Observation of Moir\'e Excitons in WSe2/WS2 Heterostructure Superlattices

材料科学 单层 光电子学 光致发光 带隙 电子
作者
Chenhao Jin,Emma C. Regan,Aiming Yan,M. Iqbal Bakti Utama,Danqing Wang,Ying Qin,Sijie Yang,Zhiren Zheng,Kenji Watanabe,Takashi Taniguchi,Sefaattin Tongay,Alex Zettl,Feng Wang
出处
期刊:arXiv: Mesoscale and Nanoscale Physics 被引量:427
标识
DOI:10.1038/s41586-019-0976-y
摘要

Moir\'e superlattices provide a powerful tool to engineer novel quantum phenomena in two-dimensional (2D) heterostructures, where the interactions between the atomically thin layers qualitatively change the electronic band structure of the superlattice. For example, mini-Dirac points, tunable Mott insulator states, and the Hofstadter butterfly can emerge in different types of graphene/boron nitride moir\'e superlattices, while correlated insulating states and superconductivity have been reported in twisted bilayer graphene moir\'e superlattices. In addition to their dramatic effects on the single particle states, moir\'e superlattices were recently predicted to host novel excited states, such as moir\'e exciton bands. Here we report the first observation of moir\'e superlattice exciton states in nearly aligned WSe2/WS2 heterostructures. These moir\'e exciton states manifest as multiple emergent peaks around the original WSe2 A exciton resonance in the absorption spectra, and they exhibit gate dependences that are distinctly different from that of the A exciton in WSe2 monolayers and in large-twist-angle WSe2/WS2 heterostructures. The observed phenomena can be described by a theoretical model where the periodic moir\'e potential is much stronger than the exciton kinetic energy and creates multiple flat exciton minibands. The moir\'e exciton bands provide an attractive platform to explore and control novel excited state of matter, such as topological excitons and a correlated exciton Hubbard model, in transition metal dichalcogenides.
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