Critical exciton annihilation: Diffusion, percolation or anderson transition?

Diffusion Poles and the Anderson Transition

In the recent series of papers (cond-mat/0402471, cond-mat/0403618, condmat/0407618, cond-mat/0501586), Janis and Kolorenc discussed the role of the diffision poles in the Anderson transition theory. Their picture contradicts the general principles and is shown below to be completely misleading. Correct setting of the problem is given and the contemporary situation is discussed. The critical re...

Exciton-exciton annihilation in MoSe2 monolayers

Nardeep Kumar,1 Qiannan Cui,1 Frank Ceballos,1 Dawei He,2 Yongsheng Wang,2,* and Hui Zhao1,† 1Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, USA 2Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China (Received 4 October 2013; revised manuscr...

Diffusion-limited exciton-exciton annihilation in single-walled carbon nanotubes: A time-dependent analysis

To provide physical insight into the recently observed photoluminescence saturation behavior in singlewalled carbon nanotubes implying the existence of an upper limit of exciton densities, we have performed a time-dependent theoretical study of diffusion-limited exciton-exciton annihilation in the general context of reaction-diffusion processes, for which exact treatments exist. By including th...

Onset of exciton-exciton annihilation in single-layer black phosphorus

Observation of rapid exciton-exciton annihilation in monolayer molybdenum disulfide.

Monolayer MoS2 is a direct-gap two-dimensional semiconductor that exhibits strong electron-hole interactions, leading to the formation of stable excitons and trions. Here we report the existence of efficient exciton-exciton annihilation, a four-body interaction, in this material. Exciton-exciton annihilation was identified experimentally in ultrafast transient absorption measurements through th...