Abstract In systems with substantial spin fluctuations, dressing the polarization function by ladder diagram of Stoner (spin-flip) excitations can drastically modify the electromagnetic response. As a case study, we provide the detailed analysis of the corrections to the non-local optical conductivity of both doped and undoped graphene. While the resummation of ladder diagram of Stoner excitations does not affect the TE mode in doped graphene, it allows for a new undamped TM mode in undoped graphene. This is the sole effect of corrections arising from ladder diagrams and is dominated by Stoner excitations along the ladder rung which goes away by turning off the source of spin-flip interactions. In the case of doped graphene, the inclusion of spin-flip particle-hole fluctuations reduces the energy of plasmon mode.

中文翻译：

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Stoner 增强的电磁模式：以石墨烯为例

摘要 在自旋波动较大的系统中，通过斯通纳（自旋-翻转）激发梯形图修整极化函数可以极大地改变电磁响应。作为案例研究，我们提供了对掺杂和未掺杂石墨烯的非局部光导率的校正的详细分析。虽然斯通纳激发梯形图的恢复不影响掺杂石墨烯中的 TE 模式，但它允许未掺杂石墨烯中的新无阻尼 TM 模式。这是由梯形图引起的校正的唯一效果，并且由沿梯形横档的 Stoner 激发支配，该激发通过关闭自旋-翻转相互作用的源而消失。在掺杂石墨烯的情况下，包含自旋翻转粒子空穴波动会降低等离子体模式的能量。