论文标题
由电子气体介导的有吸引力和排斥激烈的激子 - 果龙相互作用
Attractive and repulsive exciton-polariton interactions mediated by an electron gas
论文作者
论文摘要
在固态设置中实现强烈的光子 - 光子相互作用是一个主要目标，具有光电应用的潜力很大。使用Landau的准粒子框架结合了微观多体理论，我们在二维半导体中探索了激子 - 果龙与Trions之间的相互作用，并注入了微博内的电子气体。我们表明，电子气体中的粒子孔激发介导极化子之间的有吸引力的相互作用，而通过电子的交换介导的Trion-Polariton相互作用，取决于特定的极性分支。这些介导的相互作用是准粒子的固有的，并且在没有光的情况下也存在。重要的是，在没有电子气体的情况下，它们可以调节比直接极化 - 帕利顿相互作用强的数量级，从而为非线性光学组件提供了有希望的前景。最后，我们将理论预测与最近的两个实验进行了比较。
Realising strong photon-photon interactions in a solid-state setting is a major goal with far reaching potential for optoelectronic applications. Using Landau's quasiparticle framework combined with a microscopic many-body theory, we explore the interactions between exciton-polaritons and trions in a two-dimensional semiconductor injected with an electron gas inside a microcavity. We show that particle-hole excitations in the electron gas mediate an attractive interaction between the polaritons, whereas a trion-polariton interaction mediated by the exchange of an electron is either repulsive or attractive depending on the specific polariton branch. These mediated interactions are intrinsic to the quasiparticles and are also present in the absence of light. Importantly, they can be tuned to be more than an order of magnitude stronger than the direct polariton-polariton interaction in the absence of the electron gas, thereby providing a promising outlook for non-linear optical components. Finally, we compare our theoretical predictions with two recent experiments.
