.png){kind=icon}
返回
Two-Dimensional Exciton Oriented Diffusion via Periodic Potentials
.png){kind=icon}
PRE
AI
DOI：10.1021/acsnano.4c05723.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Excitonic devices operate based on excitons, which can be excited by photons as well as emitting photons and serve as a medium for photon-carrier conversion. Excitonic devices are expected to combine the advantages of both the high response rate of photonic devices and the high integration of electronic devices simultaneously. However, because of the neutral feature, exciton transport is generally achieved via diffusion rather than using electric fields, and the efficient control of exciton flux directionality has always been difficult. In this work, a precisely designed one-dimensional periodic nanostructure (1DPS) is used to introduce periodic strain field along with resonant mode to the WS2 monolayer, achieving exciton oriented diffusion with a 7.6-fold exciton diffusion coefficient enhancement relative to that of intrinsic, while enhancing the excitonic emission intensity by a factor of 10 and reducing exciton saturation threshold power by 2 orders of magnitude. Based on the analysis of the density functional theory (DFT) and the finite-element method (FEM), we attribute the anisotropy of exciton diffusion to exciton funneling induced by periodic potentials, which do not require excessive potential height difference for an efficient oriented diffusion. As a result of resonant emission, the exciton diffusion is dragged into the nonlinear regime owing to the high exciton density close to saturation, which improves the exciton diffusion coefficient and diffusion anisotropy more appreciably.
Keyword:
two-dimensional exciton
exciton diffusion
strain field
periodic potentials
exciton funneling
期刊
IF:
16
论文数:
2.7W
被引数:
25.6W
机构
引用论文
Strain-engineered artificial atom as a broad-spectrum solar energy funnel应变工程人工原子作为广谱太阳能漏斗.png)
NATURE PHOTONICS
NATURE PHOTONICSIF32.9
PREAI
分享收藏Valley-polarized exciton currents in a van der Waals heterostructure范德华异质结构中的谷极化激子电流NATURE NANOTECHNOLOGY
OAAI
NATURE NANOTECHNOLOGYIF34.9
OAAI分享收藏Remote Lightening and Ultrafast Transition: Intrinsic Modulation of Exciton Spatiotemporal Dynamics in Monolayer MoS2远程闪电和超快跃迁: 单层MoS2中激子时空动力学的固有调制ACS NANO
ACS NANOIF16
PREAI
分享收藏
查看更多内容