Article
Nanoscience & Nanotechnology
Yazdan Soori, Hamed Rezania
Summary: In this study, exchange interaction between two magnetic impurities in doped biased bilayer graphene was investigated by directly computing Green's function within full band method. The results showed that an external magnetic field induces ferromagnetic ordering, leading to an anisotropic interaction.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Yazdan Soori, Hamed Rezania
Summary: The study focuses on the exchange interaction between two magnetic impurities in doped biased bilayer graphene by computing the Green's function. The analysis reveals that a field induced ferromagnetic ordering mediates an anisotropic interaction between two magnetic moments. The impact of external magnetic field and chemical potential on the exchange interaction is investigated.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Geochemistry & Geophysics
Zhuangzhuang Kang, Hongnian Wang, Yazhou Wang, Changchun Yin
Summary: A new approximation algorithm is developed to compute the electromagnetic tensor Green's function in biaxial anisotropic media based on Fourier series expansion, enhancing computation efficiency by using finite terms of the series. The algorithm is shown to be valid and robust through agreement with analytic solutions and demonstration on a transversely isotropic medium.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Zhibo Wei, Zhou Hu, Rui Zhu, Yan Chen, Gengkai Hu
Summary: This paper proposes a novel design for a three-dimensional pentamode metamaterial, which can exhibit both anisotropic and isotropic properties by changing its geometry. Experimental results demonstrate that this pentamode metamaterial can manipulate the amplitude and wavefront of acoustic waves, providing a wider platform for tunable control of acoustic waves in fluids.
MATERIALS & DESIGN
(2023)
Article
Engineering, Electrical & Electronic
Hui-Wen Zhang, Xiao-Wei Huang, Xin-Qing Sheng
Summary: We present a surface integral equation (SIE) solution for a special class of anisotropic media, and derive the closed-form Green's function using potential functions. Detailed proofs of vector identities are given for the first time, and special treatments are applied to address the singularity of the anisotropic Green's function for discretization. Numerical experiments validate the accuracy, stability, and high efficiency of the proposed solution.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Thermodynamics
Liu Cui, Xinwang Guo, Qingsheng Yu, Gaosheng Wei, Xiaoze Du
Summary: This paper investigates the heat transport in graphene phononic metamaterials (GPMs) using molecular dynamics simulations. The results reveal that GPMs have lower thermal conductivities and stronger anisotropy compared to graphene nanoribbons (GNRs). The reduction in thermal conductivity is attributed to phonon localization, local resonance, and phonon boundary scattering. The thermal anisotropy results from the anisotropic relaxation times of phonons and the anisotropic contributions of low-frequency phonons.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Ernian Pan
Summary: In this paper, analytical time-dependent Green's functions in a two-dimensional, anisotropic elastic, and infinite solid are derived using the Stroh formalism and the Cauchy's residue theorem. The final expressions of the Green's function are simple finite line integrals from 0 to 2 pi, applicable for various types of time-dependent line forces and general space-dependence. Numerical examples demonstrate the effects of source types and material anisotropy on the Green's functions.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Optics
Maria Blanco de Paz, Alejandro Gonzalez-Tudela, Paloma A. Huidobro
Summary: In this study, we discuss the emergence and manipulation of generalized Dirac cones in the subradiant collective modes of a subwavelength dipolar array. By introducing uniaxial anisotropy in the lattice, the dispersion relations of the Dirac cones can be modified, including the tilting of the cones, changes in the local density of states, the emergence of semi-Dirac points, and the anisotropic movement of the cones. These energy dispersions have significant effects on the dynamics of local probes.
Article
Acoustics
Colby W. Cushing, Matthew J. Kelsten, Xiaoshi Su, Preston S. Wilson, Michael R. Haberman, Andrew N. Norris
Summary: This study attempts to experimentally verify anisotropic sound speeds predicted by finite element simulations using additively manufactured anisotropic 3D pentamode samples made of titanium. The results show that the deconvolution method can extract the band limited impulse response data, and a technique to extract the longitudinal PM wave speed for frequency domain simulations is given.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Physics, Applied
Zhihong Xu, Pan Li, Meiyu Liu, Qiujiao Du, Yifan Guo, Pai Peng
Summary: An ultrathin acoustic metasurface made up of an anisotropic three-component resonator is proposed, which can induce nondegenerate dipole resonances at the same resonant frequencies and modulate the phase delay based on polarization direction.
APPLIED PHYSICS EXPRESS
(2022)
Article
Mathematics
Andreas Kalogeropoulos, Nikolaos L. Tsitsas
Summary: This paper investigates the direct scattering problem of a piecewise-homogeneous medium with anisotropic layers excited by a primary spherical sound wave. The anisotropic characteristics are incorporated into the modified scalar Helmholtz equation, and the T-matrix of the problem is analytically determined using a suitable coordinate transformation. The acoustic fields in all layers are obtained, and specific reductions to special cases are presented.
Article
Materials Science, Multidisciplinary
Baojian Zhang, Xin Fan, Jiadong Han, Longming Fu, Di Wu
Summary: Green's functions of transversely isotropic hygro-thermo-magneto-piezoelectric (HTMP) cones are established and the three-dimensional problems of HTMP cones subjected to point sources are analyzed. Numerical examples and contours of the coupled fields are given, and the variation regularity of stress, electric displacement, and magnetic induction are discussed.
MATHEMATICS AND MECHANICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Manuel J. Freire, Jesus Tornero, Ricardo Marques
Summary: This work demonstrates the use of metamaterial lenses to improve the signal-to-noise ratio of magnetic resonance imaging coils in low-field magnetic resonance imaging systems. The dominant source of noise in the signal-to-noise ratio in low-field magnetic resonance imaging systems is the metallization of the coil, while the contribution of noise sample or tissue can be neglected, unlike in high-field magnetic resonance imaging systems. A metamaterial lens composed of a three-dimensional array of capacitively loaded split rings was fabricated and tested on a 0.3 T MRI system. The experiment showed that the metamaterial lens was far enough from the coil to introduce negligible additional losses and tissue losses.
RESULTS IN PHYSICS
(2023)
Article
Multidisciplinary Sciences
R. Dora, S. Saha, D. Q. Lu, S. K. Mohanty
Summary: This paper discusses three different resonances associated with flexural gravity wave motion in the presence of current and permeable bottom: blocking, trapping, and Bragg resonance. The interconnection among these resonances is analyzed using different modes of wave propagation. Uneven plate deflection is observed in the blocking resonance zone. The uniform convergence of the infinite series associated with the trapped mode is proven. The model is numerically validated for trapped and Bragg resonances against existing literature.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Mathematics, Applied
Assyr Abdulle, Doghonay Arjmand, Edoardo Paganoni
Summary: This paper focuses on computing effective quantities using multiscale methods and analyzes the application of elliptic methods in calculating homogenized coefficients with high convergence rates in epsilon/delta.
MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES
(2021)
