Original Publication Date
Applied Physics Letters
DOI of Original Publication
Date of Submission
We have experimentally proven the Cerenkov generation of optical phonons by drifting electrons in a semiconductor. We observe an instability of the polar optical phonons in nanoscale semiconductors that occurs when electrons are accelerated to very high velocities by intense electric fields. The instability is observed when the electron drift velocity is larger than the phase velocity of optical phonons and rather resembles a “sonic boom” for optical phonons. The effect is demonstrated in p–i–nsemiconductor nanostructures by using subpicosecond Raman spectroscopy.
Liang, W., Tsen, K.T., Sankey, O.F., et al. Observation of optical phonon instability induced by drifting electrons in semiconductor nanostructures. Applied Physics Letters, 82, 1968 (2003). Copyright © 2003 AIP Publishing LLC.
Is Part Of
VCU Electrical and Computer Engineering Publications