Breusing Markus, Ropers Claus, Elsaesser Thomas
Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany.
Phys Rev Lett. 2009 Feb 27;102(8):086809. doi: 10.1103/PhysRevLett.102.086809.
Optical pump-probe spectroscopy with 7-fs pump pulses and a probe spectrum wider than 0.7 eV reveals the ultrafast carrier dynamics in freestanding thin graphite films. We discern for the first time a rapid intraband carrier equilibration within 30 fs, leaving the system with separated electron and hole chemical potentials. Phonon-mediated intraband cooling of electrons and holes occurs on a 100 fs time scale. The kinetics are in agreement with simulations based on Boltzmann equations.
使用7飞秒泵浦脉冲和宽度超过0.7电子伏特的探测光谱进行光泵浦-探测光谱研究，揭示了独立薄石墨膜中的超快载流子动力学。我们首次发现在30飞秒内存在快速的带内载流子平衡，使系统具有分离的电子和空穴化学势。电子和空穴的声子介导带内冷却发生在100飞秒的时间尺度上。动力学与基于玻尔兹曼方程的模拟结果一致。
