569 research outputs found
Cooperative order and excitation spectra in the bicomponent spin networks
A ferrimagnetic spin model composed of spin-dimers and
spin-chains is studied by combining the bond-operator representation (for
spin-dimers) and Holstein-Primakoff transformation (for spins).
A finite interaction between the spin-dimer and the spin chain
makes the spin chains ordered antiferromagnetically and the spin dimers
polarized. The effective interaction between the spin chains, mediated by the
spin dimers, is calculated up to the third order. The staggered magnetization
in the spin dimer is shown proportional to . It presents an
effective staggered field reacting on the spin chains. The degeneracy of the
triplons is lifted due to the chain magnetization and a mode with longitudinal
polarization is identified. Due to the triplon-magnon interaction, the
hybridized triplon-like excitations show different behaviors near the vanishing
. On the other hand, the hybridized magnon-like excitations open a
gap . These results consist well with the experiments
on CuFeGeO.Comment: 7 pages, 5 figure
A Novel Microwave Tunable Band-Pass Filter Integrated Power Divider Based on Liquid Crystal
This paper proposes a novel microwave continuous adjustable band-pass filter integrated power divider based on nematic liquid crystals (LCs). The proposed power divider uses liquid crystal (LC) as the dielectric material. It can realize phase shift by changing the dielectric anisotropy, when biasing the high anisotropy nematic liquid crystal. It is mainly used in microwave frequencies. It has a large number of advantages compared to conventional filter integrated power divider, such as low loss, multifunction integration, continuous adjustable, miniaturization, low processing costs, low operating voltage, high phase shift, and convenient manufacture. Therefore, it has shown great potential for application
- …