Evidence for moiré excitons in van der Waals heterostructures

Nature
Kha TranXiaoqin Li

Abstract

Recent advances in the isolation and stacking of monolayers of van der Waals materials have provided approaches for the preparation of quantum materials in the ultimate two-dimensional limit1,2. In van der Waals heterostructures formed by stacking two monolayer semiconductors, lattice mismatch or rotational misalignment introduces an in-plane moiré superlattice3. It is widely recognized that the moiré superlattice can modulate the electronic band structure of the material and lead to transport properties such as unconventional superconductivity4 and insulating behaviour driven by correlations5-7; however, the influence of the moiré superlattice on optical properties has not been investigated experimentally. Here we report the observation of multiple interlayer exciton resonances with either positive or negative circularly polarized emission in a molybdenum diselenide/tungsten diselenide (MoSe2/WSe2) heterobilayer with a small twist angle. We attribute these resonances to excitonic ground and excited states confined within the moiré potential. This interpretation is supported by recombination dynamics and by the dependence of these interlayer exciton resonances on twist angle and temperature. These results suggest the feasibilit...Continue Reading

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Citations

Jul 25, 2019·Advanced Materials·Po-Yen ChenYi-Hsien Lee
Aug 27, 2019·Advanced Materials·Soumya SarkarThirumalai Venkatesan
Dec 7, 2019·Nanoscale·Huilin WangDongfeng Xue
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 2, 2020·Nanoscale·Hui LiMingwei Chen
Oct 5, 2019·Scientific Reports·Sotiris PsilodimitrakopoulosEmmanuel Stratakis
Mar 8, 2019·Nature·Evgeny M AlexeevAlexander I Tartakovskii
Jan 11, 2020·Physical Review Letters·Ouri KarniTony F Heinz
Mar 10, 2020·Nanotechnology·Andreij C GadelhaLeonardo C Campos
Jul 15, 2020·Nature Nanotechnology·Paulina Plochocka
May 3, 2020·Nature Communications·Mengzhou LiaoGuangyu Zhang
Jul 15, 2020·Nature Materials·Mingyuan ChenSiyuan Dai
Sep 23, 2020·Nature Materials·Long Zhang, Hui Deng
Aug 29, 2020·Physical Review Letters·Xiao LinTony Low
Aug 6, 2020·The Review of Scientific Instruments·Mason J GrayKenneth S Burch
Mar 8, 2019·Nature·Bernhard Urbaszek, Ajit Srivastava
Oct 23, 2019·Nature Nanotechnology·Dmitrii UnuchekAndras Kis
Dec 29, 2019·Scientific Reports·Jing-Yang YouGang Su
May 15, 2020·Nature Communications·Ioannis ParadisanosBernhard Urbaszek
Sep 13, 2020·Science Advances·H BaekB D Gerardot
May 13, 2020·Nature Materials·Long YuanLibai Huang

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Methods Mentioned

BETA
scanning tunnelling spectroscopy
optical microscopy

Software Mentioned

BerkeleyGW
Vienna ab initio simulation package ( VASP ) package

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