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arXiv 2201.12182cond-mat.str-elcond-mat.mtrl-sci
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稀释自旋系统自旋-费米子模型中的巡游铁磁性

Itinerant ferromagnetism in a spin-fermion model for diluted spin systems

Sourav Chakraborty, Sandip Halder, Kalpataru Pradhan

摘要:

我们研究了巡游铁磁性使用稀释自旋费米子模型,来自排斥哈伯德模型,其中巡游费米子反铁磁耦合辅助场在一个三维简单立方晶格。我们的重点,特别是了解自旋依赖的输运性质的巡回费米子在杂质带考虑位置无序的辅助领域。对于在位排斥$U$ $\sim$带宽,限制在杂质带中的巡游载流子的密度,在确定系统的动能和因此载流子自旋极化中起关键作用。我们的半经典蒙特卡罗计算表明,载流子自旋的铁磁转变温度确实随载流子密度表现出优化行为。我们详细计算了输运性质,建立了载流子的磁性和输运性质之间的一一对应关系。微扰区以外的结果对理解稀磁半导体的铁磁性有重要意义。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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