@article{3081b612078e4c1bbd1eb4c0601ef2db,
title = "Interlayer Exciton Transport in MoSe2/WSe2Heterostructures",
abstract = "A moir{\'e} superlattice formed by stacking two lattice mismatched transition metal dichalcogenide monolayers, functions as a diffusion barrier that affects the energy transport and dynamics of interlayer excitons (electron and hole spatially concentrated in different monolayers). In this work, we experimentally quantify the diffusion barrier experienced by interlayer excitons in hexagonal boron nitride-encapsulated molybdenum diselenide/tungsten diselenide (MoSe2/WSe2) heterostructures with different twist angles. We observe the localization of interlayer excitons at low temperature and the temperature-activated diffusivity as a function of twist angle and hence attribute it to the deep periodic potentials arising from the moir{\'e} superlattice. We further support the observations with theoretical calculations, Monte Carlo simulations, and a three-level model that represents the exciton dynamics at various temperatures.",
keywords = "exciton lifetime, exciton transport, moir{\'e} potentials, twistronics, van der Waals heterostructure",
author = "Zidong Li and Xiaobo Lu and \{Cordovilla Leon\}, \{Darwin F.\} and Zhengyang Lyu and Hongchao Xie and Jize Hou and Yanzhao Lu and Xiaoyu Guo and Austin Kaczmarek and Takashi Taniguchi and Kenji Watanabe and Liuyan Zhao and Li Yang and Deotare, \{Parag B.\}",
note = "Funding Information: P.B.D. acknowledges partial support of this work by the National Science Foundation (NSF) grant no. DMR-1904541 and Air Force Office of Scientific Research (AFOSR) award no. FA9550-17-1-0208. D.C.L. would like to acknowledge support from the University of Michigan{\textquoteright}s Rackham Merit Fellowship and the NSF Graduate Research Fellowship Program under grant no. DGE 1256260. X.L. and L.Y. are supported by the NSF CAREER grant no. DMR-1455346 and the AFOSR grant no. FA9550-20-1-0255. L.Z. acknowledges support by the NSF CAREER grant no. DMR-1749774. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001, JSPS KAKENHI Grant Number JP20H00354 and the CREST(JPMJCR15F3), JST. The computational resources have been provided by the Stampede of TeraGrid at the Texas Advanced Computing Center (TACC) through XSEDE. The authors acknowledge Xiaheng Huang for helpful discussions on the Monte Carlo simulation. Publisher Copyright: {\textcopyright} ",
year = "2021",
month = jan,
day = "26",
doi = "10.1021/acsnano.0c08981",
language = "English",
volume = "15",
pages = "1539--1547",
journal = "ACS nano",
issn = "1936-0851",
number = "1",
}