The current-carrying state of a nanometer Field Effect Transistor(FET) may become unstable against the generation of high-frequency plasma waves and lead to generation of terahertz radiation. In this paper, the influences of magnetic field,quantum effects, electron exchange-correlation, and thermal motion of electrons on the instability of the plasma waves in a nanometer FET are reported. We find that, while the electron exchange-correlation suppresses the radiation power, the magnetic field, the quantum effects, and the thermal motion of electrons can enhance the radiation power. The radiation frequency increases with quantum effects and thermal motion of electrons, but decreases with electron exchange-correlation effect. Interestingly, we find that magnetic field can suppress the quantum effects and the thermal motion of electrons and the radiation frequency changes non-monotonely with the magnetic field. These properties could make the nanometer FET advantageous for realization of practical terahertz oscillations.
Received 04 June 2013Accepted 26 July 2013Published online 13 August 2013
This work was supported by the National Natural Science Foundation of China under Grant Nos. 11274255 and 10975114, by the Natural Science Foundation of Gansu province under Grant No. 2011GS04358, and by the Natural Science Foundation of Northwest Normal University under Grant Nos. NWNU-KJCXGC-03-48, NWNU-LKQN-12-12, and NWNU-LKQN-10-27.
Article outline: I. INTRODUCTION II. MODEL III. DISPERSION RELATION IV. NUMERICAL RESULTS V. CONCLUSION
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