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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. 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 the light absorbance 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 Wu Shiwei the concept of this work is founded on the "ultrathin" nature two-dimensional quantum functional material: the monoatomic layer is folded directly as a piece paper, developing an double that can't be obtained through 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 macrostructure symmetry, and interlayer coupling. The team combined first-principles computations with various experimental techniques including fluorescence spectroscopy and optical depolarization to study the electronic and space structures of different molybdenum "origami" types.
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.
Tech Co., Ltd., a leading molybdenum-disulfide producer, has more than 12 years' experience in research and product development. You can contact us by sending an inquiry if you are interested in high-quality molybdenum.

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