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Coherent control of photo-excited carriers in semiconductor quantum dots using near-field scanning optical microscope

Research Project

Project/Area Number 12650035
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied optics/Quantum optical engineering
Research InstitutionHokkaido University

Principal Investigator

TODA Yasunori  Hokkaido Univ., Grad.School of Eng., Associate Prof., 大学院・工学研究科, 助教授 (00313106)

Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsNear-field scanning optical microscope / Quantum dot / Coherent control
Research Abstract

The strain-driven self-assembly of semiconductor quantum dots (SAQDs) provides nanometer scale carrier confinement in all three dimensions. One of the fascinating characteristics of SAQDs is their discrete density of states (DOS) with large energy-level spacing, in which acoustic phonon-mediated scattering should be suppressed compared with higher-dimensional structures. As a consequence, excitons in SAQDs are expected to exhibit long coherence time, which is advantageous for application of quantum information processing. In terms of inter-level relaxation, interaction with longitudinal optical (LO) phonons is an important aspect of SAQDs. These phonon-mediated transitions can be confirmed in the single-dot photoluminescence excitation (PLE) spectra, in which the reduction of relaxation paths renders individual LO phonons visible in the ground state emissions. To date several LO phonon-related transitions including bulk GaAs have been clearly observed. In the energy region higher than … More 1LO, single-dot PLE spectra reveal a number of intense PLE features, recognized as 2LO phonon resonances. As excitonic excited states are also present, several relaxation pathways with qualitatively different processes exist in the 2LO region.
In this research, we investigate in detail the 2LO resonances in the single-dot PLE. Several 2LO resonances emerge as dip structures in the peaks under various conditions of excitation power. The observed dip structures suggest line broadening, even in the individual resonace lines. In contrast, the corresponding biexciton resonances still have sharp peaks, indicating that the 2LO resonances consist of several relaxation channels with differing scattering processes. These observations can explain why PLE resonances exhibit short dephasing times even in single SAQDs. Moreover, we found that phonon mediated transitions can be largely removed by two-color excited PLE spectroscopy. The reduction of line broadening indicates that the PLE includes a number of phonon-related transitions with large relaxation windows. Less

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Yasunori Toda: "Observation of dip structures in PLE spectra of a highly excited single self-assembled quantum dot"Physica E. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Toda: "Quantum interference due to continuum states in single self-assembled quantum dots"Technical Digest of Quantum Electronics and Laser Science Conference. 20-21 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasunori Toda: "Resonant Raman scattering of optical phonons in self-assembled quantum dots"Physica E. 8. 328-332 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasunori Toda: "Near-field coherent excitation spectroscopy of InGaAs/GaAs self-assembled quantum dots"Applied Physics Letters. 76. 3887-3889 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasunori Toda: "Near-field spectroscopy of a single InGaAs self-assembled quantum dots"IEEE Journal of Selected Topics in Quantum electronics. 6. 528-533 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Toda: "Time correlation measurement on single self-assembled quantum dots"Technical Digest of Quantum Electronics and Laser Science Conference. 36-36 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Toda: "Carrier interaction in self-assembled quantum dots studied by single dot spectroscopy"Technical Digest of Quantum Electronics and Laser Science Conference. 75-75 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Toda: "Near-field spectroscopy of a single InGaAs quantum dot"Proceedings of the Fourth Symposium on Atomic-scale Surface and lnterface Dynamics. 71-74 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Toda: "Many body effects in single self-assembled quantum dots observed by near-field photoluminescence excitation spectroscopy"Proceedings of International Conference on the Physics of Semiconductors. D. 300-300 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasunori Toda: "Observation of dip structures in PLE spectra of a highly excited single self-assembled quantum dot"Physica E. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Toda: "Quantum interference due to continuum states in single self-assembled quantum dots"Technical Digest of Quantum Electronics and Laser Science Conference. 20-21 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasunori Toda: "Resonant Raman scattering of optical phonons in self-assembled quantum dots"Physica E. 8. 328-332 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasunori Toda: "Near-field coherent excitation spectroscopy of InGaAs/GaAs self-assembled quantum dots"Applied Physics Letters. 76. 3887-3889 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasunori Toda: "Near-field spectroscopy of a single InGaAs self-assembled quantum dots"IEEE Journal of Selected Topics in Quantum electronics. 6. 528-533 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Toda: "Time correlation measurement on single self-assembled quantum dots"Technical Digest of Quantum Electronics and Laser Science Conference. 36-36 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Toda: "Carrier interaction in self-assembled quantum dots studied by single dots spectroscopy"Technical Digest of Quantum Electronics and Laser Science Conference. 75-75 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Toda: "Near-field spectroscopy of a single InGaAs quantum dot"Proceedings of the Fourth Symposium on Atomic-scale Surface and Interface Dynaics. 71-74 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Toda: "Many body effects in single self-assembled quantum dots observed by near-field photoluminescence excitation spectroscopy"Proceedings of International Conference on the Physics of Semiconductors. D. 300-300 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasunori Toda: "Observation of dip structures in PLE spectra of a highly excited single self-assembled quantum dot"Physica E. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y. Toda: "Quantum interference due to continuum states in single self-assembled quantum dots"Technical Digest of Quantum Electronics and Laser Science Conference. 20-21 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yasunori Toda: "Resonant Raman scattering of optical phonons in self-assembled quantum dots"Physica E. 8. 328-332 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yasunori Toda: "Near-field coherent excitation spectroscopy of InGaAs/GaAs self-assembled quantum dots"Applied Physics Letters. 76. 3887-3889 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yasunori Toda: "Near-field spectroscopy of a single InGaAs self-assembled quantum dots"IEEE Journal of Selected Topics in Quantum electronics. 6. 528-533 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y. Toda: "Time correlation measurement on single self-assembled quantum dots"Technical Digest of Quantum Electronics and Laser Science Conference. 36-36 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y. Toda: "Carrier interaction in self-assembled quantum dots studied by single dot spectroscopy"Technical Digest of Quantum Electronics and Laser Science Conference. 75-75 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y. Toda: "Near-field spectroscopy of a single InGaAs quantum dot"Proceedings of the Fourth Symposium on Atomic-scale Surface and Interface Dynaics. 71-74 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y. Toda: "Many body effects in single self-assembled quantum dots observed by near-field photoluminescence excitation spectroscopy"Proceedings of International Conference on the Physics of Semiconductors. D. 300-300 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Toda: "Near-field coherent excitation spectroscopy of InGaAs/GaAs self-assembled quantum dots"Applied Physics Letters. 76. 3887-3889 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Toda: "Near-field spectroscopy of a single InGaAs self-assembled quantum dots"IEEE Journal of Selected Topics in Quantum electronics. 6. 528-530 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Toda: "Many body effects in single self-assembled quantum dots observed by near-field photoluminescence excitation spectroscopy"Proceedings of International Conference on the Physics of Semiconductors. D. D300-300 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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