Acousto-electronic transport in silicon

Current Research Topic

Acousto-electronic transport and phonon cavities generated by surface acoustic waves (SAWs) are playing a central role in the rapidly emerging field of quantum acoustics, a phonon analogue of quantum optics on a chip. To enter the quantum regime, both ultrahigh-frequency (UHF) (>10 GHz) SAWs and suitable host materials are indispensable. So far, research in this field has mainly concentrated on GaAs-based substrates. Silicon is attractive for its long spin lifetimes and thus, for the interconnectivity of qubits via SAWs generated by piezoelectric multilayers.


My research will focus on high-frequency acousto-electronic transport in silicon using suitable piezoelectric multilayers. Investigation of available piezoelectric materials using both numerical simulations and validation through fabrication is now in progress. Acousto-electronic transport experiments will follow to investigate the characteristics of said multilayers and their suitability in application in as cavities or interconnects in quantum IT.

Robert Ukropec

Host: University of Twente

Scientific Background

I achieved my Bachelor in Physics at the Comenius University in Bratislava, Slovakia. I continued my higher education at the RWTH University in Aachen, Germany, where I specialized in nanoelectronics. I completed my Master’s degree in Physics in the Semiconductor Nanoelectronics group at the Peter Grünberg Institute, Forschungszentrum Jülich, Germany. During my research, I successfully imaged contacted InAs nanowires using infrared near-field optical microscopy to gain insight into their surface conductance properties with manometer resolution.