Sci-Tech

Chinese scientists have prepared controllable chiral graphene coils

2025-02-26   

Recently, Chinese scientists have developed a new technology called "paraffin assisted immersion method", which successfully "rolls up" two-dimensional materials and prepares graphene rolls with controllable chirality, laying a solid foundation for the development of quantum computing and spintronics devices in the future. The research achievement led by Professor Hu Wenping, Lei Shengbin, Li Qifeng, and Associate Professor Shen Yongtao from Tianjin University was recently published in the internationally authoritative journal Nature Materials. Chirality refers to the characteristic that an object and its mirror image cannot completely overlap, just like how a person's left and right hands are mirror images of each other but cannot completely overlap. In the field of materials science, the development of chiral materials is of great significance for advancing cutting-edge technologies such as optical devices, spintronics, and quantum computing. Graphene, as a classic two-dimensional material, has high electrical conductivity, mechanical strength, and chemical stability, but graphene itself is chiral. Scientists are attempting to introduce chirality into graphene and other two-dimensional materials through methods such as curling, in order to explore their potential new properties and applications. At present, chiral two-dimensional materials that can achieve spintronics functionality are very limited and lack universal preparation methods. A research team from Tianjin University has developed a new technology called "Paraffin Assisted Immersion Method" to address this challenge, which can curl graphene at a controllable angle to prepare graphene rolls with specific chirality. The experimental results indicate that the prepared left-handed and right-handed graphene coils exhibit significant optical activity and excellent spin selectivity effects. By precisely controlling the chiral angle, researchers have also achieved spin selective control induced by chirality, which gives graphene coils unique application potential in the field of spintronics. In addition, the research team also found that electrons mainly move along one side of the graphene coil, resulting in preferential spin polarization. This chiral induced spin selectivity effect provides new possibilities for developing efficient spin filters and spin electronic devices. This research achievement not only provides a universal method for chiral regulation of non chiral two-dimensional materials, but also opens up new directions for exploring quantum behavior and developing room temperature spin electron technology Lei Shengbin introduced that in the future, this technology is expected to achieve unique functions beyond traditional carbon materials in fields such as spintronics, quantum computing, optical devices, and materials science, injecting new vitality into the development of spintronics and quantum technology. (New Society)

Edit:He Chuanning Responsible editor:Su Suiyue

Source:Xinhua

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