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Finite-difference (FD) modeling of seismic waves in the vicinity of dipping interfaces gives rise to artifacts. Examples are phase and amplitude errors, as well as staircase diffractions. Such errors can be reduced in two general ways. In…

地球物理 · 物理学 2022-01-11 Erik F. M. Koene , Jens Wittsten , Johan O. A. Robertsson

This research thesis presents a novel higher-order spectral element method (SEM) formulated in cylindrical coordinates for analyzing electromagnetic fields in waveguides filled with complex anisotropic media. In this study, we consider a…

数值分析 · 数学 2024-11-22 Raul Oliveira Ribeiro

Few-shot semantic segmentation (FSS) aims to segment objects of unseen classes in query images with only a few annotated support images. Existing FSS algorithms typically focus on mining category representations from the single-view support…

计算机视觉与模式识别 · 计算机科学 2023-09-29 Qinglong Cao , Yuntian Chen , Chao Ma , Xiaokang Yang

Photochemical reactions on semiconductors are anisotropic, since they occur with different rates on surfaces of different orientation. Understanding the origin of this anisotropy is crucial to engineering more efficient photocatalysts. In…

材料科学 · 物理学 2022-05-04 Chiara Ricca , Ulrich Aschauer

We use the coupled cluster method (CCM) to study the ground-state properties and lowest-lying triplet excited state of the spin-half {\it XXZ} antiferromagnet on the square lattice. The CCM is applied to it to high orders of approximation…

We present a numerical approach to simulate the Ferromagnetic Resonance (FMR) of micron and nanosized magnetic elements by a micromagnetic finite difference method. In addition to a static magnetic field a linearly polarized oscillating…

计算物理 · 物理学 2016-10-31 K. Wagner , S. Stienen , M. Farle

We numerically investigate the effect of in-plane anisotropic Fermi surface (FS) on the flux-flow resistivity $\rho_{\rm f}$ under rotating magnetic field on the basis of the quasiclassical Green's function method. We demonstrate that one…

超导电性 · 物理学 2016-02-02 Yoichi Higashi , Yuki Nagai , Masahiko Machida , Nobuhiko Hayashi

We introduce the concept of Metasurface Absorbing-Boundary Condition (MS-ABC). This represents the first application of metasurface technology to computational electromagnetics. MS-ABCs have similar performance as previously reported…

计算物理 · 物理学 2018-09-21 Xiao Jia , Guillaume Lavigne , Christophe Caloz , Fan Yang

The classical, square lattice, uniaxially anisotropic Heisenberg antiferromagnet in a magnetic field parallel to the easy axis is studied using Monte Carlo techniques. The model displays a long-range ordered antiferromagnetic, an…

统计力学 · 物理学 2007-05-23 M. Holtschneider , W. Selke , R. Leidl

Influence of two type of spin structures on the form of the Fermi surface (FS) and a photoemission intensity map is studied for t-t'-U Hubbard model. Mean field calculations are done for the stripe phase and for the spiral spin structure.…

强关联电子 · 物理学 2015-06-24 A A Ovchinnikov , M Ya Ovchinnikova

The ferromagnetic resonance frequencies are obtained for a thin ferromagnetic film with surface anisotropy for the cases when the external magnetic field is applied perpendicularly or parallel to the film surface, and for various…

介观与纳米尺度物理 · 物理学 2018-12-05 N. A. Usov

With their self-tuned time-varying responses, waveform-selective metasurfaces embedded with nonlinear electronics have shown fascinating applications, including distinguishing different electromagnetic waves depending on the pulse width.…

应用物理 · 物理学 2022-11-30 Ashif Aminulloh Fathnan , Haruki Homma , Shinya Sugiura , Hiroki Wakatsuchi

Reconfigurable intelligent surface (RIS) has been explored as a supportive technology for wireless communication since around 2019. While the literature highlights the potential of RIS in different modern applications, two key issues have…

Magnetic skyrmions are topological solitons with a nanoscale winding spin texture that hold promise for spintronics applications. Until now, skyrmions have been observed in a variety of magnets that exhibit nearly parallel alignment for the…

In noncentrosymmetric superconductors (NCSs), the inversion symmetry (IS) is most commonly broken by an antisymmetric spin-orbit coupling (SOC) removing the spin degeneracy and splitting the Fermi surface (FS) into two branches. A two…

超导电性 · 物理学 2017-04-05 Mehmet Günay , T. Hakioğlu , Hasan Hüseyin Sömek

Electromagnetic interaction between a sub-wavelength particle (the `probe') and a material surface (the `sample') is studied theoretically. The interaction is shown to be governed by a series of resonances corresponding to surface polariton…

介观与纳米尺度物理 · 物理学 2016-02-11 B. -Y. Jiang , L. M. Zhang , A. H. Castro Neto , D. N. Basov , M. M. Fogler

We propose a novel analytical model for anisotropic multi-layer cylindrical structures containing graphene layers. The general structure is formed by an aperiodic repetition of a three-layer sub-structure, where a graphene layer, with an…

光学 · 物理学 2021-03-17 Mohammad Bagher Heydari , Mohammad Hashem Vadjed Samiei

Recent research discovered that charge transfer processes in chiral molecules can be spin selective and named the effect chiral-induced spin selectivity (CISS). Follow-up work studied hybrid spintronic devices with conventional electronic…

介观与纳米尺度物理 · 物理学 2019-06-25 Xu Yang , Tom Bosma , Bart J. van Wees , Caspar H. van der Wal

The effect of surface anisotropy on the distribution of energy barriers in magnetic fine particles of nanometer size is discussed within the framework of the $T\ln(t/\tau_0)$ scaling approach. The comparison between the distributions of the…

Antiferromagnetic hexagonal MnTe is a promising material for spintronic devices relying on the control of antiferromagnetic domain orientations. Here we report on neutron diffraction, magnetotransport, and magnetometry experiments on…