The Coulomb drag is a many-body effect observed in proximized low-dimensional systems. It appears as emergence of voltage in one of them upon passage of bias current in another. The magnitude of drag voltage can be strongly affected by exchange of plasmonic excitations between the layers; however, the reverse effect of Coulomb drag on properties of plasmons has not been studied. Here, we study the plasmon spectra and damping in parallel two-dimensional systems in the presence of Coulomb drag. We find that Coulomb drag leads to selective damping of one of the two fundamental plasma modes of a coupled bilayer. For identical electron doping of both layers, the drag suppresses the acoustic plasma mode; while for symmetric electron-hole doping of the coupled pair, the drag suppresses the optical plasma mode. The selective damping can be observed both for propagating modes in extended bilayers and for localized plasmons in bilayers confined by source and drain contacts. The discussed effect may provide access to the strength of Coulomb interaction in 2d electron systems from various optical and microwave scattering experimnets.

库仑阻力是在近似低维系统中观察到的多体效应。它表现为当偏置电流在另一个中通过时在其中一个中出现电压。拖曳电压的大小会受到层间等离激元激发交换的强烈影响；然而，库仑阻力对等离子激元特性的反向影响尚未研究。在这里，我们研究了存在库仑阻力的平行二维系统中的等离激元光谱和阻尼。我们发现库仑阻力导致耦合双层的两种基本等离子体模式之一的选择性阻尼。对于两层相同的电子掺杂，阻力抑制声等离子体模式；而对于耦合对的对称电子空穴掺杂，阻力会抑制光学等离子体模式。对于扩展双层中的传播模式和由源极和漏极接触限制的双层中的局部等离子体激元，都可以观察到选择性阻尼。所讨论的效应可以通过各种光学和微波散射实验来了解二维电子系统中库仑相互作用的强度。