Enhanced Berry Curvature Dipole and Persistent Spin Texture in the Bi(110) Monolayer,Nano Letters

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Enhanced Berry Curvature Dipole and Persistent Spin Texture in the Bi(110) Monolayer
Nano Letters ( IF 9.6 ) Pub Date : 2021-11-08 , DOI: 10.1021/acs.nanolett.1c02811
Kyung-Hwan Jin ₁ , Eunseok Oh _{1,

2} , Roland Stania ₁ , Feng Liu ₃ , Han Woong Yeom _{1,

2}

Affiliation

Nonvanishing Berry curvature dipole (BCD) and persistent spin texture (PST) are intriguing physical manifestations of electronic states in noncentrosymmetric 2D materials. The former induces a nonlinear Hall conductivity while the latter offers a coherent spin current. Based on density-functional-theory (DFT) calculations, we demonstrate the coexistence of both phenomena in a Bi(110) monolayer with a distorted phosphorene structure. Both effects are concurrently enhanced due to the strong spin–orbit coupling of Bi while the structural distortion creates internal in-plane ferroelectricity with inversion asymmetry. We further succeed in fabricating a Bi(110) monolayer in the desired phosphorene structure on the NbSe₂ substrate. Detailed atomic and electronic structures of the Bi(110)/NbSe₂ heterostructure are characterized by scanning tunneling microscopy/spectroscopy and angle-resolved-photoemission spectroscopy. These results are consistent with DFT calculations which indicate the large BCD and PST are retained. Our results suggest the Bi(110)/NbSe₂ heterostructure as a promising platform to exploit nonlinear Hall and coherent spin transport properties together.

中文翻译：

Bi(110) 单层中增强的浆果曲率偶极子和持久自旋纹理

Nonvanishing Berry 曲率偶极子 (BCD) 和持久自旋纹理 (PST) 是非中心对称二维材料中电子状态的有趣物理表现。前者诱导非线性霍尔电导率，而后者提供相干自旋电流。基于密度泛函理论 (DFT) 计算，我们证明了两种现象在具有扭曲磷烯结构的 Bi(110) 单层中的共存。由于 Bi 的强自旋轨道耦合，这两种效应同时增强，而结构畸变产生具有反转不对称性的内部面内铁电性。我们进一步成功地在 NbSe ₂衬底上以所需的磷烯结构制造了 Bi(110) 单层。Bi(110)/NbSe _{2 的}详细原子和电子结构异质结构的特征在于扫描隧道显微镜/光谱和角度分辨光发射光谱。这些结果与 DFT 计算一致，表明保留了大 BCD 和 PST。我们的结果表明 Bi(110)/NbSe ₂异质结构是一个有前途的平台，可以同时利用非线性霍尔和相干自旋输运特性。

更新日期：2021-11-24

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