High sensitive detection of decoherence processes of exciton complexes in single semiconductor quantum dots

• Project/Area Number: 19740175
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics I
• Research Institution: Shizuoka University (2008); University of Tsukuba (2007)
• Principal Investigator: BANDO Kazuki Shizuoka University, 理学部, 助教 (50344867)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,560,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥360,000); Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2007: ¥2,000,000 (Direct Cost: ¥2,000,000)
• Keywords: 励起子 / 量子ドット / コヒーレンス

Research Abstract

フーリエ分光法によって半導体単一量子ドット中の励起子の位相緩和過程を調べることに成功した。これまで励起子位相緩和を支配するものはフォノンであると考えられてきたが、本研究ではフォノンとは別に周囲にトラップされた余剰電荷がフォノンよりも時間スケールの長い位相緩和をもたらすことを明らかにした。さらに、フォノンと余剰電荷による位相緩和の競合により、温度上昇で一時的にスペクトル線幅が狭くなる場合があることを見出した。

Research Products

• [Journal Article] Narrowing of exciton linewidth of a quantum dot with increasing temperature (2009)
  • Author(s): K. Bando and Y. Masumoto
  • Journal Title: physica status solidi(c) 6 Pages: 57-60
  • Peer Reviewed
• [Journal Article] harrowing of exciton linewidth of a quantum dot with increasing temperature (2009)
  • Author(s): Kazuki Bando
  • Journal Title: physica status solidi c 6 Pages: 57-60
  • Peer Reviewed
• [Journal Article] Optical selection rule for the lower Davydov excitons in co-oligomer single crystals (2008)
  • Author(s): K. Bando, T. Nakamura, S. Fujiwara, Y. Masumoto, F. Sasaki, S. Kobayashi, Y. Shimoi, and S. Hotta
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] Interferometric spectroscopy for excitons in InP single quantum dots (2008)
  • Author(s): K. Bando and Y. Masumoto
  • Journal Title: Journal of Luminescence 128 Pages: 855-857
  • Peer Reviewed
• [Journal Article] Interferometric spectroscopy for excitons in InP single quantum dots (2008)
  • Author(s): Kazuki Bando
  • Journal Title: Journal of Luminescence 128 Pages: 855-857
  • Peer Reviewed
• [Journal Article] Microdisk and Microring lasers of Thiophene-Phenylene Co-oligomers embedded in Si/SiO2 substrates (2007)
  • Author(s): F. Sasaki, S. Kobayashi, S. Haraichi, S. Fujiwara, K. Bando, Y. Masumoto, and S. Hotta
  • Journal Title: Advanced Materials 19 Pages: 3653-3655
  • Peer Reviewed
• [Journal Article] Laser oscillations of whispering gallery modes in thiophene/phenylene co-oligomer microrings (2007)
  • Author(s): S. Fujiwara, K. Bando, Y. Masumoto, F. Sasaki, S. Kobayashi, S. Haraichi, and S. Hotta
  • Journal Title: Applied Physics Letters 91
  • NAID: 120007139023
  • Peer Reviewed
• [Journal Article] Optical anisotropy of excitons and biexcitons in InP quantum dots (2007)
  • Author(s): Y. Masumoto, K. Mizuochi, K. Bando, and Y. Karasuyama
  • Journal Title: Journal of Luminescence 122 Pages: 424-426
  • Peer Reviewed
• [Presentation] Narrowing of exciton linewidth of a quantum dot with increasing temperature Interferometric Spectroscopy for Excitons in InP Single Quantum Dots (2008)
  • Author(s): K. Bando and Y. Masumoto
  • Organizer: 8th International Conference on Excitonic Processes in Condensed Matter
  • Place of Presentation: Kyoto, Japan
• [Presentation] 半導体量子ドットにおける励起子線幅の温度上昇による先鋭化 (2008)
  • Author(s): 阪東一毅, 舛本泰章
  • Organizer: 第55回応用物理学関係連合講演会2008年春季
  • Place of Presentation: 日本大学理工学部船橋キャンパス
• [Presentation] Narrowing of exciton linewidth of a quantum dot with increasing temperature (2008)
  • Author(s): Kazuki. Bando
  • Organizer: 8^<th> International Conference on Excitonic Processes in Condensed Matter
  • Place of Presentation: Kyoto, Japan
• [Presentation] Interferometric Spectroscopy for Excitons in InP Single Quantum Dotsz (2007)
  • Author(s): K. Bando and Y. Masumoto
  • Organizer: 16th International Conference on Dynamicl Excited States of Solids
  • Place of Presentation: Segovia, Spain
• [Presentation] 単一InP 量子ドットにおける励起子位相緩和過程の非指数関数的減衰 (2007)
  • Author(s): 阪東一毅, 舛本泰章
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学札幌キャンパス
• [Presentation] 単一InP単一量子ドットにおいて非指数関数的減衰を示す励起子位相緩和過程 (2007)
  • Author(s): 阪東一毅, 舛本泰章
  • Organizer: 第68回応用物理学会学術講演会2007年秋季
  • Place of Presentation: 北海道工業大学
• [Presentation] Si基板上の埋め込み型(チオフェン/フェニレン)コオリゴマーマイクロレーザー (2007)
  • Author(s): 佐々木史雄, 小林俊介, 原市 聡, 藤原聖士, 井門靖樹, 阪東一毅, 舛本泰章, 堀田 収
  • Organizer: 第68回応用物理学会学術講演会2007年秋季
  • Place of Presentation: 北海道工業大学