Theoretical investigation of the influence of gate length on the hybrid plasma frequencies caused by the presence of homojunctions is performed by means of hydrodynamic simulations. It is shown that when a homojunction approaches the gated channel region boundaries, a qualitative change of the spectrum of plasma excitations both in ungated and gated regions of the channel takes place. These changes can modify significantly the high-frequency regions of spectra of both admittance/impedance and current/voltage noise at the structure terminals.

Keywords: FET/HEMT structures, terahertz radiation, plasma waves, hybrid resonances
PACS: 72.20.Ht, 72.30.+q

UŽTŪROS ILGIO ĮTAKA VIENALYČIŲ SANDŪRŲ SUKELTIEMS PLAZMOS VIRPESIAMS InGaAs FET/HEMT DARINIUOSE
P. Shiktorov, E. Starikov, V. Gružinskis
Fizinių ir technologojos mokslų centro Puslaidininkių fizikos institutas, Vilnius, Lietuva

Hidrodinaminiu modeliavimu teoriškai išnagrinėta užtūros įtaka plazminių virpesių hibridiniam rezonansui FET/HEMT darinių homosandūrose. Skaitmeniniai rezultatai parodė plazminio sužadinimo spektrų kokybinius skirtumus kanalo dalyje po užtūra ir likusiose kanalo dalyse, kai homosandūros artėja prie kanalo po užtūra kraštų. Šie pokyčiai gali stipriai pakeisti darinio admitanso / impedanso ir srovės / įtampos triukšmo spektrų aukšto dažnio sritis.

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