Results 71 to 80 of about 199,377 (193)

Dirac operator index and topology of lattice gauge fields [PDF]

, 1999
The fermionic topological charge of lattice gauge fields, given in terms of a spectral flow of the Hermitian Wilson--Dirac operator, or equivalently, as the index of Neuberger's lattice Dirac operator, is shown to have analogous properties to L\"uscher's
Adams, David H.
core   +1 more source

Investigating the topological structure of quenched lattice QCD with overlap fermions by using multi-probing approximation

, 2017
The topological charge density and topological susceptibility are determined by multi-probing approximation using overlap fermions in quenched SU(3) gauge theory.
Chen, Ying, Liu, Chuan, Liu, Yu-Bin, Ma, Jian-Ping, Xiong, Guang-Yi, Zhang, Jian-Bo, Zou, You-Hao   +6 more
core   +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

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

Comparing topological charge definitions using topology fixing actions [PDF]

The European Physical Journal A, 2010
We investigate both the hyperbolic action and the determinant ratio action designed to fix the topological charge on the lattice. We show to what extent topology is fixed depending on the parameters of these actions, keeping the physical situation fixed.
Bruckmann, F., Gruber, F., Jansen, K., Marinkovic, M., Urbach, C., Wagner, M.   +5 more
openaire   +4 more sources

Unconventional Topological Weyl Dipole Phonon

Advanced Science
A pair of Weyl points (WPs) with opposite topological charges can exhibit an additional higher‐order Z2 topological charge, giving rise to the formation of a Z2 Weyl dipole (WD).
Jianhua Wang, Yang Wang, Feng Zhou, Wenhong Wang, Zhenxiang Cheng, Shifeng Qian, Xiaotian Wang, Zhi‐Ming Yu   +7 more
doaj   +1 more source

Topological Charge of Multi-Color Optical Vortices

Photonics, 2022
The topological charge of an optical vortex is a quantity rather stable against phase distortions, for example, turbulence. This makes the topological charge attractive for optical communications, but for many structured beams it is unknown.
Victor Victorovich Kotlyar, Alexey Andreevich Kovalev, Anton Gennadyevich Nalimov, Sergey Sergeevich Stafeev   +3 more
doaj   +1 more source

Charged topological black hole pair creation [PDF]

Nuclear Physics B, 1998
32 pages ...
openaire   +2 more sources

Optics-to-THz conversion of vortex beams using nonlinear difference frequency generation [PDF]

Компьютерная оптика, 2019
In this paper, using a modified model of slowly varying amplitudes, a process of optics-to-THZ-conversion of vortex beams based on the nonlinear difference frequency generation in a medium with second-order susceptibility is considered.
Valeriy Bagmanov, Albert Sultanov, Azat Gizatulin, Ivan Meshkov, Ilya Kuk, Elizaveta Grakhova, Guzel Abdrakhmanova, Irina Vinogradova   +7 more
doaj   +1 more source

Unveiling higher-order topology via polarized topological charges

Physical Review B
Higher-order topological phases (HOTPs) host exotic topological states that go beyond the traditional bulk-boundary correspondence. Up to now, there is still a lack of experimentally measurable momentum-space topological characterization for the HOTPs, which is not conducive to revealing the essential properties of these topological states and also ...
Wei Jia, Bao-Zong Wang, Ming-Jian Gao, Jun-Hong An   +3 more
openaire   +2 more sources