Semiconductor Institute confirms the circular polarized light absorption properties of single-layer molybdenum disulfide valley
Nature Communications recently published the article Valley-selective circular dichroism of monolayer from Peking University International Center for Quantum Materials Science (Researcher Feng Ji and Professor Wang Enge are corresponding authors) in collaboration with the Institute of Physics and the Institute of Semiconductors of the Chinese Academy of Sciences molybdenum disulphide. This research work is predicted theoretically for the first time, and experimentally confirmed the valley-selective circular polarized light absorption properties of a single layer of molybdenum disulfide.
The exploration of novel quantum properties of new materials is of great significance in modern scientific research. It not only helps people understand the laws of physics, but also contributes to the development of high and new technologies. Symmetry and topology have attracted much attention in the recent exploration of new quantum materials. In this article, researcher Feng Ji and others conducted research and analysis on the light absorption of single-layer molybdenum disulfide through first-principles calculations. This work shows that the energy band of a single layer of molybdenum disulfide has a "valley" structure near the vertices of the hexagonal Brillouin zone, and the valleys of adjacent vertices are not equivalent. Light, its selectivity is almost perfect. This theory has been experimentally confirmed by the research group of Liu Baoli of the Institute of Physics and the research group of Tan Pingheng of the Semiconductor Institute.
This research first discovered the optical selectivity of the valley in the material, which is extremely important for the development of a new generation of electronics-Valley Electronics. Prior to this, the biggest challenge in the application of valley electronics was that valley polarization has not been realized in a single-layer atomic thin film, and the valley-selective circularly polarized light absorption feature of a single layer of molybdenum disulfide just solved this problem. The optical Hall effect of the material further bridges the application of optoelectronics and valley electronics in single-layer molybdenum disulfide.
This research was supported by the National Natural Science Foundation of China and the Ministry of Science and Technology.
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The absorption properties of single layer molybdenum disulfide valley-selected circularly polarized light have been experimentally confirmed
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