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1998 Fiscal Year Final Research Report Summary

Fabrication and Study of Nanostructure Diluted Magnetic Semiconductors

Research Project

Project/Area Number 08555001
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Applied materials science/Crystal engineering
Research InstitutionResearch Institute for Scientific Measurements, Tohoku University

Principal Investigator

OKA Yasuo  RISM Tohoku University, Professor, 科学計測研究所, 教授 (60013520)

Co-Investigator(Kenkyū-buntansha) MURAYAMA Akihiro  Asahi Komag Co.Ltd, Senior Researcher, 開発部主任
J.X. Shen  東北大学, 科学計測研究所, 学振研究員
TAKAHASI Masaaki  RISM Tohoku University, Res.Associate, 科学計測研究所, 助手 (80006147)
YANATA Kohei  RISM Tohoku University, Res.Associate, 科学計測研究所, 助手 (70006146)
SHEN J.X.  RISM Tohoku University, JSPS Fellow
Project Period (FY) 1996 – 1998
Keywordssemiconductors / photons / laser / magnetism / nanostructures / thin films / crystal / dimensionarity
Research Abstract

The objective of this research project is to fabricate new nanostructure lattices composed of diluted magnetic semiconductors (DMSs) and also to study magneto-optical properties of the nanostructures. For this purposes, we have fabricated 2-dimensional quantum wells, 1-dimensional quantum wires, and 0-dimensional quantum dots by molecular beam epitaxy, atomic beam epitaxy, and electron-beam lithography techniques. Materials we have fabricated are Cd_<1-x>Mn_xTe and Cd_<1-x>Mn_xSe with Mn concentration of x= 0.03-0.3.
Obtained these nanostructures have been studied by the ultrafast laser spectroscopy using femto-second pulse lasers. Time resolved photoluminescence has been measured in Cd_<1-x>Mn_xTe quantum wells by the selective excitation of the quantum-well exciton states. The transient behavior of the exciton luminescence clearly shows the formation process of the excitonic magnetic polarons, which is suppressed by the strong external magnetic fields. Quantum dots of Cd_<1-x>Mn_xSe grown by the Stranski-Krastanow mode on ZnSe buffer layers show very fast decay of the excitons in the dots. The lifetime of the quantum dot excitons is markedly increased by the external magnetic fields. The phenomena are interpreted by decrease of the nonradiative process due to the shrinkage of the exciton wavefunction by the magnetic field. Pump-probe transient absorption spectroscopy has been made on Cd_<1-x>Mn_xTe quantum well, The exciton and magnetic polaron dynamics are observed in the 2 ps to 3 ns time region. Quantum wires of Zn_<1-x>Cd_xSe system show the photoluminescence evidence of the 1-dimensional confinement effect as well as the relaxation of the lattice strains by decreasing the wire width. Fabrication of Cd_<1-x>Mn_xSe quantum wires is under progress.
The remarkable magneto-optical effects of the nanaostructure DMSs elucidated in the present project will stimulate the research of the new magneto-optical microdevices.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Y.Oka, S.Takano, K.Egawa: "Magneto-Optical Properties and Exciton Dynamics in Cd 1-xMnxSe Quantum Dots and Cd1-xMnxTe/ZnTe Quantum Wells" Institute of Physics.Conf.Ser.152. 503-506 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Okamoto, M.Takahashi, Y.Oka: "Dynamics of Exciton Magnetic Polaron in the Cd 1-xMnxTe/ZnTe Quantum Wells" J.Lumines cence. 76/77. 211-213 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.X.Shen, Y.Oka, W.Ossau,: "Difference of Self-Energy Corrections for Charged and Uncharged States in Degenerate Two Dimensional Systems" Physica B. 249/251. 589-593 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Oka, K.Yanata, S.Takano: "Exciton Dynamics in Diluted Magnetic II-VI Semiconductor Nanostructures" J.Crystal Growth. 184/185. 920-930 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Oka, K.Yanata, H.Okamoto: "Giant Magneto-Optical Effects in Diluted Magnetic Semiconductor Nanostructures" Solid State Electronics. 42. 1267-1271 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.X.Shen, Y.Oka, W.Ossau: "Vertical Transport of Photo-Excited Carriers for Excitonic Recombinations in Modulation Doped GaAs/Ga1-xAlxAs Heterojunctions" Solid State Commun.106. 495-499 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岡 泰夫(共著): "半導体結晶成長" コロナ社, 265(22) (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Oka, S.Takano, K.Egawa: "Magneto-Optical Properties and Exciton Dynamics in Cd1-xMnxSe Quantum Dots and Cd1-xMnxTe/ZnTe Quantum Wells" Institute of Physics.Conf.Ser.152. 503-506 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Okamoto, M.Takahashi, Y.Oka: "Dynamics of Exciton Magnetic Polaron in the Cd1-xMnxTe/ZnTe Quantum Wells" J.Luminescence. 76/77. 211-213 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.X.Shen, Y.Oka, W.Ossau: "Difference of Self-Energy Corrections for Charged and Uncharged States in Degenerate Two Dimensional Systems" Physica B. 249/251. 589-593 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Oka, K.Yanata, S.Takano et al: "Exciton Dynamics in Diluted Magnetic II-VI Semiconductor Nanostructures" J.Crystal Growth. 184/185. 920-930 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Oka, K.Yanata, H.Okamoto: "Giant Magneto-Optical Effects in Diluted Magnetic Semiconductor Nanostructures" Solid State Electronics. 42. 1267-1271 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.X.Shen, Y.Oka, W.Ossau: "Vertical Transport of Photo-Excited Carriers for Excitonic Recombinations in Modulation Doped GaAs/Ga1-xAlxAs Heterojunctions" Solid State Commun.106. 495-499 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Oka: Growth and optical propterties of diluted magnetic semiconductor nanostructures in Semiconductor crystal Growth, ed.by H.Ohno. Corona Publishing Ltd.(in Japanese), (1998)

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

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Published: 1999-12-08  

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