Time-resolved observation of excitonic dynamics under coherent terahertz excitation in GaAs quantum wells

K. Uchida; H. Hirori; T. Aoki; C. Wolpert; K. Tanaka; T. Mochizuki; C. Kim; M. Yoshita; H. Akiyama; L. N. Pfeiffer; K. W. West

doi:10.1117/12.2078419

14 March 2015 Time-resolved observation of excitonic dynamics under coherent terahertz excitation in GaAs quantum wells

K. Uchida, H. Hirori, T. Aoki, C. Wolpert, K. Tanaka, T. Mochizuki, C. Kim, M. Yoshita, H. Akiyama, L. N. Pfeiffer, K. W. West

Author Affiliations +

Proceedings Volume 9361, Ultrafast Phenomena and Nanophotonics XIX; 93611G (2015) https://doi.org/10.1117/12.2078419
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

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

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K. Uchida, H. Hirori, T. Aoki, C. Wolpert, K. Tanaka, T. Mochizuki, C. Kim, M. Yoshita, H. Akiyama, L. N. Pfeiffer, and K. W. West "Time-resolved observation of excitonic dynamics under coherent terahertz excitation in GaAs quantum wells", Proc. SPIE 9361, Ultrafast Phenomena and Nanophotonics XIX, 93611G (14 March 2015); https://doi.org/10.1117/12.2078419

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