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Peking University found that a single layer of molybdenum disulfide Valley’s absorption properties

Nature Communications recently published a Material Science Center of Peking University International Quantum (Von economic researcher and Professor Wang Enge is corresponding author) in cooperation with the Institute of Physics, Chinese Academy of Sciences and the Institute of Semiconductors articles Valley-selective circular dichroism of monolayer molybdenum disulphide. The work in this study for the first time predicted theoretically and confirmed experimentally that a single layer of molybdenum disulfide Valley Select circularly polarized light absorption properties.

Exploration of novel quantum properties of the new materials in modern scientific research is important, it is not only to help people understand the laws of physics, but also fueled the development of high-tech. Symmetry and topology exploration of novel quantum materials of concern in the near future. In this article, Von economic researcher calculated by first-principles, research and analysis of the optical absorption of a single layer of molybdenum disulfide. This work demonstrates that the monolayer of molybdenum disulfide band has a "valley" shaped structure in the vicinity of the vertex of the hexagon Brillouin zone, while the valley of the adjacent vertices are not equivalent, respectively absorb the left-handed light and dextrose light, and the selectivity is almost perfect. This theory has been of Physics, Pedestal researcher study group and Semiconductors Tan Pingheng researcher study group confirmed in experiments.

The study was first discovered the optically selective of the material in the Valley, has an extremely important significance for the new generation of electronics - the development of electronics in the valley. Previously, the biggest challenge of the Valley electronics applications, Valley polarization is not yet implemented in the monolayer atomic film, single layer of molybdenum disulfide Valley selectivity of circularly polarized light absorption characteristics precisely to solve this problem. The material optical Hall effect is a more single-layer molybdenum disulfide the optoelectronics Valley electronics applications to build a bridge.

This research was funded by the National Natural Science Foundation Committee, Ministry of Science and Technology.

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