极化子
激子
物理
光子
激子极化
扩散
超短脉冲
联轴节(管道)
弹道传导
混合(物理)
凝聚态物理
分子物理学
材料科学
光学
量子力学
激光器
电子
冶金
作者
M. Balasubrahmaniyam,Arie Simkhovich,Adina Golombek,Gal Sandik,Guy Ankonina,Tal Schwartz
出处
期刊:Nature Materials
[Springer Nature]
日期:2023-01-16
卷期号:22 (3): 338-344
被引量:31
标识
DOI:10.1038/s41563-022-01463-3
摘要
Transport of excitons and charge carriers in molecular systems can be enhanced by coherent coupling to photons, giving rise to the formation of hybrid excitations known as polaritons. Such enhancement has far-reaching technological implications; however, the enhancement mechanism and the transport nature of these hybrid excitations remain elusive. Here we map the ultrafast spatiotemporal dynamics of polaritons formed by mixing surface-bound optical waves with Frenkel excitons in a self-assembled molecular layer, resolving polariton dynamics in energy/momentum space. We find that the interplay between the molecular disorder and long-range correlations induced by coherent mixing with light leads to a mobility transition between diffusive and ballistic transport, which can be controlled by varying the light–matter composition of the polaritons. Furthermore, we show that coupling to light enhances the diffusion coefficient of molecular excitons by six orders of magnitude and even leads to ballistic flow at two-thirds the speed of light. The authors study ultrafast spatiotemporal dynamics of polaritons formed by mixing surface-bound optical waves with excitons observing a mobility transition from diffusive to ballistic transport flow at two-thirds the speed of light.
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