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首页> 外文期刊>Physical Review X >Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides
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Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides

机译：在单层过渡 - 金属二甲硅藻化物中嫁给激子和浆膜

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摘要

Just as photons are the quanta of light, plasmons are the quanta of orchestrated charge-density oscillations in conducting media. Plasmon phenomena in normal metals, superconductors, and doped semiconductors are often driven by long-wavelength Coulomb interactions. However, in crystals whose Fermi surface is comprised of disconnected pockets in the Brillouin zone, collective electron excitations can also attain a shortwave component when electrons transition between these pockets. In this work, we show that the band structure of monolayer transition-metal dichalcogenides gives rise to an intriguing mechanism through which shortwave plasmons are paired up with excitons. The coupling elucidates the origin for the optical sideband that is observed repeatedly in monolayers of WSe 2 and WS 2 but not understood. The theory makes it clear why exciton-plasmon coupling has the right conditions to manifest itself distinctly only in the optical spectra of electron-doped tungsten-based monolayers.
机译：正如光子是光的量子一样，等离子体是导电介质中的正弦电荷密度振荡的量子。正常金属，超导体和掺杂半导体中的等离子体现象通常由长波长库仑相互作用驱动。然而，在Fermi表面由布里渊区中的断开的袋组成的晶体中，当电子在这些凹槽之间过渡时，集体电子激发也可以获得短波部件。在这项工作中，我们表明单层过渡金属二甲基甲基甲基化物的带状结构产生了一种有趣机构，通过该机制通过该机制与短波等级将其与激子配对。耦合阐明了在WSE 2和WS 2的单层中重复观察到的光学边带的原点，但不理解。该理论清楚地明确为什么Exciton-等离子偶联具有良好的条件，仅在基于电子掺杂的钨的单层的光谱中表现出来。

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