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 dimulfide changed from an indirect band to a straight band, which significantly improved fluorescence efficiency. Molybdenum also has an entirely new electronic state known as the energy quantum status. This is the third level of freedom that electrons have after spin 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 the concept of the work was inspired by two-dimensional quantum functional material's "ultra thin" nature. This means that the monoatomic layer material of a single-atom is folded as a paper piece, creating a double which can not be produced through 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 different interlayer symmetry and interlayer pairing. 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 of natural molybdenum diulfide has weak energy valley spin polarization. However, the molybdenum dime "origami", which can break the centralinversion symmetry directly, significantly 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 symmetric symmetrical molybdenum dishulfide" "origami" retains strong spin polarization. This research provides an experimental platform that allows us to study and control the interactions of many degrees of freedom, including valley, spin and interlayer co-coupling. Additionally, it can be used as a basis for creating two-dimensional artificial materials or future quantum devices.
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