Generation of super high frequencies by graphene on piezoelectric buffer layer upon applied nanosecond electrical pulse

An unforeseen phenomenon occurred when measuring the current–voltage (I–U) characteristics of graphene samples in pulsed regime. The monolayer was grown by chemical vapor deposition and transferred onto 50 nm buffer HfO2 AlO3 layers. Bilayer obtained from epitaxial on SiC 100 SiO2. distance between contacts varied 5 to 25 µm. measurements were performed employing cables Ω impedance transmit pulses a 0–12 GHz bandwidth sampling scope used register them. transmitted registered through graphene/HfO2 graphene/SiO2 superposed with super high frequency (SHF) oscillations. wave packet oscillations about 2 ns duration appeared passed graphene/HfO2. On passed-through pulses, appearing turns into continuous generation along pulse length. Spectral decomposition reveals that base is 10 GHz; however, bisected frequencies are also present spectra. Preliminary analysis SHF occurrence shows packets appear as an inverse piezoelectric response rapidly rising voltage pulses. It proposed due acoustic–electronic interaction, oscillating continued generation, which consumes three-quarters energy. These results show coupling layer combined interaction brings forth novel effects demand for practical applications.