The strong-to-weak coupling transition in graphene plasmon-phonon modes is identified as an exceptional point, with enhanced sensitivity to perturbations via Fermi level modulation and incident angle.
Manifestation of PT symmetry breaking in polarization space with terahertz metasurfaces
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Graphene plasmon-phonon coupled modes at the exceptional point
The strong-to-weak coupling transition in graphene plasmon-phonon modes is identified as an exceptional point, with enhanced sensitivity to perturbations via Fermi level modulation and incident angle.