论文标题
在原子上薄的半导体中诱导的负质量激子极化子。
Negative-mass exciton polaritons induced by dissipative light-matter coupling in an atomically thin semiconductor
论文作者
论文摘要
分散工程是一种功能强大且通用的工具，可以改变光信号的速度并在颗粒和准粒子的动力学中诱导负质量效应。在这里，我们表明，光学微腔中结合的电子孔对（激子）和光子之间的耗散耦合会导致形成具有下极化分支的倒置分散体的激子极性子的形成，从而形成负质量。我们对原子薄（单层）WS $ _2 $晶体进行直接测量，这些分散体嵌入了平面微腔中，并证明负质量极化子的传播方向与其动量相反。我们的研究介绍了一个针对激子北极星的非铁分散工程的新概念，并为在固态中实现量子物质的新阶段打开了途径。
Dispersion engineering is a powerful and versatile tool that can vary the speed of light signals and induce negative-mass effects in the dynamics of particles and quasiparticles. Here, we show that dissipative coupling between bound electron-hole pairs (excitons) and photons in an optical microcavity can lead to the formation of exciton polaritons with an inverted dispersion of the lower polariton branch and hence a negative mass. We perform direct measurements of the anomalous dispersion in atomically thin (monolayer) WS$_2$ crystals embedded in planar microcavities and demonstrate that the propagation direction of the negative-mass polaritons is opposite to their momentum. Our study introduces a new concept of non-Hermitian dispersion engineering for exciton polaritons and opens a pathway for realising new phases of quantum matter in a solid state.
