Observation of moiré excitons in WSe2 /WS2 heterostructure superlattices

Nature
Chenhao JinFeng Wang

Abstract

Moiré superlattices enable the generation of new quantum phenomena in two-dimensional heterostructures, in which 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 pattern can emerge in different types of graphene/boron nitride moiré superlattices, whereas correlated insulating states and superconductivity have been reported in twisted bilayer graphene moiré superlattices1-12. In addition to their pronounced effects on single-particle states, moiré superlattices have recently been predicted to host excited states such as moiré exciton bands13-15. Here we report the observation of moiré superlattice exciton states in tungsten diselenide/tungsten disulfide (WSe2/WS2) heterostructures in which the layers are closely aligned. These moiré 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 distinct from that of the A exciton in WSe2 monolayers and in WSe2/WS2 heterostructures with large twist angles. These phenomena can be described by a theoretical model in w...Continue Reading

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Citations

Sep 5, 2019·Chemical Communications : Chem Comm·Yu Kyoung RyuAndres Castellanos-Gomez
Dec 12, 2019·Chemical Society Reviews·Xuhai LiuHaibo Zeng
Jan 3, 2020·Physical Chemistry Chemical Physics : PCCP·Chaoqiang XuXudong Xiao
Apr 4, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Thorsten DeilmannUrsula Wurstbauer
Jun 21, 2019·Nature Materials·Steven T Cundiff
Sep 26, 2020·Physical Chemistry Chemical Physics : PCCP·Shuai ZhangYu Jia
Oct 5, 2019·Scientific Reports·Sotiris PsilodimitrakopoulosEmmanuel Stratakis
Jun 5, 2020·Science Advances·A I BerdyuginV I Fal'ko
Jul 23, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Liheng AnNing Wang
Mar 8, 2019·Nature·Bernhard Urbaszek, Ajit Srivastava
Oct 22, 2019·Physical Review Letters·Valentin CrépelNicolas Regnault
Dec 29, 2019·Scientific Reports·Jing-Yang YouGang Su
May 3, 2020·Nature Communications·Mengzhou LiaoGuangyu Zhang
May 29, 2020·Nature Materials
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May 15, 2020·Nature Communications·Ioannis ParadisanosBernhard Urbaszek

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Methods Mentioned

BETA
optical
transmission electron microscopy
scanning tunnelling microscopy
electron-beam lithography
chip

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