Studying the collective excitations in charge neutral graphene (CNG) has recently attracted a great interest because of unusual mechanisms of the charge carrier dynamics. The latter can play a crucial role for formation of recently observed in twisted bilayer CNG graphene plasmon polaritons (GPPs) associated with the interband transitions between the flat electronic bands. Besides, GPPs in CNG can be a tool providing insights into various quantum phenomena in CNG via optical experiments. However, the properties of interband GPPs in CNG are not known, even in the simplest configurations. Here, we show that magnetically-biased single-layer CNG can support interband GPPs of both transverse magnetic and transverse electric polarizations (particularly, at zero temperature). GPPs exist inside the absorption bands originating from the electronic transitions between Landau levels and are tunable by the magnetic field. We place our study into the context of potential near-field and far-field optical experiments.

由于电荷载流子动力学的不寻常机理，研究电荷中性石墨烯（CNG）中的集体激发引起了人们极大的兴趣。后者对于在最近发现的与扁平电子带之间的带间跃迁相关的扭曲双层CNG石墨烯等离子体激元极化子（GPPs）中形成起至关重要的作用。此外，CNG中的GPP可以成为一种工具，可以通过光学实验深入了解CNG中的各种量子现象。然而，即使在最简单的配置中，CNG中的带间GPP的属性也是未知的。在这里，我们显示了磁偏置的单层CNG可以支持横向磁极化和横向电极化（特别是在零温度下）的带间GPP。GPP存在于源自Landau能级之间的电子跃迁的吸收带之内，并且可以通过磁场进行调谐。我们将研究置于潜在的近场和远场光学实验的背景下。