• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Femtosecond relaxation dynamics of excitons localized by disorder in semiconductors

Research Project

Project/Area Number 63460021
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionHokkaido University

Principal Investigator

MINAMI Fujio  Hokkaido University, Research Institute of Applied Electricty, Associate Professor, 応用電気研究所, 助教授 (30200083)

Co-Investigator(Kenkyū-buntansha) ASAKA Shuji  Hokkaido University, Research Institute of Applied Electricity, Instructor, 応用電気研究所, 助手 (00167876)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1988: ¥6,800,000 (Direct Cost: ¥6,800,000)
KeywordsFemtosecond Spectroscopy / Localized exciton / Phase relaxation / Diamond anvil cell / GaAs / AlAs superlattices / Temporally Incoherent light / Layered compound / スェムト秒分光 / ダイヤモンドアンヴィル / GaAs@AlAs超格子 / インコヒーレントパルス分光 / GaAs
Research Abstract

1) We made a passively mode-locked dye laser system. The dye laser produces a train of 100 fs pulses at the rate of 100 MHz. The wavelength tuning range is 580-620 nm.
2) The phase relaxation time of the exciton in GaSe was measured by using temperature-dependent photon echo method. It is found that the optical dephasing is caused by phonon scattering above 30 K.
3) A close correlation was found between the radiative lifetime and the phase correlation time of the free excitons in GaSe. This result gives a direct experimental proof of the recent theoretical prediction.
4) We made two different hole burning experiments in the free exciton line in GaSe: pulse propagation delay and pump-probe experiments. Both results support arguments for partial exciton localization by stacking disorder.
5) We proposed two new methods to investigate femtosecond processes: pump-probe and upconversion methods using temporally incoherent lights.
6) Temporal behavior of hot carriers in CdSe was investigated with subpicosecond accuracy, by using a novel pump-probe technique. in which the self-phase modulation effect in an optical fiber is utilized to extend the spectral width of the probe pulse. Pump-induced changes is explained by the formation of an electron-hole plasma and a succeeding thermal relaxation of the plasma.
7) Photoluminescence spectra of short-period GaAs/AlAs superlattices were studied as a function of hydrostatic and uniaxial pressure at 20 K. It is found that lowest excited state is an indirect exciotns at Xz.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Fujio Minami: "Similarity of exciton dynamics in GaAs/AlAs short-period superlattice and alloy" Proceedings of the International Conference on Physisc of Semiconductors. 19. 411-414 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Hole bruning of free exciton line in GaSe" Ultrafast Phenomena. 6. 229-232 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Shuji Asaka: "Ultrafast fluorometry using temporally incoherent light" Ultrafast Phenomena. 6. 375-377 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Ultrafast two-laser pump-probe experiment using temporally incoherent lights" Applied Physics Letters. 54. 978-980 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Pressure effect on indirect excitons in ultra-thin GaAs-AlAs superlattice" Semiconductor science and technology. 4. 265-266 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 南不二雄: "GaAs/AlAs短周期超格子中の間接励起子" 固体物理. 24. 482-488 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Population and phase relaxations of quasi-two dimensional excitons in Gase:Femtosecond photon echoes and luminescence decay measurements" Journal of Luminescence. 45. 409-411 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Atsushi Hasegawa: "Femtosecond relaxation dynamics of hot carriers in CdSe" Journal of Luminescence. 45. 192-193 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "X-I'scattering in short-period GaAs/AlAs superlattices" Journal of Luminescence(投稿予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Similarity of exciton dynamics in GaAs/AlAs short-period superlattice and alloy" Proc. 19th Int. Conf. on Physics of Semiconductors (Warsaw, 1988) p.411.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Hole burning of free exciton line in GaSe" "Ultrafast Phenomena VI" (Springer, 1988) p.229.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Shuji Asaka: "Ultrafast fluorometry using temporally incoherent light" "Ultrafast Phenomena VI" (Springer, 1988) p.375.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Ultrafast two-laser pump-probe experiment using temporally incoherent lights" Appl. Phys. Lett. 54 978 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Pressure effects on indirect excitons in AlAs/GaAs ultra-thin superlattice" Semicond. Sci. Tech. 4 265 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Indirect excitons in GaAs/AlAs short-period superlattices" Solid State Physics (Kotai Butsuri) 24 482 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Population and phase relaxations of quasi-two dimensional excitons in GaSe: Femtosecond photon echoes and luminescence decay measurements" J. Luminescence 45 409 (1990).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Atsushi Hasegawa: "Femtosecond relaxation dynamics of hot carriers in CdSe" J. Luminescence 45 192 (1990).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "X-GAMMA scattering in short-period GaAs/AlAs superlattices" J. Luminescence.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Fujio Minami: "Ultrafast two-laser pump-probe experiment using temporally incoherent lights" Applied Physics Letters. 54. 978-980 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Fujio Minami: "Pressure effect on indirect excitons in ultra-thin GaAs-AlAs superlattice" Semiconductor science and technology. 4. 265-266 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 南不二雄: "GaAs/AlAs短周期超格子中の間接励起子" 固体物理. 24. 482-488 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Fujio Minami: "Population and phase relaxations of quasi-two dimensional excitons in GaSe:Femtosecond photon echoes and luminescence decay measurements" Journal of Luminescence. 45. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Atushi Hasegawa: "Femtosecond relaxation dynamics of hot carriers in CdSe" Journal of Luminescence. 45. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Fujio Minami: "X-Γ scattering in short-period GaAs/AlAs superlattices" Journal of Luminescence.

    • Related Report
      1989 Annual Research Report
  • [Publications] Fujio,Minami: Ultrafast Phenomena. 6. 229-232 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Shuuji,Asaka: Ultrafast Phenomena. 6. 375-377 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fujio,Minami: Proceedings of the International Conference on Physics of Semiconductors. 19. (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fujio,Minami: Applied Physics Letters. 54. 978-980 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fujio,Minami: Semiconductor science and technology. 4. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fujio,Minami: Journal of Luminescence.

    • Related Report
      1988 Annual Research Report

URL: 

Published: 1988-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi