Dipole Instabilities and MMW Oscillation
We have proposed a new paradigm for the direct generation of self-sustaining millimeter-wave oscillations, based on the piezo- and ferroelectric properties of wurtzite III-nitride materials. In contrast to Gunn diodes which exploit a bulk-like active region, periodic oscillation may be achieved in the proposed structures through the creation, propagation and collection of traveling dipole domains supported by fixed polarization charge and the associated two-dimensional electron gas along the plane of a polar heterojunction. State-of-the-art numerical simulation based on the synchronous full-band ensemble Monte Carlo method is applied to study induced oscillations in a simple triode structure similar to that commonly used for AlGaN/GaN high electron mobility transistors.
