论文标题
在稀释的自旋系统的自旋特性模型中的巡回铁磁性
Itinerant ferromagnetism in a spin-fermion model for diluted spin systems
论文作者
论文摘要
我们使用稀释的自旋特性模型研究了巡回的铁磁磁性，该模型源自排斥的哈伯德模型，在该模型中，在三维简单的立方晶格中，巡回的费米子在抗铁磁场上与辅助磁场耦合到辅助场。我们尤其将重点放在理解杂质带中流动费用的自旋依赖性运输特性，通过考虑辅助场的位置障碍。对于现场排斥$ u $ $ \ sim $ bandwidth的巡回携带者的密度限制在杂质带上，在确定系统的动能以及载体旋转极化方面发挥了关键作用。我们的半古典蒙特卡洛计算表明，载体旋转的铁磁过渡温度确实显示出载体密度的优化行为。我们计算详细的传输特性，以在载体的磁和传输特性之间建立一对一的对应关系。我们在扰动状态以外获得的结果对于理解稀释的磁性半导体中的铁磁性很重要。
We investigate the itinerant ferromagnetism using a diluted spin-fermion model, derived from a repulsive Hubbard model, where itinerant fermions are coupled antiferromagnetically to auxiliary fields in a three-dimensional simple cubic lattice. We focus, in particular, on understanding the spin-dependent transport properties of the itinerant fermions in the impurity band by taking positional disorder of the auxiliary fields into account. For on-site repulsion $U$ $\sim$ bandwidth the density of the itinerant carriers confined to the impurity band, play a key role in determining the kinetic energy of the system and consequently the carrier spin polarization. Our semi-classical Monte Carlo calculations show that the ferromagnetic transition temperature of the carrier spins indeed shows an optimization behavior with the carrier density. We calculate the transport properties in details to establish a one-to-one correspondence between the magnetic and transport properties of the carriers. Our results obtained beyond the perturbative regime are significant for understanding the ferromagnetism in diluted magnetic semiconductors.
