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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationUltrafast Phenomena and Nanophotonics XIX
EditorsMarkus Betz, Kong-Thon Tsen, Abdulhakem Y. Elezzabi
PublisherSPIE
ISBN (Electronic)9781628414516
DOIs
StatePublished - 2015
Externally publishedYes
EventUltrafast Phenomena and Nanophotonics XIX - San Francisco, United States
Duration: Feb 8 2015Feb 11 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9361
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceUltrafast Phenomena and Nanophotonics XIX
Country/TerritoryUnited States
CitySan Francisco
Period2/8/152/11/15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Exciton
  • Nonlinear optics
  • Quantum well
  • THz spectroscopy
  • Ultrafast phenomena

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