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1991 Fiscal Year Final Research Report Summary

"A Series of Studies on Polarons, Excitons, New Condensed States of Elementary Excitations into the Mechanism of Superconductive-Conjugate Photoconductive Phenomean"

Research Project

Project/Area Number 01065001
Research Category

Grant-in-Aid for Specially Promoted Research

Allocation TypeSingle-year Grants
Research InstitutionThe University of Tokyo, College of Arts and Sciences.

Principal Investigator

MASUMI Taizo  The University of Tokyo, College of Arts and Sciences Department of Pure and Applied Sciences, Professor, 教養学部, 教授 (20012304)

Co-Investigator(Kenkyū-buntansha) KUROSAWA Tatsumi  Chuo University, Faculty of Science and Engineering, Department of Physics, Prof, 理工学部, 教授 (80055061)
MINAMI Hidetoshi  The University of Tokyo, Colloge of Arts and Sciences Department of Pure and App, 教養学部, 助手 (00190702)
Project Period (FY) 1989 – 1991
KeywordsElementary Excitations / Polarons / Excitons / Condensed States / Superconductive Insulator / Superconductive-Conjugate Photoconductivity / Superconductive-Conjugate Photoresponse / Superconductive Optoelectronics
Research Abstract

1) Crystal Growth and Refinement of Ultrapure Silver Halides, Mixed Crysitals and of Superconductive-Conjugate Photoconductive Substances ; We have prepared ultrapure AgCl_xBr_<1-x> crystals, a series of superconductive-conjugate photoconductive substances Y-Ba-Cu-O, La-Cu-O, Ba-Pb-Bi-O, Bi-Sr-Ca-Cu-O, Nd-Ce-Cu-O, Bi-SrCa (Lay) -Cu-O systems, and refined their basic substances Cu_2O, Bi_2O_3.
2) New Condensed States of Elementary Excitations in High-Speed and Highly-Resolved Optical Experiment ; We have confirmed the two-to one-phonon mode type transformation in AgCl_xBr_<1-x> via FIR reflection spectra, and particularly reexamined the temperature dependence of FIR reflection and optical absorbance of pure Cu_2O in a basic aspect of the superconductive-conjugate phenomena.
3) Nonlinear Responses, Anomalous Distribution, and Dynamics of Carriesr or Polarons at Crossed Intense Electric and Magnetic Fields ; We have newly observed an anomalous reduction in the electron-LO phonon coupling co … More nstant in AgCl_xBr_<1-x> and a role of the acoustic phonons in polaron dynamics at the momentum space accumulation in piezoelectric semiconductors Cds.
4) Superconductive-Conjugate Photocondutivity due to Ploarons and Excitons and their Mechanism ; We have intensively and extensively examined the conjugative phenomena between photoconductivity and superconductivity of the Y_<3-x>-Ba_x-Cu_3-O_z, Ba_1-Pb_<1-x>-Bi_x-O_3, Nd_2-Cu_1-O_4 and Bi_2-(Sr_2Y_1)_x-Cu_2-O_z systems and their basic substance Cu_2O, Bi_2O_3 to experimentally clarify the correlation between anomalies in photoconductivity and occurrence of superconductivity. We have observed also similar correlation in C_<60> and SrCuO_2.
5) Photomagnetism due to Elementary Excitation and their Condensed States with Relaxation in Polar Semiconductors and Ionic Crystals ; We have pursued the photomagnetism by studying cyclotron resonance of polarons in Cu_2O at high density excitations and discovered a peculiar type of orbital diamagnetism which reveals an existence of mid-gap states via a new optical-cyclotron duouble resonance method.
6) Basic Concepts of Superconductive Optoelectronic Devices ; We have proposed the possibilities to constitute several of supercon ductive optoelectronic devices and apparatus by combining superconductive oxides and superconductive-conjugate photoconductors close to each other in compositions or their basic substances Cu_2O, Bi_2O_3. United State Patents on these item have been granted.
7) Theoretical Studies of Nonlinear Responses and Dyanmics of Polaron, Elementary Excitations and their Condensation, and of the Mechanism of the Superconductive-Conjugate Photoconductivity ; We have given a computer analysis of the band warping effect on the streaming and bunching phenomena in semiconductors. We have also proposed a hypothesis on the mechanism of superconductive-conjugate photoconductivity.
United States Patent (Granted), US Patent No. 4, 990, 487 ; Date : Feb. 5th, 1991 valid until Feb. 5, 2008 ; "SUPERCONDUCTIVE OPTOPELECTRONIC DEVICES", Inventor : Taizo Masumi, Assigne : The University of Tokyo.
USPTO Notice of Allowance, dated Jan. 24th, 1992, US Appl. No07/696, 999 : THE UNIVERSITY OF TOKYO, Inventor : Taizo Masumi, For : "PHOTOCONDUCTIVE-SUBSTANCE OF THE Y-BA-CU-O SYSTEM AND A METHOD FOR PRODUCING THE SAME"(AS AMENDED). Less

  • Research Products

    (42 results)

All Other

All Publications (42 results)

  • [Publications] Taizo Masumi: "Nonlinear Transport and Optical Phenomena in Silver Halides due to Polarons and Excitons" J.Soc.Photogr.Sci.Technol.Japan. 53. 140-143 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taizo Masumi: "Nonlinear Energy Spectra,Anomalous Distribrtion and Life Time of Polarons and Excitons in Silver Halides" Proc.The 44th Annual Conf.the Soc.Imaging Science and Technology,May,1991,St.Paul,USA. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shoji Mimotogi: "Transition of Hybridization of Lattice Vibrational Modes in the Mixed Crystal System AgCl_XBr_<1-X>" Proc.20th Int.Conf.Phys.Semiconductors.Thessaloniki,Greece,Aug.6-10,(1990). 2021-2024 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shoji Mimotogi: "Transformation of Phonon Mode Begaviour in the AgCl_XBr_<1-X> System" J.Phys.Soc.Japan. 61. 727-734 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shoji Mimotogi: "Anomalous Electron-LO Phonon Interaction in Cyclotron Resonance of Polarons in the Mixed AgCl_XBr_<1-X> System" J.Phys.Soc.Japan. 61. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroshi Shimada: "Dynamics of Hot Electrons Accumulated in the Velocity-Space of CdS with Acoustic Phonon Interaction" J.Phys.Soc.Japan. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroshi Shimada: "Hall Mobility of Positive Holes in Cu_2O" J.Phys.Soc.Japan.58. 1717-1724 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taizo Masumi: "New Cyclotron Resonance of Hole and Electron Plasma in Cu_2O at High Density Excitation" Proc.20th Int.Conf.Phys.Semiconductors.Thessaloniki,Greece,Aug.6-10,(1990). 2295-2298 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hidetoshi Minami: "Influence of Exction Formation Effect in the Photoconductivity of New Semiconductor Bi_2O_<3;>;M^<2+>" Proc.20th Int.Conf.Phys.Semiconductors.Thessaloniki,Greece,Aug.6-10,(1990). 2299-2302 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hidetoshi Minami: "Spectra of Magneto-Photoconductivity of Semimagnetic Semiconductors Cd_<0.8>Mn_<0.2>Te" Solid State Commun.72. 31-35 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taizo Masumi: "Superconductive-Conjugate Photoconductivity of the Bi_2(Sr_2Ca_1)_<1-X>(La_2Y_1)_XCu_2O_Z System" Physica. C185-189. 967-968 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroyuki Yamaguchi: "Superconductive-Conjugate Photoconductivity of Nd_2Cu_1O_4" Physica. C185-189. 965-966 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hidetoshi Minami: "Electronic Transport Phenomena in Semiconductive Phase BaPh_<1-X>Bi_XO_3" Physica. C185-189. 1257-1258 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taizo Masumi: "Dielectric Anomalies and Photoconducivity in Host Insulator Cu_2O Correlative with High-T_C Superconductivity" J.Phys.Soc.Japan. 60. 3625-3628 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taizo Masumi: "Nonlinear Optical Phenomena in Cyclotron Resonance of Positive Holes and Electrons in Cu_2O" J.Phys.Soc.Japan. 60. 3629-3632 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taizo Masumi: "An Obsevation of Quantized Step or Clew Temperatures in Supercondrctive-Conjugate Photoconductivity of Cu_2O" J.Phys.Soc.Japan. 60. 3633-3636 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taizo Masumi: "Superconductive-Conjugate Photoconductivity in Host Insulators of the Y_<3-X>-Ba_X-Cu_3-O_Z System" J.Phys.Soc.Japan. 60. 4036-4039 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hidetoshi Minami: "Novel Temperature Dependence of Photoconductivity in New Semiconductor Bi_2O_<3;>M^<2+>" J.Phys.Soc.Japan. 60. 4040-4043 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hidetoshi Minami: ""Spectral Photoconductivity of the BaPb_<1-x>Bi_XO_3 System with a Proposal for the Electronic Structure"" PHASE TRANSITIONS. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Norihisa Ishida: "DC Field Response of Carriers Bunched in Momentum Space under Crossed Intense Microwave and Magnetic Fields"" Proc.7th Int.Conf.on Hot Carriers,Nara,(1991). (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tatsumi Kurosawa: "Momentum Space Bunching of Carriers in Semiconductor under Crossed Magnetic and Intensee Microwave Fields.II.Warped Band Case" J.Phys.Soc.Japan. 60. 4245-4252 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taizo Masumi: ""Nonlinear Transport and Optical Phenomena in Silver Halides due to Polarons and Excitons"" J. Soc. Photogr. Sci. Technol. Japan. 53. 140-143 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taizo Masumi: ""Nonlinear Energy Spectra, Anomalous Distribution and Life Time of Polarons and Excitons in Silver Halides"" Proc. The 44th Annual Conf. the Soc. Imaging Science and Technology, St Paul, USA. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shogi Mimotogi: ""Transition of Hybridization of Lattice Vibrational Modes in the Mixed Crystal System AgCl_xBr_<1-x>"" Proc. 20th Int. Conf. Phys. Semiconductors, Thessaloniki, Greece, Aug. 6-10. 2021-2024 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shoji Mimotogi: ""Transformation of Phonon Mode Behaviour in the AgCl_xBr_<1-x> System"" J. Phys. Soc. Japan. 61. 727-734 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shoji Mimotogi: ""Anomalous Electron-LO Phonon Interaction in Cyclotron Resonance of Polarons in the Mixed AgCl_xBr_<1-x> System"" J. Phys. Soc. Japan. 61. NO. 5 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Shimada: ""Dynamics of Hot Electrons Accumulated in the Velocity-Space of CdS with Acoustic Phonon Interaction"" J. Phys. Soc. Japan. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Shimada: ""Hall Mobility of Positive Holes in Cu_2O"" J. Phys. Soc. Japan. 58. 1717-1724 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taizo Masumi: ""New Cyclotron Resonance of Hole and Electron Plasma in Cu_2O at High Density Excitation"" Proc. 20th Int. Conf. Phys. Semiconductors, Thessaloniki, Greece, Aug. 6-10. 2295-2298 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hidetoshi Minami: ""Influence of Exciton Formation Effect in the Photoconductivity of New Semiconductor Bi_2O_3 ; M^<2+>"" Proc. 20th Int. Conf. Phys. Semiconductors, Thessaloniki, Greece, Aug. 6-10. 2299-2302 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hidetoshi Minami: ""Spectra of Magneto-Photoconductivity of Semimagnetic Semiconductors Cd_<0.8>Mn_<0.2>Te"" Solid State Commun.72. 31-35 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taizo Masumi: ""Superconductive-Conjugate Photoconductivity of the Bi_2(Sr_2Ca_1)_<1-x>(La_2Y_1)_xCu_2O_z System"" Physica C. 185-189. 967-968 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroyuki Yamaguchi: ""Superconductive-Conjugate Photoconductivity of Nd_2Cu_1O_4"" Physica C. 185-189. 965-966 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hidetoshi Minami: ""Electronic Transport Phenomena in Semiconductive Phase BaPb_<1-x>Bi_xO_3"" Physica C. 185-189. 1257-1258 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taizo Masumi: ""Dielectric Anomalies and Photoconductivity in Host Insulator Cu_2O Correlative with High-T_c Superconductivity"" J. Phys. Soc. Japan. 60. 3625-3628 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taizo Masumi: ""Nonlinear Optical Phenomena in Cyclotron Resonance of Positive Holes and Electrons in Cu_2O"" J. Phys. Soc. Japan. 60. 3629-3632 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taizo Masumi: ""An Observation of Quantized Step or Clew Temperatures in Superconductive-Conjugate Photoconductivity of Cu_2O"" J. Phys. Soc. Japan. 60. 3633-3636 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taizo Masumi: ""Superconductive-Conjugate Photoconductivity in Host Insulators of the Y_<3-x>-Ba_x-Cu_3-O_z System"" J. Phys. Soc. Japan. 60. 4036-4039 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hidetoshi Minami: ""Novel Temperature Dependence of Photoconductivity in New Semiconductor Bi_2O_3 ; M^<2+>"" J. Phys. Soc. Japan. 60. 4040-4043 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hidetoshi Minami: ""Spectral Photoconductivity of the BaPb_<1-x>Bi_xO_3 System with a Proposal for the Electronic Structure"" Phase Transitions. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Norihisa Ishida: ""DC Field Response of Carriers Bunched in Momentum Space under Crossed Intense Microwave and Magnetic Fields"" Proc. 7th Int. Conf. on Hot Carriers, Nara. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tatsumi Kurosawa: ""Momentum Space Bunching of Carriers in Semiconductors under Crossed Magnetic and Intense Microwave Fields. II. Warped Band Case"" J. Phys. Soc. Japan. 60. 4245-4252 (1991)

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

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Published: 1993-03-16  

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