The reporter learned from China University of Science and Technology that the CAS Key Laboratory of Quantum Information, under the leadership of Academician Guo Guangcan, has made new progress in nano-electromechanical systems. The laboratory cooperated with the University of California, USA, to study the mode coupling of two graphene nanocrystals In the process, the third resonator was introduced into the cavity as a phonon cavity model successfully, and the non-neighbors mode coupling was successfully achieved. The related research results were published in the recently published "Nature Communication".
Nano resonators have the advantages of small size, good stability and high quality factor, which are excellent carriers for information storage and manipulation. In order to achieve the information transfer between different resonant modes, the controllable coupling between modes needs to be realized first. In recent years, Different research groups have conducted in-depth studies on different resonant modes in the same resonator and the mode coupling mechanism between adjacent resonators, however, there has been no international correlation on how to realize a non-adjacent and tunable resonant mode coupling Reported.
In response to this problem, the research team designed and prepared three series-connected graphene nanocrystals. The resonant frequency of each resonator can be widely adjusted by the metal electrodes at the bottom of each. Therefore, as long as the proper electrode voltage is set The resonant coupling of the three resonators can be achieved.The research group first measured the mode splitting between the two adjacent resonators and proved that the adjacent resonators can reach the strong coupling range in the series structure.This is the first step to explore the first And the third resonator.After the experiment and exploration, the research team found that when the resonant frequency of the intermediate resonator is adjusted to be much higher (or much lower) than the resonant frequencies of the two resonators, two The mode splitting between the two end resonators can not occur, that is, the coupling strength between the two resonators is very small. However, when the resonant frequency of the intermediate resonator gradually approaches the resonant frequency of the two end resonators, mode splitting occurs gradually at both the resonators, Cleft value gradually increased.
This experiment is the first time that a non-nearest neighbor coupling of resonant modes is realized in the nanometer resonator system, which is of great significance to the development of the nanomechanical resonator field and provides the conditions for the future long-distance transmission of information using the phonon mode in the quantum section .
Source: Science and Technology Daily
