Lee Ching-Ping, Hong Yu-Peng, Shen Man-Ting, Tang Chiu-Chun, Ling D C, Chen Yung-Fu, Wu Cen-Shawn, Chen Jeng-Chung
Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan.
Department of Physics, Tamkang University, Tamsui Dist., New Taipei City, 25137, Taipei, Taiwan.
Sci Rep. 2019 Jun 3;9(1):8235. doi: 10.1038/s41598-019-44689-z.
We implement a logic switch by using a graphene acoustoelectric transducer at room temperature. We operate two pairs of inter-digital transducers (IDTs) to launch surface acoustic waves (SAWs) on a LiNbO substrate and utilize graphene as a channel material to sustain acoustoelectric current I induced by SAWs. By cooperatively tuning the input power on the IDTs, we can manipulate the propagation direction of I such that the measured I can be deliberately controlled to be positive, negative, or even zero. We define the zero-crossing I as [Formula: see text], and then demonstrate that I can be switched with a ratio [Formula: see text] at a rate up to few tens kHz. Our device with an accessible operation scheme provides a means to convert incoming acoustic waves modulated by digitized data sequence onto electric signals with frequency band suitable for digital audio modulation. Consequently, it could potentially open a route for developing graphene-based logic devices in large-scale integration electronics.
我们在室温下使用石墨烯声电换能器实现了一个逻辑开关。我们操作两对叉指换能器（IDT）在铌酸锂衬底上激发表面声波（SAW），并利用石墨烯作为沟道材料来维持由SAW感应产生的声电流I。通过协同调节IDT上的输入功率，我们可以操纵I的传播方向，从而可以有意地将测量到的I控制为正、负甚至零。我们将零交叉I定义为[公式：见原文]，然后证明I可以以高达几十千赫兹的速率以[公式：见原文]的比率进行切换。我们的器件具有易于操作的方案，提供了一种将由数字化数据序列调制的入射声波转换为具有适合数字音频调制频带的电信号的方法。因此，它有可能为大规模集成电子学中基于石墨烯的逻辑器件的开发开辟一条道路。
