MoSe2/WS2 moirir异质结中相关态层依赖性的分离与鉴定

IF 6.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Yuze Meng, Zenghui Wang
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引用次数: 0

摘要

二维莫尔维尔超晶格的出现由于其丰富的相关物理而引起了人们的强烈研究兴趣。与基于石墨烯的体系相比,基于过渡金属二硫族化物的moirir超晶格具有更高的转变温度、更坚固的平带和更丰富的相关态,可以更好地实现这些物理现象。然而,由于各种技术挑战,某些异质结的层自由度在很大程度上仍未被探索。在这项工作中,我们通过设计的样品结构排除了MoSe2/WS2 moirir角度的影响,分离、识别和研究了MoSe2/WS2 moirir异质结中的层依赖关系,并观察了不同层数样品之间的显著差异。在单层MoSe2/单层WS2 moirir异质结中,我们观察到相关态的光谱特征发生了不寻常的变化,揭示了极化子和激子之间的竞争优势。在双层MoSe2/单层WS2莫尔莫尔异质结中,我们观察到层调制莫尔莫尔激子的明显特征,我们进一步使用探针揭示了相关态的电场调谐。我们的研究证明了MoSe2/WS2莫尔结作为探索多体物理和工程新兴量子态的令人兴奋的领域所提供的有趣机会。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isolating and identification of layer dependence of correlated states in MoSe2/WS2 moiré heterojunction

The emergence of two-dimensional moiré superlattice has sparked intense research interest thanks to its rich correlated physics. Compared with graphene-based systems, moiré superlattices based on transitional metal dichalcogenides facilitate better access to such physical phenomena, with higher transition temperatures, more robust flat bands, and richer correlated states. However, the layer degree freedom in certain heterojunctions has remained largely unexplored due to various technical challenges. In this work, by excluding the effect of the moiré angle through a designed sample structure, we isolate, identify, and investigate the layer dependence in an MoSe2/WS2 moiré heterojunction, and observe striking contrasts between samples with different numbers of layers. In the monolayer MoSe2/monolayer WS2 moiré heterojunction, we observe an unusual alternation in the spectroscopic features of the correlated states, revealing competition between polaron and exciton dominances. In bilayer MoSe2/monolayer WS2 moiré heterojunction, we observe a clear signature oflayer-modulated moiré excitons, which we further use a probe to reveal the electric field tuning of the correlated states. Our study demonstrates the intriguing opportunities offered by the MoSe2/WS2 moiré heterojunction as an exciting playground for exploring many-body physics and engineering emerging quantum states.

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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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