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. 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 the fluorescence efficiencies and light absorption cross sections. Molybdenum sulfur has a newly discovered electronic state: the energy quantum states. It can be regarded the third internal degree freedom of electrons following charge and spin. 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 Wu Shiwei the concept of this work is founded on the "ultrathin" nature two-dimensional quantum functional material: that monoatomic layer is folded directly as a piece paper, resulting in a double which cannot be produced by natural epitaxial or 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 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 electronic and space structures of various 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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