Enhanced response of current-driven coupled quantum wells

被引：0

作者：

Balassis, Antonios ^{[1
]}

Gumbs, Godfrey ^{[2
]}

机构：

[1] Department of Physics, Fordham University, 441 East Fordham Road, Bronx, NY 10458, United States

[2] Department of Physics and Astronomy, Hunter College of the City, University of New York, 695 Park Avenue, New York, NY 10065, United States

来源：

Journal of Applied Physics | 2009年 / 106卷 / 10期

关键词：

We have investigated the conditions necessary to achieve stronger Cherenkov-like instability of plasma waves leading to emission in the terahertz regime for semiconductor quantum wells. The surface response function is calculated for a bilayer two-dimensional electron gas (2DEG) system in the presence of a periodic spatial modulation of the equilibrium 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 layers and is characterized by a drift velocity vD for the driven electric charge. By means of a surface response function formalism; the plasmon dispersion equation is obtained as a function of frequency ω; in-plane wave vector q = (qx; qy); and reciprocal lattice vector nG; where n = 0; ±1; ±2; and G=2 /d; with d denoting the period of the density modulation. The dispersion equation; which yields the resonant frequencies; is solved numerically in the complex ω -plane for the real wave vector q. It is ascertained that the imaginary part of ω is enhanced with decreasing d and with increasing doping density of the free carriers in the bulk medium for a fixed period of the spatial modulation. © 2009 American Institute of Physics;

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