Theoretical Investigation of Current Instabilities and Terahertz Oscillations in a Two-Dimensional Electron Fluid.
Final technical rept. Nov 94-Dec 95,
AKADEMIYA NAUK SSSR LENINGRAD FIZIKO-TEKHNICHESKII INSTITUT
Pagination or Media Count:
The purpose of this work is to develop a physical theory of novel mechanisms for generation and detection of electromagnetic radiation in the terahertz range using the plasma oscillations of the two dimensional electron fluid in a Field Effect Transistor FET. It was shown previously hy M.I.Dyakonov and M.S.Shur that the motion of the electrons in a FET under certain conditions is described by hydrodynamic equations which coincide with those for shallow water, and that the current carrying state is unstable against plasma wave generation in the terahertz frequency range.ln this work we have l Developed a nonlinear theory of plasma oscillations build up as a result of this instability 2 Studied a new mechanism leading to current saturation in a FET, which is similar to the choking effect in conventional hydrodynamics 3 Studied the influence of boundary condition at the source and the drain on the instability threshold, as well as the role of the viscosity of the electron fluid 4 Considered other mechanisms of instability and plasma wave generation in the electron fluid.
- Solid State Physics