Optical fingerprints of two-dimensional interlayer-sliding multiferroic materials,Physical Review B

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Optical fingerprints of two-dimensional interlayer-sliding multiferroic materials
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-10 , DOI: 10.1103/physrevb.110.125413
Hong-Miao Zhao ₁ , Hang Zhou _{1,

2,

3} , Wei Gan ₁ , Hui Han _{1,

1} , Hui Li _{1,

1} , Rui-Chun Xiao _{1,

1}

Affiliation

Recently, two-dimensional (2D) interlayer-sliding multiferroic materials, consisting of two nonferroelectric monolayer ferromagnetic (FM) layers with specific interlayer stacking and sliding, have garnered significant interest for their potential in expanding the range of 2D multiferroics. However, the low-dimensional nature of 2D multiferroic materials results in relatively weak magnetic and ferroelectric (FE) properties, posing challenges for traditional detection methods in characterizing these two order parameters. In this work, we study the optical fingerprints of 2D interlayer-sliding multiferroic materials. By utilizing an abstract bilayer model, we demonstrate that the four multiferroic states

(P_{↑} N_{↑},

P_{↑} N_{↓},

P_{↓} N_{↓},

and

P_{↓} N_{↑})

are interconnected via the horizontal mirror symmetry

{\hat{M}}_{z}

, time-reversal symmetry

\hat{T}

, and their combination symmetries

{\hat{M}}_{z} \hat{T}

. Subsequently, we analyze the tensor elements associated with the optical Kerr effect and second harmonic generation (SHG) effect in multiferroic states, revealing a strong correlation between both the Kerr effect and SHG effect and the multiferroic orders of 2D interlayer-sliding multiferroic materials, as well as the presence of distinct optical characteristics across different multiferroic states. Using

{VSe}_{2}

and

{MnBi}_{2} {Te}_{4}

as two representative 2D interlayer-sliding multiferroic materials, we further validate the intricate correlations between the symmetries and optical properties. Our research provides theoretical guidance for characterizing 2D interlayer-sliding multiferroic materials by means of optical methods.

中文翻译：

二维层间滑动多铁材料的光学指纹

最近，二维（2D）层间滑动多铁性材料由两个具有特定层间堆叠和滑动的非铁电单层铁磁（FM）层组成，因其在扩展2D多铁性材料范围方面的潜力而引起了人们的极大兴趣。然而，二维多铁材料的低维性质导致其磁性和铁电（FE）特性相对较弱，这对传统检测方法表征这两个阶参数提出了挑战。在这项工作中，我们研究了二维层间滑动多铁材料的光学指纹。通过利用抽象双层模型，我们证明了四种多铁态