稀磁半导体中非共线磁极化子驱动的霍尔效应
Hall effect driven by non-collinear magnetic polarons in diluted magnetic semiconductors
摘要：
本文发展了稀磁半导体（DMS）中由非共线磁织构驱动的霍尔效应（拓扑霍尔效应- THE）理论。我们证明了载流子自旋轨道相互作用在束缚磁极化子（BMP）内部诱导了手性磁有序。非共线BMP的内部结构由自旋轨道耦合的类型控制，允许创建skyrmion-（Rashba）或antiskyrmion-样（Dresselhaus）配置。巡游载流子在极化子上的非对称散射导致了霍尔信号，这种信号存在于弱的外磁场和低温下。我们指出，DMS为基础的系统允许一个实验研究的载体自旋极化和非共线的磁性织构形状的依赖。
英文摘要：
In this letter we develop the theory of Hall effect driven by non-collinear magnetic textures (topological Hall effect - THE) in diluted magnetic semiconductors (DMS). We show that a carrier spin-orbit interaction induces a chiral magnetic ordering inside a bound magnetic polaron (BMP). The inner structure of non-collinear BMP is controlled by the type of spin-orbit coupling, allowing to create skyrmion- (Rashba) or antiskyrmion-like (Dresselhaus) configurations. The asymmetric scattering of itinerant carriers on polarons leads to the Hall signal which exists in weak external magnetic fields and low temperatures. We point out that DMS-based systems allow one to investigate experimentally the dependence of THE both on a carrier spin polarization and on a non-collinear magnetic texture shape.
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