Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand.
School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom.
Phys Rev Lett. 2015 Aug 14;115(7):077401. doi: 10.1103/PhysRevLett.115.077401.
We demonstrate an efficient switching between strong and weak exciton-photon coupling regimes in microcavity-embedded asymmetric double quantum wells, controlled by an applied electric field. We show that a fine-tuning of the electric field leads to drastic changes in the polariton properties, with the polariton ground state being redshifted by a few meV and having acquired prominent features of a spatially indirect dipolar exciton. We study the properties of dipolar exciton polaritons, called dipolaritons, on a microscopic level and show that, unlike recent findings, they are not dark polaritons but, owing to the finite size of the exciton, are mixed states with a comparable contribution of the cavity photon, bright direct, and long-living indirect exciton modes.
我们展示了在微腔嵌入式非对称双量子阱中通过外加电场实现强激子-光子耦合和弱激子-光子耦合之间的高效转换。我们表明，通过精细调节电场，可以使极化激元的性质发生剧烈变化，其中极化激元的基态发生了几毫电子伏特的红移，并获得了空间间接偶极激子的显著特征。我们在微观水平上研究了偶极激子极化激元（称为偶极子）的性质，并表明与最近的发现不同，它们不是暗极化激元，而是由于激子的有限大小，与腔光子、亮直接和长寿命间接激子模式具有相当贡献的混合态。
