论文标题
多中心磁备激发为量子磁铁的Terahertz磁力计打开了整个布里鲁因区域
Multi-Center Magnon Excitations Open the Entire Brillouin Zone to Terahertz Magnetometry of Quantum Magnets
论文作者
论文摘要
由于光子动量较小，光谱法通常仅在布里渊区的中心探测磁激发。但是，有多种方法可以覆盖这一限制。对于扭曲的kagome量子磁铁y-kapellasite，y $ _3 $ _3 $ cu $ _9 $（oh）$ _ {19} $ cl $ _8 $，在此处进行审查，可以通过三分元素兴奋的整个Brillouin区域在整个Brillouin区域中访问国家密度。这种机制得到了三种不同的磁性旋转和扭曲的kagome晶格中强的短距离相关性的帮助。 THZ时域实验的结果与线性自旋波理论非常吻合。放松光子的常规区域中心约束为物质中的探针磁性提供了一个新的方面。
Due to the small photon momentum, optical spectroscopy commonly probes magnetic excitations only at the center of the Brillouin zone; however, there are ways to override this restriction. In the case of the distorted kagome quantum magnet Y-kapellasite, Y$_3$Cu$_9$(OH)$_{19}$Cl$_8$, under scrutiny here, the magnon density of states can be accessed over the entire Brillouin zone through three-center magnon excitations. This mechanism is aided by the three different magnetic sublattices and strong short-range correlations in the distorted kagome lattice. The results of THz time-domain experiments agree remarkably well with linear spin-wave theory. Relaxing the conventional zone-center constraint of photons gives a new aspect to probe magnetism in matter.
