2D or Not 2D: Strain Tuning in Weakly Coupled Heterostructures

Wang Ruining; Lange Felix R. L.; Cecchi Stefano; Hanke Michael; Wuttig Matthias; Calarco Raffaella

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2D or Not 2D: Strain Tuning in Weakly Coupled Heterostructures

机译：2D与否2D：弱耦合异质结构中的应变调整

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A route to realize strain engineering in weakly bonded heterostructures is presented. Such heterostructures, consisting of layered materials with a pronounced bond hierarchy of strong and weak bonds within and across their building blocks respectively, are anticipated to grow decoupled from each other. Hence, they are expected to be unsuitable for strain engineering as utilized for conventional materials which are strongly bonded isotropically. Here, it is shown for the first time that superlattices of layered chalcogenides (Sb2Te3/GeTe) behave neither as fully decoupled two-dimensional (2D) materials nor as covalently bonded three-dimensional (3D) materials. Instead, they form a novel class of 3D solids with an unparalleled atomic arrangement, featuring a distribution of lattice constants, which is tunable. A map to identify further material combinations with similar characteristic is given. It opens the way for the design of a novel class of artificial solids with unexplored properties.

机译：提出了一种在弱结合异质结构中实现应变工程的途径。这类异质结构由分层材料组成，这些材料分别具有明显的强键和弱键键层次，并且在它们的构建块内和跨越它们，它们相互之间会解耦。因此，预期它们不适用于与各向同性牢固结合的常规材料所采用的应变工程。在此，首次显示层状硫族化物（Sb2Te3 / GeTe）的超晶格既不表现为完全解耦的二维（2D）材料，也不表现为共价键合的三维（3D）材料。相反，它们形成了无与伦比的原子排列的新颖3D实体类，具有可调整的晶格常数分布。给出了识别具有相似特性的其他材料组合的图。它为设计具有未开发特性的新型人造固体开辟了道路。

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来源
《Advanced Functional Materials》 |2018年第14期|1705901.1-1705901.7|共7页
作者
Wang Ruining; Lange Felix R. L.; Cecchi Stefano; Hanke Michael; Wuttig Matthias; Calarco Raffaella;
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作者单位

Paul Drude Inst Festkorperelekt, Hausvogteipl 5-7, D-10117 Berlin, Germany;

Rhein Westfal TH Aachen, Phys Inst IA 1, D-52074 Aachen, Germany;

Paul Drude Inst Festkorperelekt, Hausvogteipl 5-7, D-10117 Berlin, Germany;

Paul Drude Inst Festkorperelekt, Hausvogteipl 5-7, D-10117 Berlin, Germany;

Rhein Westfal TH Aachen, Phys Inst IA 1, D-52074 Aachen, Germany;

Paul Drude Inst Festkorperelekt, Hausvogteipl 5-7, D-10117 Berlin, Germany;

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正文语种 eng
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molecular beam epitaxy; phase change materials; strain engineering; superlattices; van der Waals epitaxy;

机译：分子束外延;相变材料;应变工程;超晶格;范德华外延;

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2D or Not 2D: Strain Tuning in Weakly Coupled Heterostructures

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