Nonreciprocal photonic devices play a significant role in regulating the propagation of electromagnetic waves. Here we theoretically investigate the nonreciprocal properties of transverse magnetic modes in a multilayered graphene-dielectric crystal under an applied DC bias. We find that drifting electrons driven by the external DC electric field can give rise to extremely asymmetric dispersion diagrams. Furthermore, when the drifting electrons travel antiparallel to the normal component of the incident wave vector, negative refraction can be strongly suppressed, causing the energy of light to flow along the direction of the electric current. Our theoretical findings can be used to design nonreciprocal optoelectronic devices and enable light to propagate without refraction.

不可逆的光子器件在调节电磁波的传播中起着重要作用。在这里，我们从理论上研究了在施加的直流偏压下多层石墨烯-介电晶体中横向磁模的不可逆特性。我们发现，由外部直流电场驱动的漂移电子会产生极不对称的色散图。此外，当漂移电子反向平行于入射波矢量的法线分量行进时，可以强烈地抑制负折射，从而使光的能量沿电流方向流动。我们的理论发现可用于设计不可逆的光电器件，并使光能够传播而不会发生折射。