标题： 手性多层石墨烯中由相互作用引起的德鲁德权重和等离子体频率的重整化理论 显示英文标题

标题： Theory of interaction-induced renormalization of Drude weight and plasmon frequency in chiral multilayer graphene

摘要： 我们发展了一种理论，用于掺杂多层石墨烯的光学电导率，包括电子-电子相互作用的影响。 应用量子动力学形式，我们提出了一个伪自旋布洛赫方程组，该方程组描述了在库仑相互作用影响下，由外部\emph{a.c.}电场驱动的非平衡密度矩阵的动力学。 这些方程揭示了一种动态机制，将来自多层石墨烯系统中伪自旋纹理的手性引起的德鲁德响应和带间响应耦合起来。 我们证明，这导致了由相互作用引起的德鲁德权重和等离子体频率的增强，这种增强强烈依赖于伪自旋的绕数。 以双层石墨烯为例，我们还研究了高能带的影响，并发现它们贡献了在低能两带描述中未被捕捉到的显著重整化效应。 我们认为，这种德鲁德权重和等离子体频率的增强通常出现在具有电子手性的材料中。 显示英文摘要

摘要： We develop a theory for the optical conductivity of doped multilayer graphene including the effects of electron-electron interactions. Applying the quantum kinetic formalism, we formulate a set of pseudospin Bloch equations that governs the dynamics of the nonequilibrium density matrix driven by an external \emph{a.c.} electric field under the influence of Coulomb interactions. These equations reveal a dynamical mechanism that couples the Drude and interband responses arising from the chirality of pseudospin textures in multilayer graphene systems. We demonstrate that this results in an interaction-induced enhancement of the Drude weight and plasmon frequency strongly dependent on the pseudospin winding number. Using bilayer graphene as an example, we also study the influence of higher-energy bands and find that they contribute considerable renormalization effects not captured by a low-energy two-band description. We argue that this enhancement of Drude weight and plasmon frequency occurs generally in materials characterized by electronic chirality.