论文标题
双层石墨烯棘轮中的回旋子和磁性弹药共振
Cyclotron- and magnetoplasmon resonances in bilayer graphene ratchets
论文作者
论文摘要
我们在空间调制的双层石墨烯中报告了Terahertz辐射到DC电流的可调 - 通过磁场和栅极电压的可调节。我们通过实验表明，潜在的物理与所谓的棘轮效应有关。我们的主要发现是直接观察光电流中尖锐的回旋共振，以及由电子 - 电子相互作用引起的两种效应的证明：远距离库仑耦合引起的共振的等离激元分裂，以及由于快速粒子碰撞而引起的第二次谐波。我们开发了一种非常适合我们数据的理论。我们认为，棘轮电流是在非理想电子液体的流体动力学方面产生的。
We report on a tunable - by magnetic field and gate voltage - conversion of terahertz radiation into a dc current in spatially modulated bilayer graphene. We experimentally demonstrate that the underlying physics is related to the so-called ratchet effect. Our key findings are the direct observation of a sharp cyclotron resonance in the photocurrent and the demonstration of two effects caused by electron-electron interaction: the plasmonic splitting of the resonance due to long-range Coulomb coupling and the partial suppression of its second harmonic due to fast interparticle collisions. We develop a theory which perfectly fits our data. We argue that the ratchet current is generated in the hydrodynamic regime of non-ideal electron liquid.
