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arXiv 2004.09790cond-mat.quant-gas
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有机极化激元凝聚体中的非相干电荷输运

Incoherent charge transport in an organic polariton condensate

M. Ahsan Zeb, Peter G. Kirton, Jonathan Keeling

备注：
21 pages, 8 figures
发表信息：
Physical Review B 106, 195109 (2022)
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摘要：

我们研究极化激元凝聚如何改变有机材料中的电荷输运。在典型的有机材料中，电荷传输通过非相干跳跃进行。因此，我们提供了一种方法来确定如何的速率和最终状态的跳跃过程是由强物质光耦合和极化激元凝聚的影响。我们展示了如何跳跃过程可能会产生激发时，从一个有限的激发密度的状态。也就是说，跳跃如何通过创造上极化激元、光学惰性激子暗态或激发振动边带来改变下极化激元凝聚体的状态。虽然这些过程的矩阵元素可以很大，但对于室温下的典型材料，这种激发受到热因素的抑制，并且基态过程占主导地位。因此，我们研究了如何基态跳跃率取决于凝聚密度，物质-光耦合，和腔光子失谐。所有这些因素都改变了与光学活性分子相关的振动构型，这可以通过增加或减少与带电分子状态的振动重叠来增强或抑制跳跃。我们发现，跳跃率可以指数敏感失谐和凝聚密度，允许增加或减少两个数量级的跳跃率。

英文摘要：

We study how polariton condensation modifies charge transport in organic materials. In typical organic materials, charge transport proceeds via incoherent hopping. We therefore provide an approach to determine how the rate and final state of this hopping process is affected by strong matter-light coupling and polariton condensation. We show how the hopping process may create excitations when starting from a state with a finite excitation density. That is, how hopping can change the state of a lower polariton condensate by creating upper polaritons, optically inactive excitonic dark states, or by exciting vibrational sidebands. While the matrix elements for these processes can be large, for typical materials at room temperature, such excitations are suppressed by thermal factors, and ground state processes dominate. We thus study how the ground state hopping rate depends on condensate density, matter-light coupling, and cavity photon detuning. All these factors change the vibrational configuration associated with the optically active molecules, which can enhance or suppress hopping by increasing or decreasing the vibrational overlap with the state of a charged molecule. We show that hopping rates can be exponentially sensitive to detuning and condensate density, allowing an increase or decrease of hopping rate by two orders of magnitude.

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