Interface-driven electrical magnetochiral anisotropy in Pt/PtMnGa bilayers

Interface-driven electrical magnetochiral anisotropy in Pt/PtMnGa bilayers
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Pt/PtMnGa 双层中界面驱动的电磁手性各向异性

DOI:
10.1063/5.0054662
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发表时间:
2020-11
影响因子:
4
通讯作者:
Jiang Y.
Jiang Y.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Meng K. K.;Chen J. K.;Miao J.;Xu X. G.;Jiang Y.

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非互易电荷传输,通常被称为手性导体中的电磁手性各向异性(EMCA),涉及现代凝聚态物理学最重要的元素。在这里,我们借助非平衡涨落定理研究了 Pt/PtMnGa (PMG) 双层中的 EMCA。 Pt/PMG 双层中的大 EMCA 可归因于界面驱动的手性传输通道的非互易响应。由于小电流区域存在较大的电荷波动,需要添加高阶 EMCA 系数,它们都是电流的函数。不对称电子散射和自旋相关散射的组合提供了 Pt/PMG 双层中 PMG 厚度相关的手性输运行为。 PMG 显着增强的反常霍尔角进一步证明了强自旋轨道耦合所改变的表面态特性。
Nonreciprocal charge transport, which is frequently termed as electrical magnetochiral anisotropy (EMCA) in chiral conductors, touches the most important elements of modern condensed matter physics. Here, we have investigated the EMCA in Pt/PtMnGa (PMG) bilayers with the assitance of nonequilibrium fluctuation theorems. Large EMCA in the Pt/PMG bilayers can be attributed to nonreciprocal response of an interface-driven chiral transport channel. Due to the presence of large charge fluctuations for small current region, higher order EMCA coefficients should be added and they are all functions of current. A combination of asymmetrical electron scattering and spin-dependent scattering furnish the PMG thickness dependent chiral transport behaviors in Pt/PMG bilayers. The dramatically enhanced anomalous Hall angle of PMG further demonstrates the modified surface state properties by strong spin-orbit coupling.
DOI: 10.1093/acprof:oso/9780199227259.001.0001
发表时间: 2004-08
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影响因子: 1.7
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期刊: --
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