Results 71 to 80 of about 200,617 (293)

Magnetic Force Microscopy Signatures of Higher‐Order Skyrmions and Antiskyrmions

Advanced Functional Materials, EarlyView.
Magnetic force microscopy operated under vacuum conditions enables the qualitative identification of higher‐order skyrmions and antiskyrmions in Co/Ni multilayers at room temperature. Distinct stray‐field contrast signatures arise from vertical Bloch lines and complex domain‐wall configurations.
Sabri Koraltan, Joe Sunny, Tamer Karaman, Reshma Peremadathil‐Pradeep, Emily Darwin, Felix Büttner, Dieter Suess, Hans Josef Hug, Manfred Albrecht   +8 more
wiley   +1 more source

Common topological charge of several similar off-axis vortex light beams of arbitrary rotationally symmetric shape

Компьютерная оптика
We investigate the topological charge of superposition of parallel identical vortex beams of arbitrary shape – either Laguerre-Gaussian beams or Bessel-Gaussian beams or some other vortex beams with a rotationally symmetric intensity distribution.
A.A. Kovalev, V.V. Kotlyar, A.G. Nalimov
doaj   +1 more source

Ergodic sampling of the topological charge using the density of states

European Physical Journal C: Particles and Fields, 2021
In lattice calculations, the approach to the continuum limit is hindered by the severe freezing of the topological charge, which prevents ergodic sampling in configuration space.
Guido Cossu, David Lancaster, Biagio Lucini, Roberto Pellegrini, Antonio Rago   +4 more
doaj   +1 more source

Topological Lattice Actions [PDF]

, 2010
We consider lattice field theories with topological actions, which are invariant against small deformations of the fields. Some of these actions have infinite barriers separating different topological sectors.
A D’Adda, A Patrascioiu, A Patrascioiu, A Patrascioiu, A Phillips, AB Zamolodchikov, AM Polyakov, AS Kronfeld, B Berg, BB Beard, D Petcher, DJR Pugh, E Vicari, E Vicari, E Witten, E Witten, G Münster, G Veneziano, G Veneziano, H Fukaya, H Fukaya, H Fukaya, J Balog, J Balog, J Balog, J Balog, J Balog, J Balog, K Symanzik, K Symanzik, L Debbio Del, L Giusti, L Giusti, M Aizenman, M Blatter, M Campostrini, M Göckeler, M Göckeler, M Göckeler, M Hasenbusch, M Lüscher, M Lüscher, M Lüscher, M Lüscher, M Lüscher, M Lüscher, M Lüscher, M Lüscher, M Lüscher, M Lüscher, M. Pepe, P Hasenfratz, P Hasenfratz, P Hasenfratz, P Hasenfratz, P Hasenfratz, P Hernández, P Schwab, PB Wiegmann, PH Ginsparg, R Burkhalter, R Burkhalter, S Caracciolo, T Reisz, T Reisz, U Wolff, U Wolff, U. Gerber, U.-J. Wiese, V Azcoiti, W Bietenholz, W Bietenholz, W Bietenholz, W. Bietenholz   +73 more
core   +1 more source

Stacking‐Engineered Magnonic Topology and Transport in Honeycomb Homobilayers

Advanced Functional Materials, EarlyView.
ABSTRACT Topological magnons have emerged as a promising platform for dissipationless bosonic transport. However, a straightforward and effective strategy to engineer such topological states in real materials has yet to be fully realized. Here, a general scheme for controlling magnonic topological states via stacking engineering in van der Waals ...
Xiaoran Feng, Yingxi Bai, Bo Yuan, Ying Dai, Baibiao Huang, Chengwang Niu, Xiaotian Wang   +6 more
wiley   +1 more source

Covalent Organic Frameworks for Photocatalytic CO2 Reduction: Metal Integration Principles, Strategies and Functions

Advanced Functional Materials, EarlyView.
Covalent organic frameworks (COFs) with metals have been recognized as versatile platforms for photocatalytic CO2 reduction (CO2PRR). Herein, an overview of metal integration strategies for COFs is systematically summarized. Regulatory mechanisms and structure–activity relationships between metal integration and COF‐based CO2PRR are emphasized.
Jie He, Minxian Zhang, Jinqiang Zhang, Hongqi Sun, Shaobin Wang, Xiaoguang Duan   +5 more
wiley   +1 more source

Small Instantons in $CP^1$ and $CP^2$ Sigma Models [PDF]

, 2006
The anomalous scaling behavior of the topological susceptibility $\chi_t$ in two-dimensional $CP^{N-1}$ sigma models for $N\leq 3$ is studied using the overlap Dirac operator construction of the lattice topological charge density.
H. B. Thacker, H. B. Thacker, Yaogang Lian   +2 more
core   +2 more sources

Arbitrary orbital angular momentum addition in second harmonic generation

New Journal of Physics, 2014
We demonstrate second harmonic generation performed with optical vortices with different topological charges imprinted on orthogonal polarizations. Besides the intuitive charge doubling, we implement arbitrary topological charge addition on the second ...
W T Buono, L F C Moraes, J A O Huguenin, C E R Souza, A Z Khoury   +4 more
doaj   +1 more source

Model Realization and Numerical Studies of a Three-Dimensional Bosonic Topological Insulator and Symmetry-Enriched Topological Phases [PDF]

, 2014
We study a topological phase of interacting bosons in (3+1) dimensions which is protected by charge conservation and time-reversal symmetry. We present an explicit lattice model which realizes this phase and which can be studied in sign-free Monte Carlo ...
Geraedts, Scott, Motrunich, Olexei
core   +3 more sources

Lattice topological charge and boundary conditions

Physics Letters B, 1989
Abstract We discuss some effects of the boundary conditions on the topological properties of lattice gauge theories.
DI GIACOMO, ADRIANO, PAFFUTI, GIAMPIERO, M. POLIKARPOV   +2 more
openaire   +2 more sources