三层 van der Waals 异质结构中增强的层间中性激子与三子
介观与纳米尺度物理
2018-09-18 v5 材料科学
应用物理
摘要
垂直堆叠的 van der Waals 异质结构构成了一个有前景的平台，可通过增强的激子系统提供定制的能带排列。在此，我们报告了在三层 WSe2-MoSe2-WSe2 van der Waals 异质结构中对层间中性激子和带电激子的观测及其动力学。在低温下，与其双层异质结构相比，三层结构中增加的 WSe2 层导致了显著更高的光致发光量子产率和可调谐的光谱共振。基于自旋极化密度泛函理论的第一性原理赝势计算支持了观测到的光致发光量子产率增强，这归因于三层异质结构中显著更大的电子-空穴重叠和更高的光吸收。我们进一步揭示了三层异质结构层间中性激子和三子的温度依赖性、功率依赖性以及时间分辨光致发光。我们的研究阐明了操纵层间激子光发射以及为光电子学从头设计原子异质结构的前景。
引用
@article{arxiv.1706.05857,
title = {Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures},
author = {Chanyeol Choi and Jiahui Huang and Hung-Chieh Cheng and Hyunseok Kim and Abhinav Kumar Vinod and Sang-Hoon Bae and V. Ongun Ozcelik and Roberto Grassi and Jongjae Chae and Shu-Wei Huang and Xiangfeng Duan and Kristen Kaasbjerg and Tony Low and Chee Wei Wong},
journal= {arXiv preprint arXiv:1706.05857},
year = {2018}
}
备注
25 pages, 5 figures(Maintext). 9 pages, 7 figures(Supplementary Information). - Accepted for publication in npg: 2D materials and applications and reformatted to its standard. - Updated co-authors and references. - Title and abstract are modified for clarity. - Errors have been corrected, npg: 2D materials and applications (2018)