Quality Heterostructures from Two-Dimensional Crystals Unstable in Air by Their Assembly in Inert Atmosphere
Yang Cao,Artem Mishchenko,Geliang Yu,Ekaterina Khestanova,A. P. Rooney,Eric Prestat,Andrey V. Kretinin,Peter Blake,Moshe Ben Shalom,Colin R. Woods,J. Chapman,Geetha Balakrishnan,Irina V. Grigorieva,Konstantin S. Novoselov,Benjamin A. Piot,Marek Potemski,Kenji Watanabe,T. Taniguchi,Sarah J. Haigh,Andre K. Geim,Roman V. Gorbachev +20 more
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TLDR
A remedial approach based on cleavage, transfer, alignment, and encapsulation of air-sensitive crystals, all inside a controlled inert atmosphere, which offers a venue to significantly expand the range of experimentally accessible two-dimensional crystals and their heterostructures.Abstract:
Many layered materials can be cleaved down to individual atomic planes, similar to graphene, but only a small minority of them are stable under ambient conditions. The rest react and decompose in air, which has severely hindered their investigation and potential applications. Here we introduce a remedial approach based on cleavage, transfer, alignment, and encapsulation of air-sensitive crystals, all inside a controlled inert atmosphere. To illustrate the technology, we choose two archetypal two-dimensional crystals that are of intense scientific interest but are unstable in air: black phosphorus and niobium diselenide. Our field-effect devices made from their monolayers are conductive and fully stable under ambient conditions, which is in contrast to the counterparts processed in air. NbSe2 remains superconducting down to the monolayer thickness. Starting with a trilayer, phosphorene devices reach sufficiently high mobilities to exhibit Landau quantization. The approach offers a venue to significantly ex...read more
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Ultra-thin van der Waals crystals as semiconductor quantum wells.
Johanna Zultak,Samuel Magorrian,Maciej Koperski,Alistair Garner,Matthew J. Hamer,Endre Tóvári,Kostya S. Novoselov,Alexander Zhukov,Yichao Zou,Neil R. Wilson,Sarah J. Haigh,Andrey V. Kretinin,Vladimir I. Fal'ko,Roman V. Gorbachev +13 more
TL;DR: The authors leverage the thickness of exfoliated 2D crystals to control the quantum well dimensions in few-layer semiconductor InSe and investigate the resonance features in the tunnelling current, photoabsorption and light emission spectra.
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Optical second harmonic generation in encapsulated single-layer InSe
Nadine Leisgang,Jonas G. Roch,Guillaume Froehlicher,Matthew J. Hamer,Daniel J. Terry,Roman V. Gorbachev,Richard J. Warburton +6 more
TL;DR: In this article, the second harmonic generation (SHG) was used to determine the crystal angles in single-layer indium selenide (InSe) and to relate the sharp edges of the flake to the armchair and zigzag edges of crystal structure.
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Effect of aging-induced disorder on the quantum transport properties of few-layer WTe 2
Wei Lai Liu,Wei Lai Liu,Mao-Lin Chen,Mao-Lin Chen,Xiaoxi Li,Xiaoxi Li,Sudipta Dubey,Ting Xiong,Ting Xiong,Zhi Ming Dai,Zhi Ming Dai,Jun Yin,Wan Lin Guo,Jin Long Ma,Ya Ni Chen,Jun Tan,Jun Tan,Da Li,Da Li,Zhen Hua Wang,Zhen Hua Wang,Wu Li,Vincent Bouchiat,Dong-Ming Sun,Dong-Ming Sun,Zheng Han,Zheng Han,Zhidong Zhang,Zhidong Zhang +28 more
TL;DR: In this article, the performance of low-temperature quantum electronic transport of few-layer transition metal dicalcogenides (WTe2) was investigated and the correlation between the unusual magnetotransport and disorder in WTe2 was revealed.
Journal ArticleDOI
Semiconducting van der Waals Interfaces as Artificial Semiconductors.
TL;DR: The results presented here further illustrate how van der Waals interfaces of two distinct 2D semiconductor materials are composite systems that truly behave as artificial semiconductors, the properties of which can be deterministically defined by the selection of the appropriate constituent semiconducting monolayers.
Journal ArticleDOI
Anisotropic features in the electronic structure of the two-dimensional transition metal trichalcogenide TiS3: electron doping and plasmons
José Ángel Silva-Guillén,Enric Canadell,Pablo Ordejón,Francisco Guinea,Francisco Guinea,Rafael Roldán +5 more
TL;DR: In this paper, the effect of spin-orbit coupling in the band dispersion was analyzed for TiS3 single-layer single-layers with anisotropic plasmons, with opposite anisotropy for the electron and hole bands.
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