论文标题
铁磁性绝缘子
Interband magnon drag in ferrimagnetic insulators
论文作者
论文摘要
我们提出了一种新的阻力现象，一种频带磁蛋白阻力，并报告了铁磁绝缘子的磁蛋白转运中的相互作用效应和多型效应。 We study a spin-Seebeck coefficient $S_{\textrm{m}}$, a magnon conductivity $σ_{\textrm{m}}$, and a magnon thermal conductivity $κ_{\textrm{m}}$ of interacting magnons for a minimal model of ferrimagnetic insulators using a $1/S$ expansion of the Holstein-Primakoff方法，线性反应理论和Green功能的方法。我们表明，边界登录拖动增强了$σ_ {\ textrm {m}} $，并减少$κ_ {\ textrm {m}} $，而其对$ s _ {\ textrm {m}} $的总影响很小。这种阻力是由镁泥浆相互作用引起的带间动量转移引起的。我们还表明，高能带磁子有助于$ s _ {\ textrm {m}} $，$σ_{\ textrm {m}} $，而$κ_ {\ textrm {m}} $，即使对于两个乐队之间的能量差，温度也小。
We propose a new drag phenomenon, an interband magnon drag, and report on interaction effects and multiband effects in magnon transport of ferrimagnetic insulators. We study a spin-Seebeck coefficient $S_{\textrm{m}}$, a magnon conductivity $σ_{\textrm{m}}$, and a magnon thermal conductivity $κ_{\textrm{m}}$ of interacting magnons for a minimal model of ferrimagnetic insulators using a $1/S$ expansion of the Holstein-Primakoff method, the linear-response theory, and a method of Green's functions. We show that the interband magnon drag enhances $σ_{\textrm{m}}$ and reduces $κ_{\textrm{m}}$, whereas its total effects on $S_{\textrm{m}}$ are small. This drag results from the interband momentum transfer induced by the magnon-magnon interactions. We also show that the higher-energy band magnons contribute to $S_{\textrm{m}}$, $σ_{\textrm{m}}$, and $κ_{\textrm{m}}$ even for temperatures smaller than the energy difference between the two bands.
