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

The most prominent two-dimensional, quantum functional materials of recent years are transition metal dichalcogenide and other transition metals. The honeycomb structure is similar to graphene. However, the adjacent lattice points can alternately be occupied by different elements and exhibit strong spin-orbit correlation, which gives rise to a number of unique physical properties. As an example, molybdenum dioxide can go from a multilayer structure to a monoatomic one. The energy band structure for molybdenum dimethide evolved from an indirect band gap to an direct band gap. This significantly improved fluorescence efficiency, and light absorption. Molybdenum silfide also has an entirely new electronic state known as the energy quantum status. This is the third level of freedom that electrons have after charge and spin. To further understand the mechanism of these quantum phenomena and their manipulation, it is important to condensed material physics and future optoelectronics.

Professor Wu Shiwei explains that this research is based upon the “ultra thin” nature two-dimensional quantum functional material materials. This means that the monoatomic layer material of a single-atom is folded as a paper piece, creating a double which is impossible to obtain by epitaxial or natural crystallization. Layer structure. The direction and position of fold lines determine the interlayer structure of molybdenum dioxide “origami”. This can lead to interlayer symmetry and coupling. For the study of different molybdenum-disulfide types, researchers used a variety of experimental techniques, including nonlinear second harmonic imagery, fluorescence, spectroscopy and optical depolarization. They also combined these with first principles calculations.

Study results have revealed that the double molybdenum-dosulfide layer with central inversion structure has weak energy valley spin polarization. However, the molybdenum diulfide (“origami”) can direct break the central inversionsymmetry which, in turn, enhances the polarization. A change in interlayer binding can affect not only the indirect band gaps of molybdenum-dioxide “origami,” but it can also act as a switch in the relation between electron spin and spine in “foldingpaper”. The symmetrically symmetrical molybdenum dishulfide” “origami,” also maintains strong spin polarization. This research provides an experimental platform that allows us to study and control the interaction of many degrees of freedom, including valley, spin and interlayer co-operation. Additionally, it can be used as a basis for future two-dimensional artificial material and new quantum devices.

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