Valley polarization caused by crystalline symmetry breaking,Materials Horizons

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Valley polarization caused by crystalline symmetry breaking
Materials Horizons ( IF 12.2 ) Pub Date : 2020-10-29 , DOI: 10.1039/d0mh01441a
Yuanyuan Wang ₁ , Wei Wei ₁ , Fengping Li ₁ , Xingshuai Lv ₁ , Baibiao Huang ₁ , Ying Dai ₁

Affiliation

In two-dimensional (2D) hexagonal lattices with inversion asymmetry, time-reversal (T) connected valleys are at the center of current valleytronic research. In order to trigger valley polarization, dynamical processes and/or magnetism have been considered. In this work, we propose a new mechanism, valley-contrasting sublattice polarization (VCSP), to polarize valleys by reducing the crystalline symmetry that connects the valleys. In our mechanism, significant valley polarization could be readily generated without magnetism, an electric field, or an optical process. Based on tight-binding model analysis and first-principle calculations, the control of valley polarization via crystalline symmetry can be successfully realized in concrete LaOBiS₂ polytypes with Peierls-like structure distortion. Our results provide an unprecedented possibility for exploring valley-contrasting physics.

中文翻译：

晶体对称性破缺引起的谷极化

在具有反演不对称性的二维 (2D) 六边形晶格中，时间反转 ( T ) 连接的谷是当前谷电子学研究的中心。为了触发谷极化，已经考虑了动力学过程和/或磁性。在这项工作中，我们提出了一种新机制，谷对比亚晶格极化（VCSP），通过减少连接谷的晶体对称性来极化谷。在我们的机制中，无需磁场、电场或光学过程就可以很容易地产生明显的谷极化。基于紧束缚模型分析和第一性原理计算，可以在混凝土LaOBiS _{2 中}成功实现通过晶体对称性控制谷极化具有类似 Peierls 结构畸变的多型体。我们的结果为探索山谷对比物理学提供了前所未有的可能性。

更新日期：2020-11-27

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