Spatially Dependent Electronic Structures and Excitons in a Marginally Twisted Moire Superlattice of Spiral WS2
Spatially Dependent Electronic Structures and Excitons in a Marginally Twisted Moire Superlattice of Spiral WS2
复制标题
螺旋 WS2 边缘扭曲莫尔超晶格中的空间相关电子结构和激子
DOI：
10.1021/acsnano.2c10562
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发表时间：
2022-12-07
期刊：
影响因子：
17.1
通讯作者：
Liu, Hongjun
中科院分区：
文献类型：
--
作者：
Peng, Jiangbo;Ren, Caixia;Liu, Hongjun
Twisted two-dimensional transition metal dichalcogenide (TMD) moire superlattices provide an additional degree of freedom to engineer electronic and optical properties. Nevertheless, controllable synthesis of marginally twisted homo TMD moire superlattices is still a challenge. Here, physical vapor deposition grown spiral WS 2 nanosheets are demonstrated to be a marginally twisted moire superlattice using scanning tunneling microscopy and spectroscopy. Periodic moire superlattices are found on the third layer (3L) and 4L of the spiral WS2 nanosheet owing to the marginally twisted alignment between two neighboring layers, resulting in a highly localized flat band near the valence band maximum. Their bandgap depends on atomic stacking configurations, which gives a good interpretation for split moire excitons using photoluminescence at 77 K. This work can benefit the development of twisted homo TMD moire superlattices and could promote the profound research of twisted TMDs in the prospective field, such as strongly correlated physics and twistronics.
