Quantum Materials by Twistronics
Twistronics 的量子材料
基本信息
- 批准号:EP/V007033/1
- 负责人:
- 金额:$ 164.36万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2021
- 资助国家:英国
- 起止时间:2021 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Two-dimensional materials (2DM), derived from bulk layered crystals with covalent intra-layer bonding and weak van der Waals (vdW) interlayer coupling, offer a versatile playground for creating quantum materials with properties tailored for particular applications. This is achieved by combining different atomically thin 2DM crystals into heterostructures layer-by-layer in a chosen sequence. Unlike conventional crystal growth, this technique is not limited by lattice matching or interface chemistry, hence, it enables us to build heterostructures from several dozens of readily available vdW crystals with diverse physical properties (electronic, optical or magnetic). This platform offers broadly acknowledged potential for the realisation of nano-devices and designer meta-materials with new properties and functionalities determined by the coupling of adjacent layers, including interlayer band hybridisation and strong proximity effects.A new degree of freedom for controlling the properties of vdW heterostructures is the mutual crystal rotation - twist - of the constituent 2D crystals. Together with the lattice mismatch of the adjacent 2D crystals it gives rise to the moiré superlattice (mSL): a periodic variation of the local atomic registry, with the period controlled by the twist angle. Even a small twist can lead to remarkable changes in the properties of heterostructures - for instance, in homobilayers of 2DM it leads to strong spectrum reconstruction and formation of electron and hole minibands. So far, the breakthrough studies of moiré superlattices have been focused on graphene heterostructures with hexagonal boron nitride and on twisted graphene bilayers. Recently, initial exploration of twisted layers of transition metal dichalcogenides have begun, featuring four letters in a single issue of Nature in March 2019 (in one of those the members of this consortium have reported moire minibands for excitons). Not surprisingly, these recent developments have fuelled a world-wide race to develop this new field of materials science and solid state physics, branded as 'twistronics'. This project will pioneer the new scientific area of twistronics in novel types of 2DM heterostructures, mapping out the limits to which one can control their properties through the interlayer proximity and moiré superlattice effects. Using this approach, we aim to engineer flat electronic bands in semiconducting 2DM heterostructures, promoting quantum many-body effects, which we will explore through quantum transport and optical studies. Furthermore, we will realise the world-first twisted bilayers of new emerging 2DMs that exhibit strongly correlated states in their natural form ((anti)ferromagnetic, charge-density waves, or superconductivity) and explore novel physics in those system with an outlook for practical applications. In all material combinations, we will look into two distinct cases of (1) intermediate twist angles, where lattices are expected to behave as rigid solids, producing smooth variation in interlayer registry and (2) small twist angles where we have recently found that twisted 2D materials reconstruct to form extended commensurate domains separated by stacking faults. To achieve the ambitious and game-changing goals of this proposal, the consortium will employ a recently commissioned world-first nanofabrication facility, which allows assembly of van der Waals heterostructures in ultra-high vacuum. This unique instrument will provide the game-changing quality materials necessary for this project. Funding of this proposal will allow us to fully employ the potential of this new instrument and deliver ground-breaking new research and disruptive technologies.
二维材料(2DM)来源于具有共价层内键和弱范德华(vdW)层间耦合的大块层状晶体,为创建具有特定应用特性的量子材料提供了一个多功能的平台。这是通过将不同的原子薄2DM晶体按选定的顺序逐层组合成异质结构来实现的。与传统晶体生长不同,该技术不受晶格匹配或界面化学的限制,因此,它使我们能够从几十个具有不同物理性质(电子,光学或磁性)的现成vdW晶体中构建异质结构。该平台为实现纳米器件和设计师超材料提供了广泛认可的潜力,这些材料具有由相邻层的耦合决定的新特性和功能,包括层间带杂化和强邻近效应。控制vdW异质结构性能的一个新的自由度是组成二维晶体的相互旋转-扭转。与相邻二维晶体的晶格失配一起,它产生了莫尔维尔超晶格(mSL):局部原子注册的周期性变化,其周期由扭转角控制。即使是很小的扭曲也会导致异质结构性质的显著变化——例如,在2DM的均匀层中,它会导致强烈的光谱重建,并形成电子和空穴微型带。到目前为止,对超晶格的突破性研究主要集中在六方氮化硼的石墨烯异质结构和扭曲的石墨烯双层结构上。最近,对过渡金属二硫族化合物扭曲层的初步探索已经开始,在2019年3月的《自然》杂志上发表了四篇文章(该联盟的一名成员在其中一篇文章中报告了激子的云纹微带)。毫不奇怪,这些最近的发展推动了世界范围内的材料科学和固态物理新领域的发展,被称为“双电子学”。该项目将在新型2DM异质结构中开辟双电子学的新科学领域,通过层间接近和摩尔超晶格效应来控制它们的性质。利用这种方法,我们的目标是在半导体2DM异质结构中设计平面电子带,促进量子多体效应,我们将通过量子输运和光学研究来探索这一效应。此外,我们将实现世界上第一个新型2dm的扭曲双层,它们在自然形式((反)铁磁性,电荷密度波或超导)中表现出强相关状态,并在这些系统中探索具有实际应用前景的新物理。在所有材料组合中,我们将研究两种不同的情况:(1)中间扭转角,其中晶格预计表现为刚性固体,在层间注册中产生平滑变化;(2)小扭转角,我们最近发现扭曲的二维材料重建形成由堆叠错误分开的扩展相称域。为了实现这一雄心勃勃的、改变游戏规则的目标,该联盟将采用最近委托的世界上第一个纳米制造设备,该设备允许在超高真空中组装范德华异质结构。这种独特的仪器将为该项目提供改变游戏规则的优质材料。这项提案的资金将使我们能够充分利用这一新工具的潜力,并提供突破性的新研究和颠覆性技术。
项目成果
期刊论文数量(10)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Semimetallic and semiconducting graphene-hBN multilayers with parallel or reverse stacking
平行或反向堆叠的半金属和半导体石墨烯-六方氮化硼多层膜
- DOI:10.48550/arxiv.2210.16393
- 发表时间:2022
- 期刊:
- 影响因子:0
- 作者:Chen X
- 通讯作者:Chen X
A Scalable Network Model for Electrically Tunable Ferroelectric Domain Structure in Twistronic Bilayers of Two-Dimensional Semiconductors.
- DOI:10.1021/acs.nanolett.1c04210
- 发表时间:2022-02-23
- 期刊:
- 影响因子:10.8
- 作者:Enaldiev, Vladimir V.;Ferreira, Fabio;Fal'ko, Vladimir, I
- 通讯作者:Fal'ko, Vladimir, I
Self-organized quantum dots in marginally twisted MoSe2/WSe2 and MoS2/WS2 bilayers
- DOI:10.1038/s41699-022-00346-0
- 发表时间:2022-10-23
- 期刊:
- 影响因子:9.7
- 作者:Enaldiev, V. V.;Ferreira, F.;Fal'ko, Vladimir, I
- 通讯作者:Fal'ko, Vladimir, I
Band energy landscapes in twisted homobilayers of transition metal dichalcogenides
- DOI:10.1063/5.0048884
- 发表时间:2021-06-14
- 期刊:
- 影响因子:4
- 作者:Ferreira, F.;Magorrian, S. J.;Fal'ko, V. I.
- 通讯作者:Fal'ko, V. I.
Non-chiral one-dimensional sates propagating inside AB/BA domain walls in bilayer graphene
双层石墨烯中 AB/BA 畴壁内传播的非手性一维状态
- DOI:10.48550/arxiv.2307.14293
- 发表时间:2023
- 期刊:
- 影响因子:0
- 作者:Enaldiev V
- 通讯作者:Enaldiev V
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Roman Gorbachev其他文献
Roman Gorbachev的其他文献
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{{ truncateString('Roman Gorbachev', 18)}}的其他基金
Precision Dry Etching of 2D Materials: 2DETCH
2D 材料的精密干法蚀刻:2DETCH
- 批准号:
EP/Z531121/1 - 财政年份:2024
- 资助金额:
$ 164.36万 - 项目类别:
Research Grant
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