直接进入石墨烯中的俄歇复合
Direct Access to Auger recombination in Graphene
摘要：
俄歇散射通道对于描述和理解石墨烯中的非平衡载流子动力学具有重要意义。虽然碰撞激发增加了导带中载流子的数量，并已在实验中观察到，但到目前为止，直接进入其逆过程，俄歇复合，一直难以捉摸。在这里，我们通过应用我们的超快时间分辨光电子动量显微镜的新设置来解决这个问题。我们的方法提供了同时访问载流子动力学在所有的能量和面内动量的线性色散狄拉克锥。因此，我们提供了直接的证据俄歇复合的一个子10~fs的时间尺度上，通过确定瞬态能量和动量依赖的人口远远高于激发能。我们比较我们的结果与模型计算的散射过程中的狄拉克锥，以支持我们的实验结果。
英文摘要：
Auger scattering channels are of fundamental importance to describe and understand the non-equilibrium charge carrier dynamics in graphene. While impact excitation increases the number of carriers in the conduction band and has been observed experimentally, direct access to its inverse process, Auger recombination, has so far been elusive. Here, we tackle this problem by applying our novel setup for ultrafast time-resolved photoelectron momentum microscopy. Our approach gives simultaneous access to charge carrier dynamics at all energies and in-plane momenta within the linearly dispersive Dirac cones. We thus provide direct evidence for Auger recombination on a sub-10~fs timescale by identifying transient energy- and momentum-dependent populations far above the excitation energy. We compare our results with model calculations of scattering processes in the Dirac cone to support our experimental findings.
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