Exciton lasing in carbon nanotubes below the population-inversion threshold via phonon-mediated stimulated emission,Physical Review B

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Exciton lasing in carbon nanotubes below the population-inversion threshold via phonon-mediated stimulated emission
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-10 , DOI: 10.1103/physrevb.110.125412
Stefano Dal Forno ₁ , Marco Battiato ₁

Affiliation

Excitonic optical transitions in carbon nanotubes (CNTs) have been extensively studied for at least two decades. However, exploiting these transitions to produce a lasing effect has proven to be unpractical due to the difficulties of achieving an excitonic population inversion in carbon nanotubes. In this work we show that lasing is theoretically possible at a much lower exciton population threshold by taking advantage of phonon stimulated emission. Specifically, the so-called anti-Stokes transitions, where light is generated by the creation of a phonon and the annihilation of an exciton, can be used to sustain the coherent emission of photons. These transitions have been overlooked for long due to their low intensity as a consequence of the low occupancy of the associated phonon branches. We show that the best conditions to achieve the lasing effect are met in CNTs with (i) excitons of nonzero momentum, (ii) a strong exciton-phonon coupling, and (iii) narrow exciton transitions.

中文翻译：

通过声子介导的受激发射在碳纳米管中激子激射低于布居反转阈值

碳纳米管（CNT）中的激子光学跃迁已经被广泛研究了至少二十年。然而，由于在碳纳米管中实现激子粒子数反转的困难，利用这些转变来产生激光效应已被证明是不切实际的。在这项工作中，我们表明，通过利用声子受激发射，理论上可以在低得多的激子数量阈值下产生激光。具体来说，所谓的反斯托克斯跃迁，即通过声子的产生和激子的湮灭而产生光，可用于维持光子的相干发射。由于相关声子分支的占用率较低，这些跃迁的强度较低，因此长期以来一直被忽视。我们表明，碳纳米管满足实现激光效应的最佳条件：（i）非零动量激子，（ii）强激子-声子耦合，以及（iii）窄激子跃迁。

更新日期：2024-09-10

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