论文标题
等离激元增益和非转流的定向依赖性在漂移偏置的石墨烯中
Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene
论文作者
论文摘要
在这里，我们使用Galilean和相对论型多普勒多普勒的电导率的转化，研究了漂流偏置石墨烯中表面等离子体中表面等离子体的非转化传播和扩增。与以前的研究一致，两个电导率模型都预测了由于电子引起的阻力效应而导致表面等离子体的非倒数传播。尤其是，伽利略多普勒偏移模型导致等离子分散的光谱不对称，并具有单向传播的状态。值得注意的是，当两个电导率模型都可以在平面方向的宽角度扇区中预测非置换等离子体放大的机制，当时漂移流动偏置的石墨烯表与等离激元基底物（Nome，SIC）耦合，与等离激元扩增的速率相关率较高，用于相关模型。
Here, we investigate the nonreciprocal propagation and amplification of surface plasmons in drift-current biased graphene, using both Galilean and relativistic-type Doppler shift transformations of the graphene's conductivity. Consistent with previous studies, both conductivity models predict strongly nonreciprocal propagation of surface plasmons due to the drag effect caused by the drifting electrons. In particular, the Galilean Doppler shift model leads to stronger spectral asymmetries in the plasmon dispersion with regimes of unidirectional propagation. Remarkably, it is shown that both conductivity models predict regimes of nonreciprocal plasmon amplification in a wide angular sector of in-plane directions when the drift-current biased graphene sheet is coupled to a plasmonic substrate (namely, SiC), with the plasmon amplification rate being substantially higher for the relativistic Doppler shift model.
