We present a description of the energy loss of a charged particle moving parallel to a graphene layer and graphene double layers. Specifically, we compare the stopping power of the plasma oscillations for these two configurations in the absence as well as the presence of circularly polarized light whose frequency and intensity can be varied to yield an energy gap of several hundred $\texttt{meV}$ between the valence and conduction bands. The dressed states of the Dirac electrons by the photons yield collective plasma excitations whose characteristics are qualitatively and quantitatively different from those produced by Dirac fermions in gapless graphene, due in part to the finite effective mass of the dressed electrons. For example, the range of wave numbers for undamped self-sustaining plasmons is increased as the gap is increased, thereby increasing the stopping power of graphene for some range of charged particle velocity when graphene is radiated by circularly polarized light.
Spin current and magnetization induced by circularly polarized synchrotron radiation in magnetically-doped topological insulator Bi$_{1.37}$V$_{0.03}$Sb$_{0.6}$Te$_2$Se
提出了磁掺杂拓扑绝缘体Bi $_{1.37}$ V $_{0.03}$ Sb $_{0.6}$ Te $_2$ Se中利用圆极化同步辐射产生自旋极化电流和相应的诱导磁化的空穴诱导机制.考虑自旋极化电流的产生是由于自旋相关的狄拉克锥拓扑表面态在费米能级和随后的补偿所产生的空穴的人口减少。我们从实验和理论上找到了产生的自旋极化电流与电化学电势移动之间的关系。从实验和理论上证实了圆偏振同步辐射诱导的面外磁化和通过改变圆偏振方向引起的面外磁化反转。
Planar chiral nanoantenna for excitation-chirality-controlled hot spot modulation and emitter-coupled circularly polarized emission
Friedrich Schiller University Jena（耶拿弗里德里希·席勒大学）；Abbe Center of Photonics, Friedrich Schiller University Jena（耶拿弗里德里希·席勒大学阿贝光学中心）；Leibniz Institute of Photonic Technology（莱布尼茨光子技术研究所）；University of Würzburg（维尔茨堡大学）；The Australian National University（澳大利亚国立大学）；Academia Sinica（中央研究院）；National Yang Ming Chiao Tung University（国立阳明交通大学）
