Ultrafast Quantum Beats and Optical Dephasing of Exciton Systems in β-ZnP_2 by Spectrally Resolved Four-Wave Mixing

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概要

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• We have performed spectrally resolved degenerate four-wave mixing (FWM) spectroscopy on exciton systems in β-ZnP_2 using a femtosecond laser. The FWM signal clearly exhibits a periodic ultrafast modulation as a function of the delay time between two excitation pulses, which indicates the quantum beats due to the interference of two closely spaced transitions. From FWM and reflection spectra, the transitions are assigned to the 1s free exciton and the bound exciton. Dephasing times of the 1s exciton polariton are measured at various energies between the longitudinal and transverse excitons. The dephasing time is found to be longer as the polariton energy is lower, which suggests that the scatterings by acoustic phonons mainly govern the polariton dephasing. The difference in the modulation behavior of the quantum beats for the free and bound excitons is briefly discussed based on a simple model with a three-level system.

• 社団法人日本物理学会の論文
• 2003-08-15

著者

• ITOH Hiroshi

  Department of Internal Medicine, Keio University School of Medicine

• IMAI Yutaka

  Department of Clinical Pharmacology and Therapeutics, Tohoku University

• 有本 收

  京薬大物理

• Imai Yutaka

  Department Of Clinical Pharmacology And Therapeutics Tohoku University

• Imai Yutaka

  東北大学 臨床薬学

• MIYAMOTO Shinzo

  Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University

• Itoh Hiroshi

  Department Of Astronomy Kyoto University

• IMAI Yutaka

  Study Group for Pathophysiology and Treatment in Elderly Hypertensive Patients

• Noguchi S

  Department Of Electronics University Of Osaka Prefecture

• Imai Y

  Department Of Clinical Pharmacology And Therapeutics Tohoku University

• Arimoto Osamu

  Department of Physics, Faculty of Science, Okayama University

• Sakamoto Makoto

  Niigata Technical Junior College

• Arimoto Osamu

  Department Of Physics Faculty Of Science Okayama University

• Nakanishi S

  Department Of Advanced Materials Science Faculty Of Engineering Kagawa University

• SAKAMOTO Mieko

  Department of Physics, Faculty of Science, Okayama University

• NAKANISHI Shunsuke

  Department of Advanced Materials Science, Faculty of Engineering, Kagawa University

• Sakamoto Mieko

  Division Of Cardiology Kumamoto Central Hospital

• Imai Yutaka

  Graduate School Of Pharmaceutical Sciences Tohoku University

• Sakamoto Mieko

  Department Of Cardiovascular Medicine Graduate School Of Medical Sciences Kumamoto University

• Itoh Hiroshi

  Department Of Aeronautics And Astronautics The University Of Tokyo

• Itoh Hiroshi

  Department Of Advanced Materials Science Faculty Of Engineering Kagawa University

• Nakanishi S

  College Of Integrated Arts And Sciences University Of Osaka Prefecture

• ITOH Hiroshi

  Department of Advanced Materials Science, Faculty of Engineering, Kagawa University

• 有本 収

  京大.理

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