Employing graphene acoustoelectric switch by dual surface acoustic wave transducers

Abstract

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 ₃ substrate and utilize graphene as a channel material to sustain acoustoelectric current I _ae induced by SAWs. By cooperatively tuning the input power on the IDTs, we can manipulate the propagation direction of I _ae such that the measured I _ae can be deliberately controlled to be positive, negative, or even zero. We define the zero-crossing I _ae as \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${I}_{ae}^{off}$$\end{document} , and then demonstrate that I _ae can be switched with a ratio \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${I}_{ae}^{on}/{I}_{ae}^{off}\, \sim \,{10}^{4}$$\end{document} 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.