Münster 1997 – scientific programme
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HL: Halbleiterphysik
HL 32: Quantendots II
HL 32.13: Talk
Thursday, March 20, 1997, 18:30–18:45, H2
Terahertz wave amplification, stimulated by dc electric current, in low-dimensional electron systems — •S. Mikhailov1 and N. Savostianova2 — 1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg — 2Moscow State Academy of Instrument Making and Informatics, Stromynka 20, Moscow 107076, Russia
An idea to convert the energy of two-dimensional (2D) plasmons into electromagnetic radiation has being discussed since 1980 [1], but a theory of this effect is absent, and attempts to make solid-state devices based on this principle were so far unsuccessful. We have developed an analytic theory of the amplification of electromagnetic wave passing through a system “2D electron layer - quantum-wire grating coupler”. The transmission coefficient of wave T(ω,jdc) has been calculated as a function of frequency and dc electric current jdc flowing in the 2D layer, and threshold conditions for amplification [T(ω,jdc)>1] have been analysed depending on electron densities, mobilities, and geometrical parameters of the structure. Specific recommendations for designing terahertz wave amplifiers (generators) with a desired frequency are formulated.
[1] D. C. Tsui, E. Gornik, and R. A. Logan, Solid State Commun. 35, 875 (1980); K. Hirakawa, K. Yamanaka, M. Grayson, and D. C. Tsui, Appl. Phys. Lett. 67, 2326 (1995)