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2004 Fiscal Year Final Research Report Summary

Exciton Rabi oscillation in GaAs quantum dots

Research Project

Project/Area Number 15340093
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics I
Research InstitutionTokyo Institute of Technology

Principal Investigator

MINAMI Fujio  Tokyo Institute of Technology, Department of Physics, Professor, 大学院・理工学研究科, 教授 (30200083)

Project Period (FY) 2003 – 2004
Keywordsphoton echo / Rabi oscillation / quantum dot / exciton / GaAs / dephasing
Research Abstract

We performed the photon echo experiment on GaAs quantum dots at 5K. The excitation light source was a fs Ti-Sapphire laser. The excitation photon energy was tuned to cover the lowest exciton in GaAs quantum dots. A dominant signal is observed at the zero time delay, which is due to photon echoes from the GaAs substrate and is unrelated to the quantum dots. For longer delays, we can observe a slowly decaying signal with a time constant of 〜1 ns. This signal is due to the dephasing of the exciton coherence in the quantum dots. Therefore, it can be concluded that the dephasing time of the exciton is extremely long (〜1 ns) in the quantum dots as compared to that in usual quantum wells (〜1ps).
When changing the exciting pulse power, the signal intensity of the photon echo varys greatly. The echo intensity is found to oscilate as the excitation power increases. It can be understood that this oscillation is analogous to the Rabi oscillation, which is observed in resonantly driven two level systems. It is therefore considered that we observed the Rabi oscillation of the exciton in the quantum dots. It is noted that the Rabi oscillation can be observed under relatively low excitation power. Because the Rabi oscillation is an essential phenomenon to rotate q-bit, this result shows that the semiconductor quantum dots are promising as the logical circuit material of the quantum computing.

  • Research Products

    (12 results)

All 2005 2004 Other

All Journal Article (12 results)

  • [Journal Article] Theory of multiwave mixing and decoherence control in qubit array system2005

    • Author(s)
      M.Sasaki, A.Hasegawa, J.Ishi-Hayase, F.Minami
    • Journal Title

      Phys.Rev.B 71

      Pages: 165314

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Theory of multiwave mixing and decoherence control in qubit array system2005

    • Author(s)
      M.Sasaki, A.Hasegawa, J.Ishi-Hayase, Y.Mitsumori, F.Minami
    • Journal Title

      Phys.Rev.B 71

      Pages: 165314

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Dynamics of photoinduced magnetization rotation in ferromagnetic semiconductor p-(Ga,Mn)As2005

    • Author(s)
      Y.Mitsumori, A.Oiwa, T.Slupinsi, H.Maruki, Y.Kashimua, F.Minami, H.Munekata
    • Journal Title

      Phys.Rev.B 69

      Pages: 033203

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Dynamics of photoinduced magnetization rotation in ferromagnetic semiconductor p-(Ga,Mn)As2004

    • Author(s)
      Y.Mitsumori, A.Oiwa, F.Minami, H.Munekata
    • Journal Title

      Phys.Rev.B 69

      Pages: 033203

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Thermal broadening of the exciton line in III-V semiconductor quantum dots2004

    • Author(s)
      K.Ikeda, F.Minami, N.Koguchi
    • Journal Title

      Phys.Stat.Sol C 1

      Pages: 573-576

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Multi-wave-mixing of two-dimensional excitons in semiconductors2004

    • Author(s)
      A.Hasegawa, T.Kishimoto, Y.Mitsumori, F.Minami
    • Journal Title

      J.Lumin. 108

      Pages: 215-219

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Acoustical phonon broadening of the exciton line in semiconductor single quantum dots2004

    • Author(s)
      K.Ikeda, F.Minami, S.Kuroda, K.Takita
    • Journal Title

      J.Lumin. 108

      Pages: 375-378

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Multi-wave-mixing of two-dimensional excitons in semiconductors2004

    • Author(s)
      A.Hasegawa, T.Kishimoto, Y.Mitsumori, M.Sasaki, F.Minami
    • Journal Title

      J.Lumin. 108

      Pages: 211-214

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Acoustical phonon broadening of the exciton line in semiconductor single quantum dots2004

    • Author(s)
      K.Ikeda, F.Minami, S.Kuroda, K.Takita, N.Koguchi
    • Journal Title

      J.Lumin. 108

      Pages: 375-378

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Confined electronic structure in GaAs quantum dots2004

    • Author(s)
      M.Yamagiwa, N.Sumita, F.Minami, N.Koguchi
    • Journal Title

      J.Lumin. 108

      Pages: 379-383

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Local field effect on Rabi oscillations of excitons localized to quantum islands in a single quantum well

    • Author(s)
      Y.Mitsumori, A.Hasegawa, M.Sasaki, F.Minami
    • Journal Title

      Phys.Rev.B (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Local field effect on Rabi oscillations of excitons localized to quantum islands in a single quantum well

    • Author(s)
      Y.Mitsumori, A.Hasegawa, M.Sasaki, H.Maruki, F.Minami
    • Journal Title

      Phys.Rev.B (in press)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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