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arXiv 2402.00472cond-mat.mes-hall
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手性系统中无自旋依赖传输的静电产生磁阻机制

A mechanism for electrostatically generated magnetoresistance in chiral systems without spin-dependent transport

Sytze H. Tirion, Bart J. van Wees

AI总结:

本文提出手性材料与铁磁体耦合系统中的磁阻源于静电接触电势对输运势垒的调制,该机制无需自旋输运即可解释线性响应电阻对磁化方向的敏感性及Onsager互易关系的失效。

摘要:

手性材料与铁磁体耦合体系中的电子输运现象因手性诱导自旋选择性(CISS)效应而备受关注。实验中通常观察到巨大的磁阻(MR),这被广泛认为源于自旋(依赖)输运。然而,实验结果与理论解释之间存在严重分歧,最显著的是线性响应区中Onsager互易关系的明显失效。我们为与铁磁体耦合的手性系统中的两端MR机制提供了另一种解释。为此,我们指出已有观察表明,手性材料在铁磁体上的静电接触电势依赖于磁化方向和手性。在我们的解释中,这使得输运势垒在平衡状态下、且在无偏置电流时即被磁化方向所改变。这极大地改变了通过或越过势垒的电荷输运,且不需要自旋输运。这提供了一种使线性响应电阻对磁化方向敏感的机制,同时也解释了Onsager互易关系的失效。我们提出了实验配置以确认这一替代性的MR机制。

英文摘要:

Significant attention has been drawn to electronic transport in chiral materials coupled to ferromagnets in the chirality induced spin selectivity (CISS) effect. A large magnetoresistance (MR) is usually observed which is widely interpreted to originate from spin (dependent) transport. However, there are severe discrepancies between the experimental results and theoretical interpretations, most notably the apparent failure of the Onsager reciprocity relation in the linear response regime. We provide an alternative explanation for the mechanism of the two terminal MR in chiral systems coupled to a ferromagnet. For this we point out that it was observed that the electrostatic contact potential of chiral materials on a ferromagnet depends on the magnetization direction and chirality. In our explanation this causes the transport barrier to be modified by the magnetization direction, already in equilibrium, in the absence of a bias current. This strongly alters the charge transport through/over the barrier, not requiring spin transport. This provides a mechanism that allows the linear response resistance to be sensitive to the magnetization direction and also explains the failure of the Onsager reciprocity relations. We propose experimental configurations to confirm our alternative mechanism for MR.

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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