The reporter learned from the China University of Science and Technology that the Key Laboratory of Quantum Information of the Chinese Academy of Sciences, led by Academician Guo Guangcan, has made progress in the development of nano-electromechanical systems (NEMS). The laboratory collaborated with the University of California in the United States to innovatively introduce a third resonator as a phonon cavity mode in the study of the mode coupling of two graphene nanoresonators, successfully implementing mode coupling of non-near neighbors. The relevant research results were published in the recently published Nature News.

Nano-resonators have the advantages of small size, good stability, high quality factor, and are excellent carriers for information storage and manipulation. In order to realize the information transmission between different resonant modes, it is necessary to realize the controllable coupling between the modes. In recent years, different international research groups have conducted in-depth studies on the different resonant modes in the same resonator and the mode coupling mechanism between neighbor resonators. However, there is no international report on how to achieve non-neighbor and adjustable resonant mode coupling.

In response to this problem, the research team designed and prepared three serially connected graphene nanoresonators. The resonant frequency of each resonator can be adjusted over a wide range of metal electrodes at the bottom of the resonator. Therefore, only a suitable electrode voltage should be set. Resonant coupling of three resonators can be achieved. The research team first measured the mode split between two adjacent resonators, and proved that the neighbor resonators can reach the strong coupling region in this series structure. This further explores the coupling between the first and third resonators. Created conditions. After experimental exploration, the research team found that when the resonant frequency of the intermediate resonator is adjusted to be much higher (or far lower) than the resonant frequency of both resonators, mode splitting cannot occur between the two resonators. The coupling strength is very small; however, when the resonant frequency of the intermediate resonator gradually approaches the resonant frequency of both ends of the resonator, the two ends of the resonator gradually generate mode splitting, and the split value gradually increases.

This experiment is the first non-near-neighbor coupling to realize the resonant mode in the nanoresonator system, which is of great impetus to the development of the field of nanoelectromechanical resonators and creates the conditions for future long-range information transmission using the phonon mode in the quantum interval. . (Reporter Wu Changfeng)

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