科學問題：

1. 如(ru)何研究二維材料電荷和能量隨時間和空(kong)間的動態演化(hua)過程？

2. 如何發展具(ju)有高(gao)時空分辨能力的新型表征手段？

                                                                                      超快(kuai)顯微(wei)成像技術(shu)

超快成(cheng)像具有200 fs和300 nm的時間(jian)和空間(jian)分辨能(neng)力用于直接研究二(er)維材料激發態隨時間(jian)和空間(jian)演化(hua)的動力學過程。

利用超快泵浦探測技(ji)術直(zhi)接觀測到激子在(zai)不(bu)同時間尺度下的擴散情(qing)況并研究相關(guan)機制

代表性研究論文：

1. Long Yuan et al. Strong Dipolar Repulsion of One-Dimensional Interfacial Excitons in Monolayer Lateral Heterojunctions，ACS Nano 2023, 17, 16, 15379–15387

2. Long Yuan et al. Manipulation of Exciton Dynamics in Single-Layer WSe2 Using a Toroidal Dielectric Metasurface, Nano Letters, 2021, 21, 23, 9930–9938.

3. Long Yuan et al. Twist-Angle-Dependent Interlayer Exciton Diffusion in WS2-WSe2 Heterobilayers, Nature Materials, 2020, 19, 617-623.

4. Long Yuan et al. Photocarrier Generation from Interlayer Charge-Transfer Transitions in WS2-Graphene Heterostructures, Science Advances,2018, 4, e1700324.

5. Tong Zhu#, Long Yuan# et al. Highly Mobile Charge-Transfer Excitons in Two-Dimensional Tetracene-WS2 Heterostructures, Science Advances,2018, 4, eaao3104. (#co-first author)

6. Long Yuan et al. Exciton Dynamics, Transport, and Annihilation in Atomically Thin 2D Semiconductor, Journal of Physical Chemistry Letters, 2017, 8, 3371–3379

7. Long Yuan et al. Exciton Dynamics and Annihilation in WS2 2D Semiconductor, Nanoscale, 2015, 7, 7402-7408.