Graphene Acoustic-Electric Latch
Ching-Ping Lee1, Yu-Peng Honge1, Man-Ting Shen1, Chiu-Chun Tang1, D. C. Ling2, Yung-Fu Chen3, C. C. Chi1, JENG-CHUNG CHEN1*
1Department of Physics, National Tsing-Hua University, Hsinchu, Taiwan
2Department of Physics, Tamkang University, Tamsui Dist, Taiwan
3Department of Physics, National Central University, Jhongli, Taiwan
* Presenter:JENG-CHUNG CHEN,
We implement a logic latch by using a graphene acoustic-electric transducer. We operate two pairs of inter-digital transducers (IDTs) to launch surface acoustic waves (SAWs) on LiNbO₃ substrate, and use graphene as channel material to host acoustic-electric current I_ae induced by SAWs. By corporately modifying the amplitude of two SAWs, we can manipulate the propagation direction of I_ae so the sign of I_ae measured can be controlled to be positive or negative. We define the zero crossing I_ae as I^OFF_ae, and then demonstrate I_ae can be switched with a ratio I^ON_ae/I^OFF_ae ~ 10^4 at a rate up to few tens kHz. Our device scheme provides a mean to convert incoming acoustic waves modulated with digitized data sequence onto electric signals with frequency band suitable for audio digital modulation. Our graphene acoustic-electric latch may open a route for the future development of various logic devices based on two-dimensional materials.

Keywords: Graphene, logic latch