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arXiv 2412.05511cond-mat.mes-hallcond-mat.mtrl-sci
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二维CrPS$_{4}$中可调的线性和非线性反常霍尔输运

Tunable linear and nonlinear anomalous Hall transport in two-dimensional CrPS$_{4}$

Lulu Xiong, Jin Cao, Fan Yang, Xiaoxin Yang, Shen Lai, Xian-Lei Sheng, Cong Xiao, Shengyuan A. Yang

AI总结:

通过第一性原理计算,发现二维CrPS$_{4}$中单层和双层分别表现出线性与非线性反常霍尔效应,且双层线性效应可由电场或磁场调控,揭示了层依赖的霍尔输运物理。

摘要:

少层CrPS$_{4}$是一种在环境条件下具有优异稳定性的二维(2D)磁性材料,在近期研究中引起了广泛关注。本文通过第一性原理计算表明,二维CrPS$_{4}$由于其层依赖的磁性和对称性特征,承载了多种反常霍尔输运现象。单层CrPS$_{4}$可以表现出显著的线性反常霍尔效应,而其非线性反常霍尔响应则被禁止。相比之下,双层CrPS$_{4}$在不存在线性反常霍尔效应的情况下,能够通过Berry联络极化率产生显著的内禀非线性反常霍尔响应。我们阐明这些响应中的大峰源于能带结构中的有间隙狄拉克点。此外,我们展示了通过栅极电场或面内磁场打破时空反演对称性,可以在双层CrPS$_{4}$中诱导并调控线性反常霍尔效应。我们的发现揭示了二维CrPS$_{4}$磁体中有趣的层依赖霍尔输运物理,表明其在电子和自旋电子器件应用中的潜力。

英文摘要:

Few-layer CrPS$_{4}$ is a two-dimensional (2D) magnetic material with excellent stability in ambient environment, which attracted significant interest in recent research. Here, via first-principles calculations, we show that 2D CrPS$_{4}$ hosts a variety of anomalous Hall transport phenomena, owing to its layer-dependent magnetism and symmetry character. Monolayer CrPS$_{4}$ can display a sizable linear anomalous Hall effect, while its nonlinear anomalous Hall response is forbidden. In contrast, bilayer CrPS$_{4}$ can produce pronounced intrinsic nonlinear anomalous Hall response from Berry-connection polarizability, in the absence of linear anomalous Hall effect. We clarify that the large peaks in these responses originate from gapped Dirac points in the band structure. Furthermore, we show that linear anomalous Hall effect can be induced and controlled in bilayer CrPS$_{4}$ by gate electric field or in-plane magnetic field, which break the spacetime inversion symmetry. Our findings unveil the interesting layer-dependent Hall transport physics in 2D CrPS$_{4}$ magnets, suggesting its potential in electronic and spintronic device applications.

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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