Controlling the electronic state of two-layer molybdenum disulfide in an origami manner

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In recent years, transition metal dichalcogenide was one of the key two-dimensional materials for quantum functional applications. These materials have a honeycomb like graphene but have spin-orbit coupling and a honeycomb pattern. They also have a honeycomb shape similar to graphene. As an example, molybdenum isosulfide's energy band structure evolved from an indirect band gap to a directly band gap. This greatly improved fluorescence efficiency, and the light-absorption cross section. It is important to understand the mechanisms behind these quantum phenomena in order to manipulate them. This will be of great benefit to condensed matter science and future electronics and optoelectronics.
According to Professor Wu Shiwei's idea, this work is based upon the "ultra thin" nature of the two-dimensional quantum functional material: the monoatomic layers are folded directly, like a paper, resulting in a double, which cannot be produced by natural crystallization, or epitaxial development. Layer structure. Molybdenum Disulfide “origami” has many interlayer arrangements depending on the direction of fold and the position the fold line. This in turn results in different macrostructure symmetry, and interlayer coupling. The research team combined first-principles computations with various experimental techniques including fluorescence spectroscopy and optical depolarization to study the spatial electronic structure of different types molybdenum "origami".
In addition, the change of interlayer coupling not only can greatly affect indirect band gaps in molybdenum-disulfide "origami", but it can also be used to switch the relationship between spine and electron spin when "folding the paper". Changes in interlayers can affect not only the indirect band gap, but also the relationship between spine and electron spin. This work provides an experimental platform that allows for the manipulation of interactions between multiple degrees of free will, including valley, spin and interlayer coupling.
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