论文标题
Quantum Heisenberg Ferromagnets中的零马格农声
Zero-magnon sound in quantum Heisenberg ferromagnets
论文作者
论文摘要
使用功能性重归其化组方法，我们表明，在低温和一定范围内，在尺寸中量子Heisenberg ferromagnet的纵向动态结构因子$ d \ leq 2 $表现出具有良好定义的准晶体峰，具有线性分散，我们将其标识为Zero-Magnon声音。在$ d> 2 $中，可用于衰减到横向旋转波的较大相空间仅导致以零频率为中心的宽阔驼峰，其宽度在动量中线性地线性缩放。
Using a functional renormalization group approach we show that at low temperatures and in a certain range of magnetic fields the longitudinal dynamic structure factor of quantum Heisenberg ferromagnets in dimensions $D\leq 2$ exhibits a well-defined quasi-particle peak with linear dispersion that we identify as zero-magnon sound. In $D>2$ the larger phase space available for the decay into transverse spin waves leads only to a broad hump centered at zero frequency whose width scales linearly in momentum.
