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arXiv 2411.02458cond-mat.mes-hall
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法拉第几何中磁场调控量子阱激子-极化激元激光阈值:理论研究

Tuning the lasing threshold of quantum well exciton-polaritons under a magnetic field in Faraday geometry: a theoretical study

Le Tri Dat, Nguyen Dung Chinh, Vinh N. T. Pham, Vo Quoc Phong, Nguyen Duy Vy

AI总结:

本研究通过理论分析揭示磁场可调节量子阱激子-极化激元的激光阈值,低能泵浦下磁场延迟阈值,高能泵浦下降低阈值并增加凝聚数量,为低阈值极化激元激光器设计提供指导。

摘要:

极化激元激光是一种有前景的现象,在无需粒子数反转的下一代激光器中具有潜在应用。对量子阱施加垂直磁场会显著改变激子-极化激元的性质。在本理论研究中,我们探讨了量子阱激子-极化激元的激光阈值如何依赖于磁场。通过改变激子的有效质量和拉比劈裂,磁场引起弛豫动力学的显著变化,这直接影响激光阈值。对于低能量泵浦,磁场的增加延迟了激光阈值,而对于高能量泵浦,阈值在更低的泵浦强度下即可达到。此外,增加泵浦能量和磁场均能提高弛豫效率,导致凝聚极化激元的数量大幅增加。我们的结果为通过磁场调控激子-极化激元凝聚提供了见解,并对低阈值极化激元激光器的设计具有潜在意义。

英文摘要:

Polariton lasing is a promising phenomenon with potential applications in next-generation lasers that operate without the need for population inversion. Applying a perpendicular magnetic field to a quantum well (QW) significantly alters the properties of exciton-polaritons. In this theoretical study, we investigate how the lasing threshold of QW exciton-polaritons depends on the magnetic field. By modifying the exciton's effective mass and Rabi splitting, the magnetic field induces notable changes in the relaxation kinetics, which directly affect the lasing threshold. For low-energy pumping, an increase in the magnetic field delays the lasing threshold, while for high-energy pumping, the threshold is reached at much lower pump intensities. Furthermore, increasing both the pump energy and the magnetic field enhances relaxation efficiency, leading to a substantially larger number of condensed polaritons. Our result gives insights into the modulation of exciton-polariton condensation through magnetic fields, with potential implications for the design of low-threshold polariton lasers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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