论文标题
双层石墨烯中启用等离子的谐振Terahertz检测的微观理论
Microscopic theory of plasmon-enabled resonant terahertz detection in bilayer graphene
论文作者
论文摘要
托有二维固态基质的电子气体（例如量子井或二维范德华异质结构）支持血浆波的传播。由于电荷保护和当前对流，血浆波之间的非线性相互作用会产生恒定密度梯度，该密度梯度可以被检测为系统边界处的直流电位信号。这种现象是等离子体波光检测方案的核心，该方案是由Dyakonov和Shur首先引入的，用于具有抛物线分散剂的电子系统，然后扩展到石墨烯中的无质量Dirac费米子。在这项工作中，我们发展了双层石墨烯中等离子体波光检测的理论，该理论具有特殊性，即分散关系在局部和动态地取决于等离子体波的强度。在我们的分析中，我们显示了量子电容的效应是如何因电子色散的局部波动而产生的，从而改变了光反射信号的强度。外部电偏置，例如由顶部和底部的大门诱导，可用于控制量子电容校正的强度，从而控制光响应。
The electron gas hosted in a two-dimensional solid-state matrix, such as a quantum well or a two-dimensional van der Waals heterostructure, supports the propagation of plasma waves. Nonlinear interactions between plasma waves, due to charge conservation and current convection, generate a constant density gradient which can be detected as a dc potential signal at the boundaries of the system. This phenomenon is at the heart of a plasma-wave photodetection scheme which was first introduced by Dyakonov and Shur for electronic systems with a parabolic dispersion and then extended to the massless Dirac fermions in graphene. In this work, we develop the theory of plasma-wave photodetection in bilayer graphene, which has the peculiarity that the dispersion relation depends locally and dynamically on the intensity of the plasma wave. In our analysis, we show how quantum capacitance effects, arising from the local fluctuations of the electronic dispersion, modify the intensity of the photodetection signal. An external electrical bias, e.g. induced by top and bottom gates, can be used to control the strength of the quantum capacitance corrections, and thus the photoresponse.
