Revealing the dark side of a bright exciton-polariton condensate.
Revealing the dark side of a bright exciton-polariton condensate.
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DOI：
10.1038/ncomms5648
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发表时间：
2014-08-13
影响因子：
16.6
通讯作者：
Huber, R.
中科院分区：
文献类型：
--
作者：
Menard, J. -M.;Poellmann, C.;Porer, M.;Leierseder, U.;Galopin, E.;Lemaitre, A.;Amo, A.;Bloch, J.;Huber, R.
玻色子的凝聚导致了超流性或超导性等壮观的现象。了解凝聚粒子的性质对于主动控制此类量子相至关重要。快速的可能性出现在光-物质耦合激发的凝聚体中，例如激子-极化激元，光子与氢类束缚电子-空穴对的杂交。到目前为止，只有光子分量已经解决，而即使是在凝聚态激子的存在受到了挑战。在这里，我们跟踪极化子凝聚物的物质成分，通过监测激子内太赫兹跃迁。我们研究了一个光暗激子库是如何形成和馈送简并态的。与原子气体不同，激子中的类原子跃迁在宏观基态布居上被戏剧性地重整化。我们的研究结果建立了极化激元凝聚和光子激射之间的根本差异，并为凝聚体的相干控制提供了可能性。 激子-极化激元是激子与光子强耦合产生的玻色准粒子，但迄今为止只分辨出了它们的光子分量。在这里，梅纳尔等人监测激子内跃迁，并研究光学暗激子库如何形成和馈送简并态。
Condensation of bosons causes spectacular phenomena such as superfluidity or superconductivity. Understanding the nature of the condensed particles is crucial for active control of such quantum phases. Fascinating possibilities emerge from condensates of light–matter-coupled excitations, such as exciton–polaritons, photons hybridized with hydrogen-like bound electron–hole pairs. So far, only the photon component has been resolved, while even the mere existence of excitons in the condensed regime has been challenged. Here we trace the matter component of polariton condensates by monitoring intra-excitonic terahertz transitions. We study how a reservoir of optically dark excitons forms and feeds the degenerate state. Unlike atomic gases, the atom-like transition in excitons is dramatically renormalized on macroscopic ground state population. Our results establish fundamental differences between polariton condensation and photon lasing and open possibilities for coherent control of condensates. Exciton–polaritons are bosonic quasi-particles resulting from strong coupling of excitons and photons but so far only their photon component had been resolved. Here, Menard et al. monitor the intra-excitonic transitions and study how a reservoir of optically dark excitons forms and feeds the degenerate state.
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影响因子：
3.7
作者：
BASTARD, G;MENDEZ, EE;ESAKI, L
通讯作者：
ESAKI, L
影响因子：
64.8
作者：
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通讯作者：
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作者：
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通讯作者：
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作者：
Nardin, Gael;Grosso, Gabriele;Deveaud-Pledran, Benoit
通讯作者：
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影响因子：
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作者：
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通讯作者：
Chemla, DS