Pseudo-particles picture in single-hole-doped two-dimensional Néel ordered antiferromagnet
Pseudo-particles picture in single-hole-doped two-dimensional Néel ordered antiferromagnet
复制标题
单孔掺杂二维尼尔有序反铁磁体中的赝粒子图
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Pires
中科院分区：
文献类型：
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作者：
A. Pereira;E. Ercolessi;A. Pires
利用非单连通流形上的非线性σ模型，研究了二维量子反铁磁系统中的基本激发(磁子和天子)与静态自旋空位(空穴)之间的相互作用效应。空洞分散磁子并捕获天空粒子。得到了散射磁子的相移，并用它计算了相对于真空测量的自旋波的零点能量。结果表明，零点能量降低了从晶格中去除自旋的能量成本。我们还研究了存在磁子时的天米子-空穴相互作用和天米子-空穴(半天米-空穴)束缚态的问题。我们认为，当两个相邻的非磁性杂质位于半天子群的中心时，它们会被吸引。
Using the nonlinear σ model on a non-simply connected manifold, we consider the interaction effects between the elementary excitations (magnons and skyrmions) and static spin vacancy (hole) in two-dimensional quantum antiferromagnetic systems. Holes scatter magnons and trap skyrmions. The phase-shifts of the scattered magnons are obtained and used to calculate the zero point energy of spin waves measured with respect to the vacuum. It is suggested that this zero point energy lowers the energy cost of removing spins from the lattice. We also study the problems of the skyrmion–hole interactions and the skyrmion–hole (half-skyrmion–hole) bound states in the presence of magnons. We argue that two adjacent non-magnetic impurities are attracted when they are placed at the centre of half-skyrmions.