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arXiv 2204.04041cond-mat.mes-hall
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原子薄半导体中耗散光-物质耦合诱导的负质量激子极化激元

Negative-mass exciton polaritons induced by dissipative light-matter coupling in an atomically thin semiconductor

M. Wurdack, T. Yun, M. Katzer, A. G. Truscott, A. Knorr, M. Selig, E. A. Ostrovskaya, E. Estrecho

摘要:

色散工程是一种功能强大的多功能工具,可以改变光信号的速度,并在粒子和准粒子动力学中引起负质量效应。在这里,我们表明,在光学微腔中的束缚电子-空穴对(激子)和光子之间的耗散耦合可以导致激子极化激元的形成与反向色散的较低的极化激元分支,因此负质量。我们进行直接测量的原子级薄(单层)WS $_2$晶体嵌入平面微腔的异常色散,并证明负质量极化激元的传播方向是相反的,他们的动量。我们的研究为激子极化激元引入了非厄米色散工程的新概念,并为实现固态量子物质的新相开辟了途径。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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