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 quantum functional material in the world. These materials have a honeycomb like graphene but have spin-orbit coupling and a honeycomb pattern. As an example, molybdenum isosulfide's energy band structure evolved from a multilayer to monoatomic layer from an indirect band to a directly band, resulting in a significant improvement of the fluorescence efficiency as well as the light absorption. Molybdenum sulfur has a newly discovered electronic state known as the energy quanta state. It can be seen as the electrons' third internal degree freedom after spin and charge. 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 of fold and the position the fold line. This in turn results in different macrostructures symmetry and interlayer couple. The 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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