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 indirect to direct band gaps, improving the fluorescence efficiency as well as the light absorption. Molybdenum Sulfide also has a novel electronic state called the energy quantum state. It can be considered as the third degree of freedom for electrons, after charge and spinning. 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.
Professor Wu Shiwei says that this idea is based on "ultra-thinness" of two-dimensional quantum-functional materials. The monoatomic layer is folded straight like a paper and a double is created that can't be produced by epitaxial or natural crystallization. Layer structure. Molybdenum Disulfide “origami” has many interlayer arrangements depending on the direction and location of the fold line. This in turn results in different macrostructures symmetry and interlayer pairing. The team combined first-principles computations with various experimental techniques including fluorescence spectroscopy and optical depolarization to investigate the spatial and electronic structure of various types molybdenum dsulfide 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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