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Heterostrain
The term heterostrain was proposed in 2018 in the context of materials science to simplify the designation of possible strain situations in van der Waals heterostructures where two (or more) two-dimensional materials are stacked on top of each other. These layers can experience the same deformation (homostrain) or different deformations (heterostrain). In addition to twist, heterostrain can have important consequences on the electronic and optical properties of the resulting structure. As such, the control of heterostrain is emerging as a sub-field of straintronics in which the properties of 2D materials are controlled by strain. Etymology Heterostrain is constructed from the Greek prefix hetero- (different) and the noun strain. It means that the two layers constituting the structure are subject to different strains. This is in contrast with homostrain in which the two layers as subject to the same strain. Heterostrain is designated as "relative strain" by some authors. Mani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
:en:Twistronics
Twistronics (from ''twist'' and ''electronics'') is the study of how the angle (the twist) between layers of two-dimensional materials can change their electrical properties. Materials such as bilayer graphene have been shown to have vastly different electronic behavior, ranging from non-conductive to superconductive, that depends sensitively on the angle between the layers. The term was first introduced by the research group of Efthimios Kaxiras at Harvard University in their theoretical treatment of graphene superlattices. History In 2007, National University of Singapore physicist Antonio Castro Neto hypothesized that pressing two misaligned graphene sheets together might yield new electrical properties, and separately proposed that graphene might offer a route to superconductivity, but he did not combine the two ideas. In 2010 researchers from Universidad Técnica Federico Santa María in Chile found that for a certain angle close to 1 degree the band of the electronic str ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
:en:Straintronics
Straintronics (from ''strain'' and ''electronics'') is the study of how folds and mechanically induced stresses in a layer of two-dimensional materials can change their electrical properties. It is distinct from twistronics in that the latter involves changes in the angle between two layers of 2D material. However, in such multi-layers if strain is applied to only one layers, which is called heterostrain, strain can have similar effect as twist in changing electronic properties.{{Cite journal , last1=Mesple , first1=Florie , last2=Missaoui , first2=Ahmed , last3=Cea , first3=Tommaso , last4=Huder , first4=Loic , last5=Guinea , first5=Francisco , last6=Trambly de Laissardière , first6=Guy , last7=Chapelier , first7=Claude , last8=Renard , first8=Vincent T. , date=2021-09-17 , title=Heterostrain Determines Flat Bands in Magic-Angle Twisted Graphene Layers , url=https://link.aps.org/doi/10.1103/PhysRevLett.127.126405 , journal=Physical Review Letters , volume=127 , issue=12 , pages=1264 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
:en:Materials Science
Materials science is an Interdisciplinarity, interdisciplinary field of researching and discovering materials. Materials engineering is an engineering field of designing and improving materials, and finding uses for materials in other fields and industries. The intellectual origins of materials science stem from the Age of Enlightenment, when researchers began to use analytical thinking from chemistry, physics, and engineering to understand ancient, Empirical relationship, phenomenological observations in metallurgy and mineralogy. Materials science still incorporates elements of physics, chemistry, and engineering. As such, the field was long considered by academic institutions as a sub-field of these related fields. Beginning in the 1940s, materials science began to be more widely recognized as a specific and distinct field of science and engineering, and major technical universities around the world created dedicated schools for its study. Materials scientists emphasize unde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
