标题： 带电轨道方法在腔量子电动力学及更广泛的领域中的应用 显示英文标题

标题： Dressed-Orbital Approach to Cavity Quantum Electrodynamics and Beyond

摘要： 我们提出了一种耦合物质-光子系统的新型表示方法，该方法允许应用为纯费米子系统开发的许多体方法。 我们通过将原始的耦合光-物质问题重写为更高维的配置空间，然后使用光子修饰轨道作为基函数来展开由此“费米化”的耦合系统。 作为应用，我们提出了一个修饰的时间依赖密度泛函理论方法。 所得的修饰Kohn-Sham方案允许对未知交换-相关势进行直接的非绝热近似，并明确包含相关性。 我们以放置在高-Q光学腔中的简单模型系统为例进行说明，并展示了诸如光子场涨落等难以在标准物质-光子Kohn-Sham中捕捉的可观测量的结果。 最后，我们强调，修饰轨道方法不仅限于腔量子电动力学的范畴，还可以应用于例如范德瓦尔斯问题。 显示英文摘要

摘要： We present a novel representation of coupled matter-photon systems that allows the application of many-body methods developed for purely fermionic systems. We do so by rewriting the original coupled light-matter problem in a higher-dimensional configuration space and then use photon-dressed orbitals as a basis to expand the thus "fermionized" coupled system. As an application we present a dressed time-dependent density-functional theory approach. The resulting dressed Kohn-Sham scheme allows for straightforward non-adiabatic approximations to the unknown exchange-correlation potential that explicitly includes correlations. We illustrate this for simple model systems placed inside a high-Q optical cavity, and show also results for observables such as the photon-field fluctuations that are hard to capture in standard matter-photon Kohn-Sham. We finally highlight that the dressed-orbital approach extends beyond the context of cavity quantum electrodynamics and can be applied to, e.g., van-der-Waals problems.