论文标题
石墨烯等离子phonon耦合模式在特殊点
Graphene plasmon-phonon coupled modes at the exceptional point
论文作者
论文摘要
石墨烯等离子体的性质受到与声子耦合的极大影响。尽管在近场和远场石墨烯光谱中都经常观察到这种耦合，但耦合强度和模式损耗之间的相互作用及其特殊点物理学之间的相互作用尚未被讨论。通过应用非热框框架，我们将强耦合和弱耦合之间的过渡点确定为特殊点。通过改变耦合强度和通过石墨烯费米水平的栅极调制来观察到对特殊点附近扰动的敏感性。最后，我们还表明，可以通过改变辐射的入射角来观察到从强耦合到弱耦合的过渡。
Properties of graphene plasmons are greatly affected by their coupling to phonons. While such coupling has been routinely observed in both near-field and far-field graphene spectroscopy, the interplay between coupling strength and mode losses, and its exceptional point physics has not been discussed. By applying a non-Hermitian framework, we identify the transition point between strong and weak coupling as the exceptional point. Enhanced sensitivity to perturbations near the exceptional point is observed by varying the coupling strength and through gate modulation of the graphene Fermi level. Finally, we also show that the transition from strong to weak coupling is observable by changing the incident angle of radiation.
