Acoustic Phonon Dispersion (IMAGE) University of California - Riverside Caption Fariborz Kargar, a graduate student researcher, is measuring the acoustic phonon dispersion in the semiconductor nanowires in UCR's Phonon Optimized Engineered Materials (POEM) Center, directed by Alexander Balandin. Credit UC Riverside Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.