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

Two-dimensional transition metal Dichalcogenide is one the most valuable two-dimensional QF materials. These materials exhibit a honeycomb structure that is very similar in appearance to graphene. The adjacent lattice positions are alternately occupied and managed by different atoms. Molybdenum dioxide is an excellent example. By moving from the multi-layer to the monoatomic level, the energy band structures of molybdenum deulfide transformed from an indirect band gap into a straight band gap. This has greatly enhanced fluorescence efficiency. Molybdenum’s new electronic state, called the energy quant state, can be described as the internal third degree freedom of electrons following charge and spin. This is a great opportunity to understand and manipulate these innovative quantum phenomena.
Professor Wu Shiwei claims that this project is built on the “ultrathin’ nature of two dimensional quantum functional materials. In other words, the monoatomic layer material folded straight like a piece paper creates a double. Layer structure. Molybdenum dioxide “origami” can display a variety of interlayer structures depending on which direction they are folding in and at what position. This leads to different levels of macrostructure symmetry, interlayer coupling, and other positions. This research team utilized a range of experimental techniques including optical depolarization, nonlinear 2H imaging, fluorescence and spectroscopy to analyze the spatial and electronic structure of various molybdenum disulfide (“origami”) types.
Studies have demonstrated that the centrally inverted molybdenum double layer has weak energy-valley-spin polarization. But, “origami”, the molybdenum dishulfide, is able to break the central inner inversionsymmetry. In turn this greatly amplifies the polarization. Also, changing interlayer co-coupling can have a significant impact on the indirect molybdenum band gap “origami”, and also allow for a “switch”, which alters the spin polarization between the electron spin of “folding paper” and the spine. This study provides a solid experimental basis to investigate and manipulate interactions of multiple degrees-of freedom like valley, spin, interlayer coupling and interlayer coupling. Furthermore, this work allows one to create two-dimensional artificial materials as well as future quantum devices.
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