Generation of coherent gigahertz acoustic phonons in AlGaN/GaN microwave field-effect transistors

Song, Jung-Hoon; Zhang, Qiang; Patterson, W.; Nurmikko, A. V.; Uren, M. J.; Hilton, K. P.; Balmer, R. S.; Martin, T.
August 2003
Applied Physics Letters;8/4/2003, Vol. 83 Issue 5, p1023
Academic Journal
We apply an optical probing technique on AlGaN/GaN field-effect transistors to demonstrate that coherent gigahertz phonons are generated copiously under large signal operation. The phonon generation originates from time varying electron screening of the piezoelectric polarization fields in the active region, and may provide a nondiffusive means of energy dissipation for high power devices.


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