Current-driven plasma instabilities for a bilayer two-dimensional electron system

Antonios Balassis; Godfrey Gumbs; Danhong Huang

doi:10.1117/12.825158

9 September 2009 Current-driven plasma instabilities for a bilayer two-dimensional electron system

Antonios Balassis, Godfrey Gumbs, Danhong Huang

Proceedings Volume 7467, Nanophotonics and Macrophotonics for Space Environments III; 74670O (2009) https://doi.org/10.1117/12.825158
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

We have formulated a theory to help us investigate the conditions which are needed to achieve stronger plasmon instability leading to emission in the terahertz (THz) regime for semiconductor quantum wells (QWs). The surface response function is calculated for a bilayer two-dimensional electron gas (2DEG) system in the presence of a metal grating placed on the surface which modulates the electron density. The 2DEG layers are coupled to surface plasmons arising from excitations of free carriers in the bulk region between the layers. A current is passed through one of the 2DEG layers and is characterized by a drift velocity υ_D. With the use of the surface response function, the plasmon dispersion equation is obtained as a function of frequency ω, the in-plane wave vector q_ll = (q_x, q_y) and reciprocal lattice vector nG where n = 0,±1,±2, ... with G = 2π/d and d denoting the period of the grating. The dispersion equation, which yields the resonant frequencies, is solved in the complex ω-plane for real wave vector q_ll. It is ascertained that the imaginary part of ω is enhanced with decreasing d, and with increasing the doping density of the free carriers in the bulk medium for fixed grating period.

Citation Download Citation

Antonios Balassis, Godfrey Gumbs, and Danhong Huang "Current-driven plasma instabilities for a bilayer two-dimensional electron system", Proc. SPIE 7467, Nanophotonics and Macrophotonics for Space Environments III, 74670O (9 September 2009); https://doi.org/10.1117/12.825158

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