石墨烯中瞬态population inversion和光增益的微观机制
Microscopic mechanism for transient population inversion and optical gain in graphene
摘要：
Li等人最近报道了石墨烯中的瞬态飞秒粒子数反转，物理修订版信函108，167401（2012）中所述。基于微观理论，我们澄清了潜在的微观机制：瞬态增益和人口反转发生在石墨烯由于强的光泵浦和载流子冷却，填充状态接近狄拉克点引起的弛豫瓶颈的复杂的相互作用。随后的飞秒衰减的光学增益主要是由库仑诱导的俄歇复合。
英文摘要：
A transient femtosecond population inversion in graphene was recently reported by Li et al., Phys. Rev. Lett. 108, 167401 (2012). Based on a microscopic theory we clarify the underlying microscopic mechanism: Transient gain and population inversion in graphene occurs due to a complex interplay of strong optical pumping and carrier cooling that fills states close to the Dirac point giving rise to a relaxation bottleneck. The subsequent femtosecond decay of the optical gain is mainly driven by Coulomb-induced Auger recombination.
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