In collaboration with the calculation team of Gong Xingao, the research group of Wu Shiwei and Liu Wei of the Department of Physics of Fudan University studied the molybdenum disulfide double-layer material that was completely different from the natural structure through the “origami†method, and realized the structure of molybdenum disulfide band, energy valley, The manipulation of physical properties such as spintronic states. The relevant research results were published online on August 31st in Nature-Nanotechnology.
Molybdenum disulfide is a typical transition metal dichalcogenide. It is one of the most important two-dimensional quantum functional materials in the world in recent years. Molybdenum disulfide has a two-dimensional layered structure similar to single-atom-thick "magic material" graphene and is a layered crystalline mineral. A thorough understanding of its internal mechanisms and the quantum manipulation of physical properties such as energy band structure and energy valley are of great value for condensed matter physics and future new electronics and optoelectronics fields.
According to Wu Shiwei, the research team is based on the "ultra-thin" nature of the two-dimensional quantum functional materials, which directly "folds" single atomic layer materials like a piece of paper to develop a two-layer structure that is completely different from natural structures. They found that the "folding" approach can change the symmetry of the material, and symmetry leads to fundamental changes in physical properties. Depending on the folding direction and the folding line position, molybdenum disulfide "folded paper" has a rich and varied arrangement of layers, which in turn leads to different structural symmetry and coupling between layers. The research team used various experimental techniques and calculation methods to study the spatial and electronic structures of various types of molybdenum disulfide origami.
The results of the study indicate that the natural molybdenum disulfide double layer has a central symmetry, and therefore has only a weak "energy valley-spin polarization" new electronic state. By means of the molybdenum disulfide “folding†approach, the inversion symmetry of the center of the material can be directly broken, and the increase and decrease of inter-layer coupling between atoms can be controlled. At the same time, it is like a “switch†that controls the generation and disappearance of new electronic states. This achievement provides a new thinking for understanding two-dimensional artificial materials and preparing new quantum devices in the future. (Reporter Wang Chun)
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