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

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 indirect band gaps to direct band gaps, which improved 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.
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 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 investigate the spatial and electronic structure of different 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 the interlayer coupling have a significant impact on the indirect band gap in molybdenum-disulfide 'origami'. They can also act as a switch in the relationship of electron spin to the spine. 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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