Control of nuclear spin system and its phase via quantum Hall electron systems

• Project/Area Number: 19204031
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: KOMIYAMA Susumu The University of Tokyo, 大学院・総合文化研究科, 教授 (00153677)
• Research Collaborator: NAKAJIMA Takashi 東京大学, 大学院・総合文化研究科, 助教 (60534344) ; CHEN Jeng-Chung 台湾 国立清華大学, 物理学部, 准教授 ; TOIDA Hiraku 東京大学, 大学院・総合文化研究科・広域化学専攻・相関基礎科学系, 博士課程
• Project Period (FY): 2007 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥46,150,000 (Direct Cost: ¥35,500,000、Indirect Cost: ¥10,650,000); Fiscal Year 2010: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000); Fiscal Year 2009: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000); Fiscal Year 2008: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000); Fiscal Year 2007: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
• Keywords: 量子ホール電子系 / 核スピン / 端状態 / 位相干渉性 / 超微細相互作用 / 量子ホール系 / 超交換相互作用 / 位相制御 / 量子ドット / キャビティーQED / 量子ホール遷移

Research Abstract

Electron-spin eigenstates in quantum Hall edge channels as well as the dynamics of nuclear spin polarization in quantum Hall systems have been clarified by using hyperfine interaction between edge state electrons and nuclear spins. Specific features of electron coherence effects in the systems of quantum point contacts and quantum dots have been clarified. Occurrence of negative differential conductivity in quantum Hall electron systems as well as the existence of thermal bistability in the current-induced breakdown of the quantum Hall states have been experimentally revealed.

Research Products

• [Journal Article] Spin-textured edge states probed by local nuclear spin polarization (2010)
  • Author(s): T.Nakajima, Y.Kobayashi, S.Komiyama
  • Journal Title: Phys. Rev. B 82
  • Peer Reviewed
• [Journal Article] Scanning microscopy of nuclear spin polarization via quantum Hall edge channels (2010)
  • Author(s): T.Nakajima, Y.Kobayashi, S.Komiyama, M.Tsuboi, T.Machida
  • Journal Title: Phys. Rev. B 81
  • Peer Reviewed
• [Journal Article] Lifetime of dissipation-less state of quantum Hall electron systems in the bistable regime (2010)
  • Author(s): T.Nakajima, S.Komiyama
  • Journal Title: Physica E 42 Pages: 1026-1029
  • Peer Reviewed
• [Journal Article] Observation of resonance conductance in a quantum point contact with a tunable channel potential (2010)
  • Author(s): C-S.Wen, J.H.Hsiao, K-T.Lin, T-M.Hong, J.C.Chen, T.Ueda, S.Komiyama
  • Journal Title: Phys.Rev.B Volume: 82
  • Peer Reviewed
• [Journal Article] Spin-textured edge states probed by local nuclear spin polarization (2010)
  • Author(s): T.Nakajima, Y.Kobayashi, S.Komiyama
  • Journal Title: Phys.Rev.B Volume: 82
  • Peer Reviewed
• [Journal Article] Scanning microscopy of nuclear spin polarization via quantum Hall edge channels (2010)
  • Author(s): T. Nakajima, Y. Kobayashi, S. Komiyama, M. Tsuboi, T. Machida
  • Journal Title: Phys.Rev.B 81
  • Peer Reviewed
• [Journal Article] Lifetime of dissipation-less state of quantum Hall electron systems in the bistable regime (2010)
  • Author(s): T. Nakajima, S. Komiyama
  • Journal Title: Physica E 42 Pages: 1026-1029
  • Peer Reviewed
• [Journal Article] Scanning microscopy of nuclear spin polarization via quantum Hall edge channels (2010)
  • Author(s): T.Nakajima, Y.Kobayashi, S.Komiyama, M.Tsuboi, T.Machida
  • Journal Title: Phys.Rev.B 81
  • Peer Reviewed
• [Journal Article] Temperature limitations of quantum Hall far-infrared photodetectors (2010)
  • Author(s): J.C.Chen, J.Zhang, C.C.Chi, T.Ueda, S.Komiyama
  • Journal Title: Jpn.J.Appl.Phys. 49
  • NAID: 40017033704
  • Peer Reviewed
• [Journal Article] Negative differential conductivity of two-dimensional electron gas systems in high magnetic fields (2009)
  • Author(s): J.C.Chen, Y.Tsai, Y.Lin, T.Ueda, S.Komiyama
  • Journal Title: Phys. Rev. B 79
  • Peer Reviewed
• [Journal Article] Negative differential conductivity of two-dimensional electron-gas systems in high magnetic fields (2009)
  • Author(s): J. C. Chen, Y. Tsai, Y. Lin, T. Ueda, S. Komiyama
  • Journal Title: Phys.Rev.B 79
  • Peer Reviewed
• [Journal Article] Transport properties of a quantum dot in Quantum Hall regimes probed by a single-electron transistor (2009)
  • Author(s): J.C.Chen, Ming-Yang Li, T.Ueda, S.Komiyama
  • Journal Title: Appl.Phys.Lett. 94
  • Peer Reviewed
• [Journal Article] Negative differential conductivity of two-dimensional electron-gas systems in high magnetic fields (2009)
  • Author(s): J. C. Chen, S. Komiyama, etc.
  • Journal Title: PHYSICAL REVIEW B 79
  • Peer Reviewed
• [Journal Article] Effects of impurity scattering on the quantized conducatance of a quasi-one-dimensional quantum wire (2009)
  • Author(s): J. C. Chen, S. Komiyama, etc.
  • Journal Title: APPLIED PHYSICS LETTERS 94
  • Peer Reviewed
• [Journal Article] System-Size Dependence of Quantum Hall Transitions (2007)
  • Author(s): T.Nakajima, T.Ueda, S.Komiyama
  • Journal Title: J. Phys. Soc. Jpn 76
  • NAID: 110006418606
  • Peer Reviewed
• [Journal Article] System-Size Dependence of Quantum Hall Transitions (2007)
  • Author(s): T. Nakajima, T. Ueda, S. Komiyama
  • Journal Title: J.Phys.Soc.Jpn. 76
  • NAID: 110006418606
  • Peer Reviewed
• [Journal Article] System-Size Dependence of Quantum Hall Transitions (2007)
  • Author(s): T.Nakajima, T.Ueda, S.Komiyama
  • Journal Title: J.Phys.Soc.Jpn 76 Pages: 947031-6
  • NAID: 110006418606
  • Peer Reviewed
• [Journal Article] Quantum Hall transitions in mesoscopic devices (2007)
  • Author(s): T.Nakajima, T.Ueda, S.Komiyama
  • Journal Title: Physica E 40 Pages: 1285-1287
  • Peer Reviewed
• [Presentation] 半導体量子ドットによるCirucuitQEDの研究II (2011)
  • Author(s): 樋田啓
  • Organizer: 日本物理学会年次大会(地震により大会は中止.要旨集をもって発表とする)
  • Place of Presentation: (新潟大学)新潟
  • Year and Date: 2011-03-28
• [Presentation] 核スピン偏極緩和時間の抵抗検出法における拡散の寄与 (2010)
  • Author(s): 中島峻
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: (大阪府立大学)大阪
  • Year and Date: 2010-09-24
• [Presentation] 半導体量子ドットによるCirucuitQEDの研究 (2010)
  • Author(s): 田啓
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: (大阪府立大学)大阪
  • Year and Date: 2010-09-24
• [Presentation] Nano-scale probing of edge spin states via nuclear spin polarization (2010)
  • Author(s): T.Nakajima
  • Organizer: 30th International Conference on the Physics of Semiconductors(ICPS 30)
  • Place of Presentation: (COEX)Seoul,Korea
  • Year and Date: 2010-06-29
• [Presentation] 量子ホール効果崩壊現象のおける熱双安定性 (2010)
  • Author(s): 小宮山進
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学津島キャンパス(岡山)
  • Year and Date: 2010-03-21
• [Presentation] 量子ホール効果崩壊現象のおける熱双安定性 (2010)
  • Author(s): 小宮山進、中島峻
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-21
• [Presentation] 局所核スピン偏極の緩和測定によるSpin-Textured Edge状態の検出 (2010)
  • Author(s): 中島峻、小林泰子、小宮山進
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-20
• [Presentation] Spin States in Edge Channels Probed via Relaxation of Local Nuclear Polarization (2010)
  • Author(s): T.Nakajima
  • Organizer: International Symposium on Quantum Nanostructures and Spin-related Phenomena (QNSP2010)
  • Place of Presentation: 東京大学駒場キャンパス数理研究科大講義室(東京)
  • Year and Date: 2010-03-09
• [Presentation] Spin States in Edge Channels Probed via Relaxation of Local Nuclear Polarization (2010)
  • Author(s): T. Nakajima, Y. Kobayashi, S. Komiyama
  • Organizer: International Symposium on Quantum Nanostructures and Spin-related Phenomena (QNSP2010)
  • Place of Presentation: Komaba, Japan
  • Year and Date: 2010-03-09
• [Presentation] Spin States in Edge Channels Probed via Relaxation of Local Nuclear Polarization (2010)
  • Author(s): T.Nakajima, Y.Kobayashi, S.Komiyama
  • Organizer: International Symposium on Quantum Nanostructures and Spin-related Phenomena(QNSP2010)
  • Place of Presentation: 東京大学駒場キャンパス数理研究科大講義室(東京)
  • Year and Date: 2010-03-09
• [Presentation] 量子ホールエッジチャネルによる局所核スピン偏極の生成と減衰 (2009)
  • Author(s): 中島峻、小林泰子、坪井理広、小宮山進、町田友樹
  • Organizer: 第14回半導体スピン工学の基礎と応用(PASPS-14)
  • Place of Presentation: 慶應義塾大学日吉キャンパス(神奈川)
  • Year and Date: 2009-12-21
• [Presentation] Lifetime of dissipation-less state of quantum Hall electron systems in the bistable regime (2009)
  • Author(s): T.Nakajima
  • Organizer: 18th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-18)
  • Place of Presentation: 神戸コンベンションセンター(兵庫)
  • Year and Date: 2009-07-20
• [Presentation] Lifetime of dissipation-less state of quantum Hall electron systems in the bistable (2009)
  • Author(s): T.Nakajima, S.Komiyama
  • Organizer: 18th International Conference on the Electronic Properties of Two-Dimensional Systems(EP2DS-18)
  • Place of Presentation: 神戸コンベンションセンター(兵庫)
  • Year and Date: 2009-07-20
• [Presentation] Current dependent dephasing in an Aharonov-Bohm Interferometer (2009)
  • Author(s): K-Tlin, Y. Lin, J. C. Chen, T. Ueda, S. Komiyama
  • Organizer: 2009 APS March Meeting
  • Place of Presentation: Pittsburgh(USA)
  • Year and Date: 2009-03-16
• [Presentation] System-size dependent quantum Hall transition (2007)
  • Author(s): T.Nakajima
  • Organizer: 17th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-17)
  • Place of Presentation: Genova,(Italy)
  • Year and Date: 2007-07-16
• [Presentation] System-size dependent quantum Hall transition (2007)
  • Author(s): T. Nakajma, T. Ueda, S. Komiyama
  • Organizer: EP2DS-17(17th International Conference on the Electronic Properties of Two-Dimensional Systems)
  • Place of Presentation: Genova,Italy
• [Remarks]
  • URL: http://dbs.c.u-tokyo.ac.jp/~komiyama/
• [Remarks]
  • URL: http://maildbs.c.u-tokyo.ac.jp/~komiyama/
• [Remarks] ホームページ
  • URL: http://dbs.c.u-tokyo.ac.jp/~komiyama/
• [Remarks]
  • URL: http://maildbs.c.u-tokyo.ac.jp/~komiyama/