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Inter-dot interaction and photo-conductivity in quantum dot ensemble.

Research Project

Project/Area Number 09831004
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 極微細構造工学
Research InstitutionKonan University

Principal Investigator

SUGIMURA Akira  Konan University, Faculty of Science, Professor, 理学部, 教授 (30278791)

Co-Investigator(Kenkyū-buntansha) パブロ バッカロ  ATR環境適応通信研究所, 研究員
FUJITA Kazuhisa  ATR Adaptive Communication Research Labs., Senior Researcher, 主任研究員
UMEZU Ikuro  Konan University, Faculty of Science, Asociate Professor, 理学部, 助教授 (30203582)
VACCARO Publo o  ATR Adaptive Communication Research Labs., Researcher
ハ゜ブロ バッカロ  ATR環境適応通信研究所, 研究員
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsquantum dot / inter-dot interaction / coupling / photo-conductivity / photoluminescence / strong correlation / InGaAs / dot density / 自己形成 / GaAs / トンネル結合 / ドット間結合 / 高密度ドット / ImAs / 非対称スペクトル / 磁気スピン / 電子相関
Research Abstract

InAs/GaAs quantum dot ensembles with different dot densities were prepared self-consistently using Stranski-Krastanov growth mode. Photoluminescence spectrum measured at 12K showed asymmetric shape indicating longer tail at lower energy side when the dot density was high enough. We measured the dot size distribution by using atomic force microscope. Although the size of each dot is not uniform, inhomogeneous broadening of the quantum levels due to this size distribution is found to be unable to explain the experimentally observed asymmetric spectrum. We theoretically showed that the quantum states of the three-dot system are split into asymmetric levels, one bonding state and two anti-bonding states, when the inter-dot coupling is introduced. Based on this idea, we numerically calculated the coupled electronic states of the randomly distributed many dot system by directly diagonalizing the coupled wave equations. Since the result showed asymmetric shape with longer tail at lower energy side, the experimentally observed asymmetric spectrum can be attributed to the inter-dot coupling. In addition, we investigated the photo-conductive properties of the samples. We observed nonlinear current-voltage characteristics with a peak in differential registance when the dot density is high enough. The peak position moves as the illuminated light intensity is changed. These experimental results suggest that the nonlinear electron transport is caused by the Coulomb repulsion of the two electrons sited on a quantum dot.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (36 results)

All Other

All Publications (36 results)

  • [Publications] J. Sakai and A. Sugimura: "Temporal propagation of electron wave in a periodic structure with finite length"Jpn J. Appl. Phys.. 36. 5382-5392 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Umezu et al.: "Temperature dependent photoluminescence of silicon nano crystallites prepared by ambient pulsed laser ablation"Material Research Society Symposium Prdeedings. 486. 219-223 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] A. Sugimura et al.: "Structure parameters for electron spin ordering in InGaAs/GaAs coupled quantum dot systems"Abstract of Material Research Society Meeting. -. 85-86 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] A. Sugimura et al.: "In-plane electronic coupling in self-organized quantum dot ensemble"Proc. 24th International Conf. Physics of Semiconductors. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Umezu et al.: "Efficient photoluminescence from a-Si : H film prepared by reactive RF sputtering"Proc. 24th International Conf. Physics of Semiconductors. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] P. O. Vaccaro et al.: "Nane-oxidation of vanadium thin film using atomic force microscope"Journal of Material Science Letters. 17. 1941-1943 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Umezu et al.: "A Comparative study of the photoluminescence properties of a-SiO_2 : H film and silicon nano crystallites"Journal of Non-Crystalline Solids. 印刷中. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Umezu et al.: "Effects of thermal processing on photoluminescence of Si nano crystallites prepared by pulsed laser ablation"Proc. 5th Int. Symp. Quantum Confinement Names true turis. 98-19. 40-48 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Umezu et al.: "Effects of thermal processes on photoluminescence of Si nano crystallites prepared by pulsed laser ablation"J. Appl. Phys.. 84. 6448-6450 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 只政逸志 他: "POS法を用いた薄膜中の欠陥の深さ方向分布測定法"論文集 光物性研究会'97. -. 161-164 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. Sakai and A. sugimura: ""Temporal propagation of electron wave in a periodic structure with finite length""Jpn. J. Appl Phys.. vol.36. 5382-5392 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Umezu et al.: ""Temperature dependent photoluminescence of silicon monocrystallites prepared by ambient pulsed laser ablation""Material Research Society Symposium Proceedings. 486. 219-223 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] A Sugimura et al.: ""Structure parameters for electron spin ordering in InGaAs/GaAs coupled quantum dot systems""Abstract of Material Research Society Meeting. 85-86 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] A Sugimura et al.: ""In-plane electronic Coupling in self-organized quantum dot ensemble""Proc. 24th Int. Conf. Physics of Semiconductors. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I Umezu et al.: ""Efficient photoluminescence from u-Si : H film prepared by reactive RF sputtering""Proc. 24th Int. Conf. Physics of Semiconductors. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] P. O. Vaccaro et al.: ""Nanooxydation of vanadium thin film using atomic force microscope""J. Material Science Letters. vol.17. 1941-1943 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I Umezu et al.: ""A comparative study of the photoluminescence properties of a SiOx : H film and silicon monocrystals""J Noncrystalline Solids. (to be published). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I Umezu et al.: ""Effects of thermal processing on photoluminescence of Si monocrystallites prepared by pulsed laser ablation""Proc. 5th Int. Symp. Quantum Confinement Nanostructures. vol.98-19. 40-48 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Umezu et al.: ""Effects of thermal processes on photoluminescence of Si monocrystallites prepared by pulsed laser ablation""J. Appl. Phys.. vol.84. 6448-6450 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I.Umezu et al: "A comparative study of the photoluminescence properties of u-SiO_2 : H film and silicon nanocrystallites"Journal of Non Crystalline Solids. (印刷中). 1-5 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Kataura et al.: "Optical properties of single wall carbon nanotules"Synthetes Metals. 103. 2555-2558 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] I.Umezu et al.: "Effects of thermal processing on photoluminescence of Si nanocrystallites prepared by pulsed laser ablatich"Proe 5th Int.symp.Quention Confinement Nanostuctares. 98-19. 40-48 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Kataura et al: "Optical absorption and resonance paman Acattering of Carbon nanotubes"Electronic propertees of Novel Materials. 328-332 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Oyoshi et al.: "Strucure optical absorption and electronic steetes of Zn ion implanted and subseqeently connecled sol gel anatase TeO_2 felms"Nuclear Instruments and Methods in Phipies Releard B. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] I.Umezu et.al.: "Temperature dependent phatoluminescenie of Si nano crystallites prepared by inert gas ambient pulued laser ablation" Material Research Society Symposium Proceedings. 486. 219-223 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] I Umezu et.al.: "Effects of Thermal processes on photoluminer cence of Si nano crystallites prepared by pulsed laser ablation" J.Appl.Phys.84. 6448-6450 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] A.Sugimura et.al.: "In plame eleetronic coupling in self organized quantum lot ensemble" Proc.24th International Conf.Physics of Semiconducters. (印刷中).

    • Related Report
      1998 Annual Research Report
  • [Publications] I.Umezu et.al.: "Efficient photoluminescence from a-Si:H film prepared by reacture RF sputtering" Proc.24th Int.Conf.Physics of Semiconductors. (印刷中).

    • Related Report
      1998 Annual Research Report
  • [Publications] P.O.Vaccaro et.al.: "Nano oxidation of vanadium Their film using atomic force microscope" Journal of Material Science Letters. 17. 1941-1943 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] I.Umezu et.al.: "Effects of thermal processing on photoluminescence of Si nanocriptallited prepared by pulsed laser ablation" Proc.5th Int.Symp.Quantum Confenement Nano-structures. (印刷中). 40-48

    • Related Report
      1998 Annual Research Report
  • [Publications] J. Sakai and A. Sugimura: "Temporal Propagation of Electron Wave in a Periodic Structure with Finite Length" Japanese Journal of Applied Physics. 36. 5382-5392 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] I. Umezu et. al.: "Temperature-Dependent Photoluminescence of Silicon Nanocrystallites pregared by Gas Ambient Pulsed Laser Ablation" Symposium Proceedings of the 1997 MRS Fall Meeting. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] I. Umezu et. al.: "A Study of Interface state Density between a-SiH and Insulating Layer in Terms of Plasma Surface Reaction" Journal of Non-Crystalline Solids. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] A. Sugimura et. al.: "Structure Parameters for Electron Spin Ordering in InGaAs/GaAs Coupled Quantum Dot Systems" Abstract of Material Research Society Meeting. 85-86 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] I. Umezu et. al.: "Temperature-Dependent Photoluminescence of Silicon Nanocrystallites Prepared by Inert Gas Ambient Pulsed Laser Ablation" Abstract of Material Research Society Meeting. 200-201 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 只政逸志,梅津郁朗杉村陽: "PDS法を用いた薄膜中の欠陥の深さ方向分布測定法" 論文集光物性研究会'97. 161-164 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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