Employing graphene acoustoelectric switch by dual surface acoustic wave transducers

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 I_ae^off , and then demonstrate that I ae can be switched with a ratio I_ae^on/I_ae^off ∼ 10^4 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.