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arXiv 2401.04582cond-mat.mes-hallcond-mat.str-el
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倾斜反铁磁体/重金属异质结中的拓扑横向自旋输运

Topological transverse spin transport in a canted antiferromagnet/heavy metal heterostructure

Wesley Roberts, Bowen Ma, Martin Rodriguez-Vega, Gregory A. Fiete

AI总结:

本研究理论探究倾斜反铁磁绝缘体中自旋能斯特效应的产生条件,发现反演对称性破缺可诱导拓扑自旋能斯特效应,解释相关实验现象并为调控该效应提供通用推导思路。

摘要:

我们从理论上研究了自旋能斯特效应——即由施加的温度梯度诱导的横向自旋流——能够在倾斜反铁磁绝缘体(如${\ m LaFeO_3}$及同家族其他材料)中发生的条件。自旋能斯特效应可为${\ m LaFeO_3}$/Pt异质结中实验观测到的反常热电压提供微观机制,该实验中当平行于界面的温度梯度施加于${\ m LaFeO_3}$时,自旋会穿过绝缘体/金属界面发生转移[W. Lin等人,Nat. Phys. 第18卷,800页(2022)]。我们发现,当在平行于施加温度梯度且平行于自旋输运方向的轴上破缺反演对称性时,${\ m LaFeO_3}$会表现出拓扑自旋能斯特效应,这可导致自旋穿过绝缘体/金属界面注入。本工作对对称性破缺诱导的自旋能斯特效应进行了一般性推导,可为在原本不会产生该效应的系统中构建有限自旋能斯特效应开辟路径。

英文摘要:

We theoretically study the conditions under which a spin Nernst effect - a transverse spin current induced by an applied temperature gradient - can occur in a canted antiferromagnetic insulator, such as ${\rm LaFeO_3}$ and other materials of the same family. The spin Nernst effect may provide a microscopic mechanism for an experimentally observed anomalous thermovoltage in ${\rm LaFeO_3}$/Pt heterostructures, where spin is transferred across the insulator/metal interface when a temperature gradient is applied to ${\rm LaFeO_3}$ parallel to the interface [W. Lin ${\it et \; al}$, Nat. Phys. ${\bf 18}$, 800 (2022)]. We find that ${\rm LaFeO_3}$ exhibits a topological spin Nernst effect when inversion symmetry is broken on the axes parallel to both the applied temperature gradient and the direction of spin transport, which can result in a spin injection across the insulator/metal interface. Our work provides a general derivation of a symmetry-breaking-induced spin Nernst effect, which may open a path to engineering a finite spin Nernst effect in systems where it would otherwise not arise.

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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