Affiliation:
1. Institute of Modern Optics Tianjin Key Laboratory of Micro‐scale Optical Information Science and Technology Nankai University Tianjin 300350 China
2. School of Physics State Key Laboratory for Mesoscopic Physics Academy for Advanced Interdisciplinary Studies Collaborative Innovation Center of Quantum Matter Nano‐optoelectronics Frontier Center of Ministry of Education Peking University Beijing 100871 China
Abstract
AbstractArtificially molding exciton flux is the cornerstone for developing promising excitonic devices. In the emerging hetero/homobilayers, the spatial separated charges prolong exciton lifetimes and create out‐plane dipoles, facilitating electrically control exciton flux on a large scale, and the nanoscale periodic moiré potentials arising from twist‐angle or/and lattice mismatch can substantially alter exciton dynamics, which are mainly proved in the heterostructures. However, the spatially indirect excitons dynamics in homobilayers without lattice mismatch remain elusive. Here the nonequilibrium dynamics of indirect exciton in homobilayers are systematically investigated. The homobilayers with slightly twist‐angle can induce a deep moiré potential (>50 meV) in the energy landscape of indirect excitons, resulting in a strongly localized moiré excitons insulating the transport dynamics from phonons and disorder. These findings provide insights into the exciton dynamics and many‐body physics in moiré superlattices modulated energy landscape, with implications for designing excitonic devices operating at room temperature.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry