Time-resolved observation of excitonic dynamics under coherent terahertz excitation in GaAs quantum wells
Time-resolved observation of excitonic dynamics under coherent terahertz excitation in GaAs quantum wells
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GaAs量子阱相干太赫兹激发下激子动力学的时间分辨观测
DOI：
10.1117/12.2078419
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
K. Uchida; H. Hirori; T. Aoki; C. Wolpert; K. Tanaka; T. Mochizuki; C. Kim; M. Yoshita; H. Akiyama; L. N. Pfeiffer; K. W. West
中科院分区：
文献类型：
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作者：
K. Uchida;H. Hirori;T. Aoki;C. Wolpert;T. Tamaya;K. Tanaka;T. Mochizuki;C. Kim;M. Yoshita;H. Akiyama;L. N. Pfeiffer and K. W. West;K. Uchida; H. Hirori; T. Aoki; C. Wolpert; K. Tanaka; T. Mochizuki; C. Kim; M. Yoshita; H. Akiyama; L. N. Pfeiffer; K. W. West
利用太赫兹泵浦和光探测光谱技术，我们观察到太赫兹脉冲对GaAs量子阱威尔斯的1 s重空穴激子峰产生了强烈的光谱调制。我们在时域中的精确测量表明，拉比分裂如下瞬时太赫兹电脉冲在极强的领域，但持续到一个负的延迟时间~1 ps在弱场。这种与场有关的拉比分裂动力学表明激子场电离通过减少退相时间来控制激子的非微扰非线性动力学
By means of THz pump and optical probe spectroscopy, we observed that the incident THz pulse induces a strong spectral modulation of the 1s heavy-hole exciton peak of GaAs quantum wells due to Rabi splitting. Our precise measurements in the time domain show that the Rabi splitting follows the instantaneous THz electric pulse at extremely strong fields but persists up to a negative delay time of ~1 ps at weak fields. This field dependent dynamics of the Rabi splitting indicates that the excitonic field ionization governs a nonperturbative nonlinear dynamics of excitons by causing a reduction of the dephasing time