论文标题
节点半法中的非线性光学响应
Nonlinear optical responses in nodal line semimetals
论文作者
论文摘要
移位电流和第二个谐波产生（SHG）是非线性光学响应，通常用于光伏效应以及材料中微妙的对称性破坏模式的检测。最近已经表明，拓扑半学，例如反转对称性损坏的Weyl半法可以产生大型的非线性光学响应。在本文中，我们研究了一类拓扑结节线半明确（NLSM）系统中的移位电流和SHG，其反转对称性损坏，这可能本质上或通过施加的电场出现。结果表明，与著名的Weyl Semimetal Systems相比，某些类别的NLSM系统提供了更单一的移位电流和SHG。
Shift current and second harmonic generation (SHG) are nonlinear optical responses that are often used for photovoltaic effect and the detection of subtle symmetry breaking patterns in materials. It has been recently shown that topological semimetals such as Weyl semimetals with broken inversion symmetry can generate large nonlinear optical responses. In this paper, we investigate both shift current and SHG in a class of topological nodal line semimetal (NLSM) systems with broken inversion symmetry, which may arise intrinsically or via an applied electric field. It is shown that certain classes of NLSM systems offer more singular shift current and SHG in comparison to the well-known Weyl semimetal systems.
