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

(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 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 band gaps to direct band gaps, resulting in a significant improvement of the light absorption and fluorescence. Molybdenum Sulfide also has a novel electronic state called the energy quantum state. It can be considered 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 Professor Wu Shiwei’s idea, this work is based upon the “ultra thin” nature of the two-dimensional quantum functional material: the monoatomic layers are folded like paper directly, developing a second that cannot be achieved through 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 research team combined first-principles computations with various experimental techniques including fluorescence spectroscopy and optical depolarization to study the spatial electronic structure of various 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 the interlayer coupling have a significant impact on the indirect band gap in molybdenum-disulfide “origami”, and 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.

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.

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