder through phonon dephasing lifetimes initiated by resonant impulsive stimulated Raman photoexcitation followed by transient absorption probing for a variety of ligand substitutions. We demonstrate that vibrational relaxation in layered perovskite formed from flexible alkyl-amines as organic barriers is fast and relatively independent of the lattice temperature. Relaxation in layered perovskites spaced by aromatic amines is slower, although still fast relative to bulk inorganic lead bromide lattices, with a rate that is temperature dependent. Using molecular dynamics simulations, we explain the fast rates of relaxation by quantifying the large anharmonic coupling of the optical modes with the ligand layers and rationalize the temperature independence due to their amorphous packing. This work provides a molecular and time-domain depiction of the relaxation of nascent optical excitations and opens opportunities to understand how they couple to the complex layered perovskite lattice, elucidating design principles for optoelectronic devices.

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38

Madine, K. H., and D. J. Colquitt. "Dynamic Green’s functions in discrete flexural systems." Quarterly Journal of Mechanics and Applied Mathematics 74, no. 3 (August 1, 2021): 323–50. http://dx.doi.org/10.1093/qjmam/hbab006.

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Summary The article presents an analysis of the dynamic behaviour of discrete flexural systems composed of Euler–Bernoulli beams. The canonical object of study is the discrete Green’s function, from which information regarding the dynamic response of the lattice under point loading by forces and moments can be obtained. Special attention is devoted to the interaction between flexural and torsional waves in a square lattice of Euler–Bernoulli beams, which is shown to yield a range of novel effects, including extreme dynamic anisotropy, asymmetric wave propagation, wave-guiding, filtering and the ability to create localised defect modes, all without the need for additional resonant elements or interfaces. The analytical study is complimented by numerical computations and finite element simulations, both of which are used to illustrate the effects predicted. A general algorithm is provided for constructing Green’s functions as well as defect modes. This algorithm allows the tuning of the lattice to produce pass bands, band gaps, resonant modes, wave-guides and defect modes, over any desired frequency range.

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39

Pisati, Marco, Marco Giuseppe Corneo, Stefano Beretta, Emanuele Riva, Francesco Braghin, and Stefano Foletti. "Numerical and Experimental Investigation of Cumulative Fatigue Damage under Random Dynamic Cyclic Loads of Lattice Structures Manufactured by Laser Powder Bed Fusion." Metals 11, no. 9 (September 3, 2021): 1395. http://dx.doi.org/10.3390/met11091395.

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Lattice structures are lightweight engineering components suitable for a great variety of applications, including those in which the structural integrity under vibration fatigue is of paramount importance. In this work, we experimentally and numerically investigate the dynamic response of two distinct lattice configurations, in terms of fatigue damage and life. Specifically, Face-Centered-Cubic (FCC) and Diamond lattice-based structures are numerically studied and experimentally tested under resonant conditions and random vibrations, until their failure. To this end, Finite Element (FE) models are employed to match the dynamic behavior of the system in the neighborhood of the first natural frequency. The FE models are employed to estimate the structural integrity by way of frequency and tip acceleration drops, which allow for the identification of the failure time and a corresponding number of cycles to failure. Fatigue life under resonant conditions is well predicted by the application of conventional multiaxial high cycle fatigue criteria to the local state of stress. The same approach, combined with the Rainflow algorithm and Miner’s rule, provides good results in predicting fatigue damage under random vibrations.

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40

Kozar, A. I. "Scattering of electromagnetic waves by a discrete octahedron from resonant spheres." Radiotekhnika, no. 203 (December 23, 2020): 181–85. http://dx.doi.org/10.30837/rt.2020.4.203.19.

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A solution is given to the problem of scattering of electromagnetic waves by a discrete convex polyhedron – an octahedron of resonant magnetodielectric spheres based on a complex rhombic crystal lattice. Here we consider a case equivalent to the X-ray optics of crystals, when α / λ՛<<1 and can be α / λg ~ 1; d, h, l / λ՛ ~ 1, where α is the radius of the spheres; λ՛, λg are the lengths of the scattered wave outside and inside the spheres; d, h, l are constant lattices. The solution of the problem is obtained based on the Fredholm integral equations of electrodynamics of the second kind with nonlocal boundary conditions. The expressions found in this work for a metacrystal in the form of an octahedron can be used to study the fields scattered by the crystal in the Fresnel and Fraunhofer zones, as well as to study its internal field. The relations obtained in this work can find application in the study of the scattering of waves of various kinds by convex polyhedrons, the creation on their basis of new types of limited metacrystals, including nanocrystals with resonance properties, and in the study of their behavior in various external media. As well as in the development of methods for modeling electromagnetic phenomena that can occur in real crystals in resonance regions in the optical and X-ray wavelength ranges.

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41

Pelinovsky, Dmitry, Tiziano Penati, and Simone Paleari. "Approximation of small-amplitude weakly coupled oscillators by discrete nonlinear Schrödinger equations." Reviews in Mathematical Physics 28, no. 07 (August 2016): 1650015. http://dx.doi.org/10.1142/s0129055x1650015x.

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Small-amplitude weakly coupled oscillators of the Klein–Gordon lattices are approximated by equations of the discrete nonlinear Schrödinger type. We show how to justify this approximation by two methods, which have been very popular in the recent literature. The first method relies on a priori energy estimates and multi-scale decompositions. The second method is based on a resonant normal form theorem. We show that although the two methods are different in the implementation, they produce equivalent results as the end product. We also discuss the applications of the discrete nonlinear Schrödinger equation in the context of existence and stability of breathers of the Klein–Gordon lattice.

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42

Romashkina, A. M., V. B. Novikov, and T. V. Murzina. "Collective lattice and plasmonic resonances in the enhancement of circular dichroism in disk–rod metasurface." Journal of Applied Physics 133, no. 4 (January 28, 2023): 043103. http://dx.doi.org/10.1063/5.0124798.

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Compact planar photonic elements serving for efficient control over the polarization of light are of paramount importance in photonics. Here, we propose a design of a chiral periodic metasurface based on plasmonic nanodisks and nanorods arranged asymmetrically in a unit cell. Using the finite-difference time-domain analysis, we show that the collective lattice resonance harnessed by the diffraction coupling of the plasmonic unit cells is the heart of the revealed resonant 38% circular dichroism effect. The circular dichroism enhancement of the considered structure is improved using the deep-learning-assisted optimization of the metasurface design.

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43

Bukhari, Mohammad A., Oumar R. Barry, and Alexander F. Vakakis. "Breather propagation and arrest in a strongly nonlinear locally resonant lattice." Mechanical Systems and Signal Processing 183 (January 2023): 109623. http://dx.doi.org/10.1016/j.ymssp.2022.109623.

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44

Yoo, Hyungmo. "Phonon assisted tunneling in lattice-matched and pseudomorphic resonant tunneling diodes." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 8, no. 2 (March 1990): 370. http://dx.doi.org/10.1116/1.585074.

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45

Zhao, Hai-Qiong, and Guo-Fu Yu. "Pfaffian Solutions and Resonant Interaction Properties of a Coupled BKP Lattice." Communications in Theoretical Physics 62, no. 2 (August 2014): 235–44. http://dx.doi.org/10.1088/0253-6102/62/2/11.

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46

Sun, Jijiang, and Shiwang Ma. "Nontrivial periodic motions for resonant type asymptotically linear lattice dynamical systems." Journal of Mathematical Analysis and Applications 417, no. 2 (September 2014): 622–34. http://dx.doi.org/10.1016/j.jmaa.2014.03.046.

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47

Brown, E. R., S. J. Eglash, G. W. Turner, C. D. Parker, J. V. Pantano, and D. R. Calawa. "Effect of lattice-mismatched growth on InAs/AlSb resonant-tunneling diodes." IEEE Transactions on Electron Devices 41, no. 6 (June 1994): 879–82. http://dx.doi.org/10.1109/16.293296.

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48

Ramirez, M. O., A. Kumar, S. A. Denev, Y. H. Chu, J. Seidel, L. W. Martin, S. Y. Yang, et al. "Spin-charge-lattice coupling through resonant multimagnon excitations in multiferroic BiFeO3." Applied Physics Letters 94, no. 16 (April 20, 2009): 161905. http://dx.doi.org/10.1063/1.3118576.

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49

Javier Brey, J., and J. Casado-Pascual. "First passage time problems and resonant behavior on a fluctuating lattice." Physica A: Statistical Mechanics and its Applications 212, no. 1-2 (December 1994): 123–31. http://dx.doi.org/10.1016/0378-4371(94)90142-2.

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50

Hermann, Raphael. "Combined neutron scattering and resonant ultrasound spectroscopy for lattice dynamics studies." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A131. http://dx.doi.org/10.1121/10.0015785.

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Resonant ultrasound spectroscopy (RUS) and inelastic neutron scattering afford insight into solid state structures and excitations at vastly different frequency and length scales. We will discuss the combined use of these techniques to understand phase transitions in functional and structural materials. Structural complexity, such as chirality or incommensuration leads to emerging features in both techniques and modifies energy transport channels. Novel developments in techniques at the Oak Ridge neutron sources, that now enable in situ ultrasound spectrocopy in the neutron beam, and the RUSCal analysis software that now supports all Bravais classes and implements Monte-Carlo methods, will be discussed in example materials. [Work supported by the Deparment of Energy Office of Basic Energy Science and by Laboratory Directed Research at Oak Ridge National Laboratory. My thanks go to J. Torres, V. Fanelli, Y. Shinohara, E. Cakmak, C. Hua, A. Flores-Bettancourt, M. Ruis-Rodriguez for the collaboration and A. Zevalkink, D. Mandrus, V. Keppens, E. Lara-Curzio, and T. Watkins for fruitful discussions.]

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