Field-domain dynamics in negative-effective-mass terahertz oscillators

J. Cao () and H. Liu

The European Physical Journal B: Condensed Matter and Complex Systems, 2003, vol. 36, issue 3, 313-316

Abstract: We have theoretically studied electric-field-domain dynamics and current self-oscillations in dc-biased negative-effective-mass (NEM) p + pp + diodes. The formation and traveling of electric-field domains in the diodes are investigated in detail with a realistic treatment of the scatterings contributions from carrier-impurity, carrier-acoustic phonon, and carrier-optic phonon within the balance-equation theory. The interesting patterns of the spatiotemporal electric-field domains are shown as a gray density plot with the applied bias as a controlling parameter. It is found that, the applied bias could largely influence the current patterns and self-oscillating frequencies, which lie in the THz range for the NEM p + pp + diode with a submicrometer p-base. The NEM p + pp + diode may therefore be developed as an electrically tunable THz-frequency oscillator. Copyright Springer-Verlag Berlin/Heidelberg 2003

Date: 2003
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DOI: 10.1140/epjb/e2003-00349-2

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