Moiré superlattices arising from growth induced by screw dislocations in layered materials  

作　　者：田伏钰 Muhammad Faizan 贺欣 孙远慧 张立军 Fuyu Tian;Muhammad Faizan;Xin He;Yuanhui Sun;Lijun Zhang(State Key Laboratory of Integrated Optoelectronics Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineering,Jilin University,Changchun 130012,China;Suzhou Laboratory,Suzhou 215123,China)

机构地区：[1]State Key Laboratory of Integrated Optoelectronics Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineering,Jilin University,Changchun 130012,China [2]Suzhou Laboratory,Suzhou 215123,China

出　　处：《Chinese Physics B》2024年第7期72-77,共6页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2022YFA1402500);the National Natural Science Foundation of China(Grant No.62125402)。

摘　　要：Moiré superlattices(MSLs) are modulated structures produced from homogeneous or heterogeneous two-dimensional layers stacked with a twist angle and/or lattice mismatch. Enriching the methods for fabricating MSL and realizing the unique emergent properties are key challenges in its investigation. Here we recommend that the spiral dislocation driven growth is another optional method for the preparation of high quality MSL samples. The spiral structure stabilizes the constant out-of-plane lattice distance, causing the variations in electronic and optical properties. Taking SnS_(2) MSL as an example, we find prominent properties including large band gap reduction(~ 0.4 e V) and enhanced optical activity. Firstprinciples calculations reveal that these unusual properties can be ascribed to the locally enhanced interlayer interaction associated with the Moiré potential modulation. We believe that the spiral dislocation driven growth would be a powerful method to expand the MSL family and broaden their scope of application.

关 键 词：Moirésuperlattices interlayer interaction spiral dislocation layered materials 

分 类 号：O78[理学—晶体学]