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Excitonic complexes and optical gain in two-dimensional molybdenum ditelluride well below the Mott transition by Wang, Zhen; Sun, Hao; Zhang, Qiyao; Feng, Jiabin; Zhang, Jianxing; Li, Yongzhuo; Ning, Cun-Zheng is a Engineering article available to read on EtoBox.
What is Excitonic complexes and optical gain in two-dimensional molybdenum ditelluride well below the Mott transition about?
Semiconductors that can provide optical gain at extremely low carrier density levels are critically important for applications such as energy efficient nanolasers. However, all current semiconductor lasers are based on traditional semiconductor materials that require extremely high density levels above the so-called Mott transition to realize optical gain. The new emerging 2D materials provide unprecedented opportunities for studying new excitonic physics and exploring new optical gain mechanisms at much lower density levels due to the strong Coulomb interaction and co-existence and mutual conversion of excitonic complexes. Here, we report a new gain mechanism involving charged excitons or trions in electrically gated 2D molybdenum ditelluride well below the Mott density. Our combined experimental and modelling study not only reveals the complex interplay of excitonic complexes well below the Mott transition but also establishes 2D materials as a new class of gain materials at densities 4–5 orders of magnitude lower than those of conventional semiconductors and provides a foundation for lasing at ultralow injection levels for future energy efficient photonic devices. Additionally,
Who reads Excitonic complexes and optical gain in two-dimensional molybdenum ditelluride well below the Mott transition?
It is typically read by researchers, students, and practitioners in Engineering.
- Author
- Wang, Zhen; Sun, Hao; Zhang, Qiyao; Feng, Jiabin; Zhang, Jianxing; Li, Yongzhuo; Ning, Cun-Zheng
- Publisher
- Nature Publishing Group; Springer Science and Business Media LLC (ISSN 2047-7538)
- Published
- 2020
- Language
- EN
- Field
- Engineering (Physical Sciences)