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Experimental Study on Quantum Coherence in Solids

Research Project

Project/Area Number 13304029
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionThe University of Tokyo

Principal Investigator

KATSUMOTO Shingo  The University of Tokyo, Institute for Solid State Physics, Professor, 物性研究所, 教授 (10185829)

Co-Investigator(Kenkyū-buntansha) KOBAYASHI Kensuke  The University of Tokyo, Institute for Solid State Physics, Research Associate, 物性研究所, 助手 (10302803)
ENDO Akira  The University of Tokyo, Institute for Solid State Physics, Research Associate, 物性研究所, 助手 (20260515)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥41,080,000 (Direct Cost: ¥31,600,000、Indirect Cost: ¥9,480,000)
Fiscal Year 2003: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2002: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
Fiscal Year 2001: ¥22,490,000 (Direct Cost: ¥17,300,000、Indirect Cost: ¥5,190,000)
Keywordsquantum dot / quantum decoherence / spin flip / Kondo effect / Fano effect / Coulomb peak / quantum anti-dot / edge state / ファノ効果 / クーロンピーク / 量子コヒーレンス / デコヒーレンス / 近藤状態 / スピン偏極キャリア / Aharonov-Bohm効果 / 単電子トンネリング
Research Abstract

We have observed, for the first time, clear sign of the Fano effect, which is a consequence of phase-shift and interference in a combined system of a quantum dot and a quantum ring. The observation leads to new knowledge of quantum coherence, e.g., the nature of Fano parameter. We have also applied this effect to investigate various problems on quantum coherence. For example, we have clearly observed electrostatic control of quantum phase and found a new theoretical method to treat thermal broadening of the quantum phase, which is applied to analyze experimental results. Especially, we have given a partial answer to a long standing problem of "in-phase Coulomb peaks". We further found the existence of strongly coupled states in quantum dots and multi-level transport through an ordinal resonant tunneling and co-tunneling through a strongly coupled state results in Fano interference in a quantum dot without any outer reference arm. External magnetic field causes focusing of strongly coupled states and smooth transition to outmost edge states is observed.
We have investigated the relation between the spin states in quantum dots and the quantum coherence by a quantum ring structure. We have found that the spin scattering causes quantum decoherence through the formation of quantum entangled states between a local spin and a spin of traversing electron.
We have shown that coherent control of electronic path through magnetic decoration on two-dimensional electrons. We have found a new quantum oscillation in magnetoresistance of quantum anti-dot systems.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (64 results)

All Other

All Publications (64 results)

  • [Publications] S.Katsumoto, K.Kobayashi, H.Aikawa, A.Sano, Y.Iye: "Quantum coherence in quantum dot - Aharonov-Bohm ring hybrid systems"Superlattices and Microstructures. in press. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, A.Sano, S.Katsumoto Y.Iye: "Mesoscopic Fano effect in a quantum dot embedded in an Aharonov-Bohm ring"Physical Review B. 68. 235304.1-235304.6 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Aikawa, K.Kobayashi, S.Katsumoto, Y.Iye: "Observation of "Partial Coherence" in an Aharonov-Bohm Interferometer with a Quantum Dot"Physical Review Letters. 92. 176802.1-176802.4 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Aikawa, K.Kobayashi, S.Katsumoto, Y.Iye: "Spin-flip Process and Quantum Decoherence in a Quantum Dot"Physica E. 22. 474-477 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 相川恒, 小林研介, 佐野徹之, 勝本信吾, 家泰弘: "量子ドットにおけるスピン絡み合いとコヒーレンス/デコヒーレンス"固体物理. 38. 745-754 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Mesoscopic Fano Effect through a QuantumDot in an Aharonov-Bohm Ring"Physica E. 22. 468-473 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Tunable Fano system : a quantum dot embedded in an Aharonov-Bohmring"Physica E. 18. 56-61 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Tuning of the Fano Effect through Quantum Dot in an Aharonov-Bohm Interferometer"Physica Review Letters. 88. 256808.1-256808.4 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Probe-Configuration-Dependent Decoherence in an Aharonov-Bohm Ring"Journal of the Physical Society of Japan. 71. 2094-2097 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 小林研介, 相川恒, 勝本信吾, 家泰弘: "量子複合系の物理:メゾスコピックFano効果"固体物理. 38. 29-40 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Reduction of quantum decoherence in non-local resistance measurement"Microelectronic Engineering. 63. 752-789 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Observation of an Enhanced Aharonov-Bohm effect"Journal of Physics and Chemistry of Solids. 63. 1301-1305 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Aikawa, K.Kobayashi, S.Katsumoto, Y.Iye: "Suppression of Quantum Decoherence in Non-Local Resistane Measuremen"Journal of the Physical Society of Japan. 72 suppl.A. 5-6 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 相川恒, 小林研介, 中西毅: "量子ドットの電子状態と透過波の位相シフト"日本物理学会誌. 印刷中. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Transport in Two-Dimensional Electron Gas with Isolated Magnetic Barriers"Journal of the Physical Society of Japan. 74. 543-549 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Magnetotransport in 2DEG with Magnetic Barriers"Physica E. 12. 224-228 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Transport in a two-dimensional electron-gas narrow channel with a magnetic field gradient"Physical Review B. 69. 153304.1-153304.4 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Transport in Ferromagnet/Semiconductor 2DEG Hybrid Network Structure"Physica E. 22. 356-348 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Ueki, A.Endo, S.Katsumoto, Y.Iye: "Quantum Oscillation and Decoherence in Triangular Antidot Lattice"Physica E. 22. 365-368 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 勝本信吾: "メゾスコピック系"朝倉書店,東京. 197 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 勝本信吾: "実験・人工量子力学"岩波書店,東京. 82 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 勝本信吾: "ポケットに電磁気を"丸善,東京. 215 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Katsumoto, K.Kobayashi, H.Aikawa, A.Sano, Y.Iye: "Quantum coherence in quantum dot -Aharonov-Bohm ring hybrid system"Superlattices and Microstructures. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, A.Sano, S.Katsumoto, Y.Iye: "Mesoscopic Fano effect in a quantum dot embedded in an Aharonov-Bohm ring"Physical Review B. vol.68. 235034-1-235034-6 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Aikawa, K.Kobayashi, S.Katsumoto, Y.Iye: "Observation of "Partial Coherence" in an Aharonov-Bohm Interferometer with a Quantum Dots"Physical Review Letters. vol.92. 176802-1-176802-4 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Aikawa, K.Kobayashi, S.Katsumoto, Y.Iye: "Spin-flip Process and Quantum Decoherence in a Quantum Dot"Physica E. vol.22. 474-477 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Aikawa, K.Kobayashi, A.Sano, S.Katsumoto, Y.Iye: "Spin entanglement in quantum dots -relation with quantum coherence/decoherence"Kotai-Butsuri (Solid State Physics). vol.38. 745-754 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Mesoscopic Fano Effect through a QuantumDot in an Aharonov-Bohm Ring"Physica E. vol.22. 468-473 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tunable H.Aikawa, S.Katsumoto, Y.Iye: "Tunable Fano system a quantum dot embedded in an Aharonov-Bohmring"Physica E. vol.18. 56-61 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Tuning of the Fano Effect through Quantum Dot in an Aharonov-Bohm Interferometer"Physica Review Letters. vol.88. 256808-1-256808-4 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Probe-Configuration-Dependent Decoherence in an Aharonov-Bohm Ring"Journal of the Physical Society of Japan. vol.71. 2094-2097 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Physics of a Quantum Complex System : Mesoscopic Fano Effect"Kotai Butsuri (Solid State Physics). vol.38. 29-40 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Reduction of quantum decoherence in non-local resistance measurement"Microelectronics Engineering. vol.63. 752-789 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Observation of an Enhanced Aharonov-Bohm effect"Journal of Physics and Chemistry of Solids. vol.63. 1301-1305 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Aikawa, K.Kobayashi, S.Katsumoto, Y.Iye: "Suppression of Quantum Decoherence in Non-Local Resistance Measuremen"Journal of the Physical Society of Japan. vol.72, supplement A. 5-6 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Aikawa, K.Kobayashi, T.Nakanishi: "Electronic States in Quantum Dots and Phase Shift of Transparent Wave"Butsuri (issued by the Physical Society of Japan). (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Transport in Two-Dimensional Electron Gas with Isolated Magnetic Barriers"Journal of the Physical Society of Japan. vol.74. 543-549 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Magnetotransport in 2DEG with Magnetic Barriers"Physica E. vol.12. 224-228 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Transport in a two-dimensional electron-gas narrow channel with a magnetic field gradient"Physical Review B. vol.69. 153304-1-153304-4

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Transport in Ferromagnet/Semiconductor 2DEG Hybrid Network Structure"Physica E. vol.22. 345-348 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Ueki, A.Endo, S.Katsumoto, Y.Iye: "Quantum Oscillation and Decoherence in Triangular Antidot Lattice"Physica E. vol.22. 365-368 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Katsumoto: "Mesoscopic System"Asakura-shoten, Tokyo. 197 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Katsumoto: "Experiments in Artificial Quantum System"Iwanami-shoten, Tokyo. 82 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Katsumoto: "A Pocket Full of Electromagnetism"Maruzen, Tokyo. 215 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Katsumoto, K.Kobayashi, H.Aikawa, A.Sano, Y.Iye: "Quantum coherence in quantum dot - Aharonov-Bohm ring hybrid systems"Superlattices and Microstructures. (in press).

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikawa, A.Sano, S.Katsumoto, Y.Iye: "Mesoscopic Fano effect in a quantum dot embedded in an Aharonov-Bohm ring"Physical Review B. 68. 235304.1-235304.6 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Aikawa, K.Kobayashi, S.Katsumoto, Y.Iye: "Observation of "Partial Coherence" in an Aharonov-Bohm Interferometer with a Quantum Dot"Physical Review Letters. (to be published).

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Aikawa, K.Kobayashi, S.Katsumoto, Y.Iye: "Spin-flip Process and Quantum Decoherence in a Quantum Dot"Physica E. (in press).

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Mesoscopic Fano Effect through a QuantumDot in an Aharonov-Bohm Ring"Physica E. (in press).

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Tunable Fano system : a quantum dot embedded in an Aharonov-Bohmring"Physica E. 18. 56-61 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Tuning of the Fano Effect through Quantum Dot in an Aharonov-Bohm Interferometer"Physical Review Letters. 88. 256806-1-256806-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Observation of an enhanced Aharonov-Bohm effect"Journal of Physics and Chemistry of Solids. 63. 1301-1305 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Hayashi, Y.Hashimoto, S.Katsumoto, Y.Iye: "Metal-insulator transition in (Ga, Mn)As"Journal of Physics and Chemistry of Solids. 63. 1315-1318 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Probe-Configuration-Dependent Decoherence in an Aharonov-Bohm Ring"Journal of the Physical Society of Japan. 71. 2094-2097 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 小林研介, 相川恒, 勝本信吾, 家泰弘: "量子複合系の物理:メゾスコピックFano効果"固体物理. 38. 29-40 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Hirakawa, S.Katsumoto, T.Hayashi, Y.Hashimoto, Y.Iye: "Double-exchange-like interaction in Ga_<1-x>Mn_xAs investigated by infrared absorption spectroscopy"Physical Review B. 65. 193312-1-193312-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 相川恒: "量子ドット・Aharonov-Bohmリング複合系における電子のコヒーレンス"物性研究. 78. 752-789 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikmwa, S.Katsumoto, Y.Iye: "Reduction of quantum decoherence in non-local resistance measurement"Microelectronic Engineering. 63. 53-56 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 勝本信吾: "メゾスコピック系"朝倉書店,東京. 197 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 勝本信吾: "ポケットに電磁気を"丸善,東京. 215 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Suppression of decoherence in an Aharonov-Bohm ring"Microelectronic Engineering. (to be published).

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Kobayashi, H.Aikawa, S.Katsumoto, Y.Iye: "Observation of an enhanced Aharonov-Bohm effect"Journal of Physics and Chemistry of Solids. (to be published).

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Hara, A.Endo, S.Katsumoto, Y.Iye: "Magnetotransport in 2DEG with magnetic barriers"Physica E. (to be published).

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Iye, A.Endo, S.Katsumoto, Y.Ohno, S.shimomura, S.Hiyamizu: "Suppression of exchange enhancement of spin gap in quantum Hall systems by ultra-short period lateral superlattice"Journal of Physics and Chemistry of Solids. (to be published).

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2020-05-15  

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