双稳定态下碳纳米管电机械系统的电流和机械噪声研究  

Study on Current and Mechanical Noise of Carbon Nanotubes Electromechanical System in Bistable State

作　　者：汪跃 黄多辉[1,2] 段志春[1,2] 邵菊香[1,2] WANG Yue;HUANG Duohui;DUAN Zhichun;SHAO Juxiang(Science Department of Yibin University,Yibin 644000,China;Key Laboratory of Computational Physics in Sichuan Universities of Yibin University,Yibin 644000,China)

机构地区：[1]宜宾学院理学部,四川宜宾644000 [2]宜宾学院计算物理四川省高等学校重点实验室,四川宜宾644000

出　　处：《电声技术》2022年第9期123-125,共3页Audio Engineering

基　　金：宜宾学院计算物理四川省高等学校重点实验室开放基金资助项目(YBUJSWL-ZD-2021-02)。

摘　　要：近来,以碳纳米管谐振子组成的纳米机电体系在纳米机电领域被广泛地研究。对此,从理论层面研究存在强耦合作用的碳纳米谐振子耦合机电体系的量子特征。研究发现,在强烈的耦合作用下,体系的势能呈现出双稳定性。在双稳定状态下,电流存在强烈的电流阻塞。进入双稳定状态后,电流急剧衰减,同时系统的机械噪声在零能处呈现出强烈的峰值,解释为双稳定态电子跃迁所引起的电报噪声。该量子特征能够为体系量子相干性研究以及碳纳米管谐振子高精度测量提供丰富的理论依据。Recently, nano electromechanical systems composed of carbon nanotube resonators have been widely studied in the field of nano electromechanical. In this paper, we theoretically studied the quantum characteristics of the coupling electromechanical system of carbon nano harmonic oscillator in the presence of strong coupling. It was found that under the strong coupling effect, the potential energy of the system presents a bistability. The research found that under the bistability, the current has a strong current blocking, and after entering the bistable state, it decays rapidly. At the same time, the mechanical noise of the system presents a strong peak at zero energy. It is explained as telegraph noise caused by bistable electron transition. The quantum characteristics provide a rich theoretical basis for the study of the quantum coherence of the system and the high-precision measurement of the carbon nanotube harmonic oscillator.

关 键 词：双稳定性 电流 机械噪声 

分 类 号：TN912.2[电子电信—通信与信息系统]