Ultrafast Exciton Dynamics in a ZnO Thin Film
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概要
- 論文の詳細を見る
We report the behavior of utrafast exciton dynamics in a ZnO thin film based on temperature-, pump-energy-, and pump-power-dependent degenerate pump–probe experiments. When the pump energy is higher than the emission peak, either dominated by free exciton or donor-bound exciton, a Stokes shift of about 20 meV can be observed. In this situation, rapid thermalization process (in several ps) followed by an exciton relaxation stage (7 to 104 ps) is recorded. The relaxation into the donor-bound exciton level takes a longer time because a spatial transport process is required. When the pump energy is lower than the emission peak, the optical-field-induced red shift of the absorption spectrum results in an enhanced absorption for the probe can be observed. This effect recovers in several ps.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2009-02-25
著者
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Zhang Bao-ping
Photodynamics Research Center The Insititute Of Physical And Chemical Research (riken)
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Segawa Yusaburo
Photodynamics Research Center Frontier Research Program The Institute Of Physical And Chemical Resea
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Feng Shih-Wei
Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan, R.O.C.
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Wang Hsiang-Chen
Graduate Institute of Opto-Mechatronics, National Chung Cheng University, Chia-Yi, Taiwan, R.O.C.
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Yang C.
Graduate Institute of Electro-Optical Engineering and Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, R.O.C.
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Zhang Bao-Ping
Photodynamics Research Center, RIKEN (The Institute of Physical and Chemical Research), Sendai 980-0845, Japan
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Segawa Yusaburo
Photodynamics Research Center, RIKEN (The Institute of Physical and Chemical Research), Sendai 980-0845, Japan
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