Signatures of moiré-trapped valley excitons in MoSe2 /WSe2 heterobilayers

Nature
Kyle L SeylerXiaodong Xu

Abstract

The formation of moiré patterns in crystalline solids can be used to manipulate their electronic properties, which are fundamentally influenced by periodic potential landscapes. In two-dimensional materials, a moiré pattern with a superlattice potential can be formed by vertically stacking two layered materials with a twist and/or a difference in lattice constant. This approach has led to electronic phenomena including the fractal quantum Hall effect1-3, tunable Mott insulators4,5 and unconventional superconductivity6. In addition, theory predicts that notable effects on optical excitations could result from a moiré potential in two-dimensional valley semiconductors7-9, but these signatures have not been detected experimentally. Here we report experimental evidence of interlayer valley excitons trapped in a moiré potential in molybdenum diselenide (MoSe2)/tungsten diselenide (WSe2) heterobilayers. At low temperatures, we observe photoluminescence close to the free interlayer exciton energy but with linewidths over one hundred times narrower (around 100 microelectronvolts). The emitter g-factors are homogeneous across the same sample and take only two values, -15.9 and 6.7, in samples with approximate twist angles of 60 degrees ...Continue Reading

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Citations

Jul 25, 2019·Advanced Materials·Po-Yen ChenYi-Hsien Lee
Aug 15, 2019·Chemical Society Reviews·Jizhou JiangAndrew T S Wee
Dec 7, 2019·Nanoscale·Huilin WangDongfeng Xue
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Jun 6, 2019·Nature Communications·Shenyang HuangHugen Yan
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Dec 29, 2019·Scientific Reports·Jing-Yang YouGang Su
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Jul 15, 2020·Nature Materials·Mingyuan ChenSiyuan Dai
Oct 22, 2019·Physical Review Letters·Valentin CrépelNicolas Regnault

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Methods Mentioned

BETA
scanning tunnelling microscopy
atomic force microscopy

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