Department of Physics, Harbin Institute of Technology, Harbin, China.
Phys Chem Chem Phys. 2019 Oct 7;21(37):21022-21029. doi: 10.1039/c9cp03395e. Epub 2019 Sep 17.
A recently synchronized Janus TMD material with broken out-of-plane symmetry offers a vertical dipole to enhance nonlinear optical behavior. Here, by comparing the second harmonic generation properties of MoS and MoSSe monolayers, we investigated the nonzero out-of-plane SHG susceptibilities of a Janus MoSSe 2D material. A three-fold enhancement of out-of-plane SHG susceptibilities exists in three stacked bulks of Janus MoSSe compared to that in the monolayer. A sensitivity to their stack pattern is also found. The broken out-of-plane symmetry, vertical dipole, and intrinsic tunable electronic properties of Janus two-dimensional materials make MoSSe a promising nanomaterial for nonlinear optical devices.
最近具有非共面对称性破缺的 Janus TMD 材料提供了垂直偶极子，以增强非线性光学行为。在这里，通过比较 MoS 和 MoSSe 单层的二次谐波产生特性，我们研究了 Janus MoSSe 2D 材料的非零面外 SHG 磁导率。与单层相比，在三个堆叠的 Janus MoSSe 体中存在面外 SHG 磁导率的三倍增强。还发现了它们的堆叠模式的敏感性。Janus 二维材料的非共面对称性破缺、垂直偶极子和固有可调谐电子特性使得 MoSSe 成为用于非线性光学器件的有前途的纳米材料。
