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Title: Time-resolved observation of coherent excitonic nonlinear response with a table-top narrowband THz pulse wave

By combining a tilted-pulse-intensity-front scheme using a LiNbO{sub 3} crystal and a chirped-pulse-beating method, we generated a narrowband intense terahertz (THz) pulse, which had a maximum electric field of more than 10 kV/cm at around 2 THz, a bandwidth of ∼50 GHz, and frequency tunability from 0.5 to 2 THz. By performing THz-pump and near-infrared-probe experiments on GaAs quantum wells, we observed that the resonant excitation of the intraexcitonic 1s-2p transition induces a clear and large Autler-Townes splitting. Our time-resolved measurements show that the splitting energy observed in the rising edge region of electric field is larger than in the constant region. This result implies that the splitting energy depends on the time-averaged THz field over the excitonic dephasing time rather than that at the instant of the exciton creation by a probe pulse.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ; ;  [2] ;  [1] ;  [5] ;  [3] ; ; ; ;  [6] ; ;  [7]
  1. Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan)
  2. Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501 (Japan)
  3. (Japan)
  4. CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012 (Japan)
  5. (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501 (Japan)
  6. Institute for Solid State Physics, University of Tokyo, and JST-CREST, Kashiwa, Chiba 277-8581 (Japan)
  7. Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544 (United States)
Publication Date:
OSTI Identifier:
22486145
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTALS; ELECTRIC FIELDS; EXCITATION; GALLIUM ARSENIDES; GHZ RANGE 01-100; LITHIUM COMPOUNDS; NIOBATES; NIOBIUM OXIDES; NONLINEAR PROBLEMS; PULSES; QUANTUM WELLS; TIME RESOLUTION