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Dynamic polariton condensation in a single GaN nanowire-dielectric microcavity

机译:单个GaN纳米线-电介质微腔中的动态极化子凝聚

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We have experimentally investigated the dynamic polariton condensation behavior in a single GaN nanowire strongly coupled to a dielectric microcavity under nonresonant optical excitation. Both time-integrated and time-resolved polariton luminescence measurements have been made in the temperature range of 25 to 100 K (corresponding to exciton-cavity photon detuning of - 3.0 to + 4.2 meV). Polariton lasing is observed in the entire temperature range, with the lowest threshold energy of 57 nJ/cm~2 measured at 50 K (δ = -1.3 meV). All the measurements indicate that at the lower temperatures the degenerate polariton condensate is not in thermal equilibrium with the phonon bath. At 85 and 100 K (δ = + 2.3 and 4.2 meV), the system attains a state close to thermal equilibrium via dynamic Bose condensation. The best results are obtained at T_(latt) = 85 K, for which T_(LP) = 88.8 K, and this is the highest temperature recorded for an equilibrium phase transition in exciton-polariton condensates.
机译:我们已经实验研究了在非共振光激发下强耦合到介电微腔的单根GaN纳米线中的动态极化子凝聚行为。在25至100 K的温度范围内进行了时间积分和时间分辨极化子发光测量(对应于激子腔光子失谐-3.0至+ 4.2 meV)。在整个温度范围内观察到极化激射,在50 K(δ= -1.3 meV)下测得的最低阈值能量为57 nJ / cm〜2。所有测量结果均表明,在较低温度下,简并极化子冷凝物与声子浴之间未达到热平衡。在85和100 K(δ= + 2.3和4.2 meV)时,系统通过动态Bose冷凝达到接近热平衡的状态。最佳结果在T_(latt)= 85 K,T_(LP)= 88.8 K时获得,这是激子-极化子冷凝物中平衡相变记录的最高温度。

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