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Nano Electronics and Photonics Seminar - "Dipole Instabilities in AlGaN/GaN Heterostructures and the Direct Generation of Millimeter-Wave Oscillations"

Event Type
1000 MNTL
Oct 12, 2012   12:00 pm  
Prof. P. Doug Yoder, School of ECE, Georgia Tech
Originating Calendar
MNTL Calendar

Negative differential drift velocity in wurtzite GaN has been verified experimentally, yet in spite of the wealth of documented theoretical investigations of GaN-based Gunn diodes, not a single such device has yet been demonstrated.  The likelihood of realizing GaN-based k-space transfer devices is reassessed in light of recent theoretical modeling.  A new physical mechanism is proposed for the generation of dipole instabilities in wurtzite III-nitride materials, entirely unrelated to the Gunn effect.  State-of-the art numerical simulation demonstrates the direct generation of millimeter-wave signals exploiting traveling dipole domains in the plane of a polar heterojunction upon which a simple triode structure is superimposed.

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