For quasiparticle systems, the control of the quasiparticle lifetime is an important goal, determining whether the related fascinating physics can be revealed in fundamental research and utilized in practical applications. Here, we use double-layer graphene with a boron nitride spacer as a model system to demonstrate that the lifetime of coupled Dirac plasmons can be remotely tuned by electric field-controlled damping pathways. Essentially, one of the graphene layers serves as an external damping amplifier whose efficiency can be controlled by the corresponding doping level. Through this damping switch, the damping rate of the plasmon can be actively tuned up to 1.7 fold. This Letter provides a prototype design to actively control the lifetime of graphene plasmons and also broadens our horizon for the damping control of other quasiparticle systems.

中文翻译：

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耦合狄拉克等离子体的电场控制阻尼开关

对于准粒子系统，准粒子寿命的控制是一个重要的目标，决定着相关引人入胜的物理学能否在基础研究中得到揭示并在实际应用中得到利用。在这里，我们使用带有氮化硼间隔层的双层石墨烯作为模型系统来证明耦合狄拉克等离子体激元的寿命可以通过电场控制的阻尼路径进行远程调节。本质上，其中一个石墨烯层用作外部阻尼放大器，其效率可以通过相应的掺杂水平来控制。通过这个阻尼开关，等离子体激元的阻尼率可以主动调谐到 1.7 倍。这封信提供了一个原型设计来主动控制石墨烯等离子体的寿命，并拓宽了我们对其他准粒子系统的阻尼控制的视野。