Zhernovnykova O A, Popova O V, Deynychenko G V, Deynichenko T I, Bludov Yu V
Department of Mathematics, H.S. Skovoroda Kharkiv National Pedagogical University, Alchevskyh Str., 29, Kharkiv, 61002, Ukraine.
J Phys Condens Matter. 2019 Nov 20;31(46):465301. doi: 10.1088/1361-648X/ab3821. Epub 2019 Aug 2.
The paper deals with the theoretical consideration of surface plasmon-polaritons in the graphene monolayer, embedded into dielectric with spatially separated gain and losses. It is demonstrated, that presence of gain and losses in the system leads to the formation of additional mode of graphene surface plasmon-polaritons, which does not have its counterpart in the conservative system. When the gain and losses are mutually balanced, the position of exceptional point-transition point between unbroken and broken [Formula: see text]-symmetry-can be effectively tuned by graphene's doping. In the case of unbalanced gain and losses the spectrum of surface plasmon-polaritons contains spectral singularity, whose frequency is also adjustable through the electrostatic gating of graphene.
本文探讨了嵌入具有空间分离增益和损耗的电介质中的单层石墨烯中表面等离激元极化子的理论考量。结果表明，系统中增益和损耗的存在会导致形成额外的石墨烯表面等离激元极化子模式，而在保守系统中不存在这种对应模式。当增益和损耗相互平衡时，通过石墨烯的掺杂可以有效地调节异常点（即未破坏和破坏的[公式：见正文]对称性之间的转变点）的位置。在增益和损耗不平衡的情况下，表面等离激元极化子的光谱包含光谱奇点，其频率也可通过石墨烯的静电门控进行调节。
