Generation and Detection of Quantum Correlation in Semiconductor Nanostructures

2010 Fiscal Year Final Research Report

• Project/Area Number: 19674001
• Research Category: Grant-in-Aid for Young Scientists (S)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics I
• Research Institution: Kyoto University
• Principal Investigator: KOBAYASHI Kensuke 京都大学, 化学研究所, 准教授 (10302803)
• Project Period (FY): 2007 – 2010
• Keywords: メゾスコピック系 / 量子雑音

Research Abstract

We have successfully developed a high-sensitive measurement system for current fluctuation in mesoscopic systems, which was applied to measure the dynamical transport through various semiconductor nanostructures such as electron interferometers, quantum dots, and quantum wires. These nanostructures are recently envisaged to be a nice stage to create and detect electronic entanglement. We demonstrated the first experimental test of "fluctuation theorem" in quantum regime and the generation of the polarized nuclear systems. Our achievement convincingly confirms that the precise noise measurement is indispensible to address the entanglement and the nonequilibrium transport phenomena.

Research Products

• [Journal Article] Observation of Full Shot Noise in CoFeB/MgO/CoFeB-based Magnetic Tunneling Junctions (2010)
  • Author(s): Koji Sekiguchi, Tomonori Arakawa, Yoshiaki Yamauchi, Kensaku Chida, Masaki Yamada, Hiromasa Takahashi, Daichi Chiba, Kensuke Kobayashi, and Teruo Ono
  • Journal Title: Applied Physics Letters Volume: 96 Pages: 252504-1-252504-3
  • Peer Reviewed
• [Journal Article] Temperature dependence of the visibility in an electronic Mach-Zehnder inter fero meter (2010)
  • Author(s): Masayuki Hashisaka, Andreas Helzel, Shuji Nakamura, Leonid Litvin, Yoshiaki Yamauchi, Kensuke Kobayashi, Teruo Ono, Hans-Peter Tranitz, Werner Wegscheider, Christoph Strunk
  • Journal Title: Physical E Volume: 42 Pages: 1091-1094
  • Peer Reviewed
• [Journal Article] None quilibrium Fluctuation Relations in a Quantum Coherent Conductor (2010)
  • Author(s): Shuji Nakamura, Yoshiaki Yamauchi, Masayuki Hashisaka, Kensaku Chida, Kensuke Kobayashi, Teruo Ono, RenaudLeturcq, Klaus Ensslin, Keiji Saito, Yasuhiro Utsumi, and Arthur C. Gossard
  • Journal Title: Physical Review Letters Volume: 104 Pages: 080602-1-080602-4
  • Peer Reviewed
• [Journal Article] Large positive magne to resistive effect in silicon induced by the space-charge effect (2009)
  • Author(s): Michael P. Delmo, Shinpei Yamamoto, Shinya Kasai, Teruo Ono, and Kensuke Kobayashi
  • Journal Title: Nature Volume: 457 Pages: 1112-1115
  • Peer Reviewed
• [Journal Article] Universality of bias-and temperature-in duced dephasing in ballistic electronic inter fero meters (2009)
  • Author(s): Yoshiaki Yamauchi, Masayuki Hashisaka, Shuji Nakamura, Kensaku Chida, Shinya Kasai, Teruo Ono, Renaud Leturcq, Klaus Ensslin, Daniel C. Driscoll, Arthur C. Gossard, and Kensuke Kobayashi
  • Journal Title: Physical Review B Volume: 79 Pages: 161306-1-161306-4
  • Peer Reviewed
• [Journal Article] Conductance anomaly and Fano factorre duction in quantum point contacts (2009)
  • Author(s): Shuji Nakamura, Masayuki Hashisaka, Yoshiaki Yamauchi, Shinya Kasai, Teruo Ono, and Kensuke Kobayashi
  • Journal Title: Physical Review B Volume: 79 Pages: 2013081-201308-4
  • Peer Reviewed
• [Journal Article] Noise measure ment system at electron temperature down to 20 mK with combinations of the low pass filters (2009)
  • Author(s): Masayuki Hashisaka, Yoshiaki Yamauchi, Kensaku Chida, Shuji Nakamura, Kensuke Kobayashi, and Teruo Ono
  • Journal Title: Review of Scientific Instruments Volume: 80 Pages: 096105-1-096105-2
  • Peer Reviewed
• [Journal Article] Current-controlled magne toresistance in silicon in non-Ohmic transport regimes (2009)
  • Author(s): Michael P. Delmo, Shinya Kasai, Kensuke Kobayashi, Teruo Ono
  • Journal Title: Applied Physics Letters Volume: 95 Pages: 132106-1-132106-3
  • Peer Reviewed
• [Journal Article] Bolometric detection of quantum shotnoise in coupled mesoscopic systems (2008)
  • Author(s): Masayuki Hashisaka, Yoshiaki Yamauchi, Shuji Nakamura, Shinya Kasai, Teruo Ono, and Kensuke Kobayashi
  • Journal Title: Physical Review B Volume: 78 Pages: 241303-1-241303-4
  • Peer Reviewed
• [Presentation] 半導体量子系における非平衡電流雑音 (2011)
  • Author(s): 小林研介
  • Organizer: 第4回DYCEシンポジウム
  • Place of Presentation: 京都大学
  • Year and Date: 2011-01-06
• [Presentation] 半導体量子系における『ゆらぎの定理』の検証実験 (2010)
  • Author(s): 小林研介
  • Organizer: 基研研究会「非平衡系の物理-非平衡ゆらぎと集団挙動-」
  • Place of Presentation: 京都大学基礎物理学研究所
  • Year and Date: 20101118-20
• [Presentation] Large Positive Magnetoresistive Effect Induced by the Space-Charge Effect in Silicon (2010)
  • Author(s): Takada, A.
  • Organizer: the 30th International Conference on Physics of Semiconductors
  • Place of Presentation: Seoul, Korea
  • Year and Date: 20100725-30
• [Presentation] 半導体量子系における『ゆらぎの定理』の検証実験 (2010)
  • Author(s): 小林研介
  • Organizer: 古典および量子ダイナミクス・非平衡統計力学に関するワークショップ
  • Place of Presentation: 東京大学弥生キャンパス
  • Year and Date: 20100212-14
• [Presentation] Non-e quilibrium Noise in Mesoscopic Systems (2010)
  • Author(s): Kensuke Kobayashi
  • Organizer: Global COE seminar
  • Place of Presentation: University of Tokyo
  • Year and Date: 2010-10-14
• [Presentation] 半導体メゾスコピック系における電子および核スピン依存量子伝導 (2009)
  • Author(s): 小林研介
  • Organizer: 第14回半導体スピン工学の基礎と応用(PASPS-14)「半導体スピントロニクスの展開」
  • Place of Presentation: 慶応大学日吉キャンパス
  • Year and Date: 20091221-22
• [Presentation] Large Positive Magne to resistive Effect Induced by the Space-Charge Effect in Silicon (2009)
  • Author(s): Kensuke Kobayashi
  • Organizer: International IMR Workshop on Group IV Spintronics
  • Place of Presentation: Sendai, Japan
  • Year and Date: 20091005-06
• [Presentation] Large Positive Magnetoresistive EffectInduced by the Space-Charge Effect in Silicon (2009)
  • Author(s): Kensuke Kobayashi
  • Organizer: Korean Physical Society Meeting
  • Place of Presentation: Daejon, Korea
  • Year and Date: 2009-04-23
• [Presentation] 半導体メゾスコピック系における電子のコヒーレンスと多体効果の制御に関する研究 (2009)
  • Author(s): 小林研介
  • Organizer: 第3回(2009年)日本物理学会若手奨励賞受賞講演、日本物理学会第64回年次大会
  • Place of Presentation: 立教学院池袋キャンパス
  • Year and Date: 2009-03-28
• [Presentation] Tuning of the Spin-dependent Transport in Quantum Point Contacts (2008)
  • Author(s): Kensuke Kobayashi
  • Organizer: The 23rd Nishinomiya-Yukawa Memorial International Workshop, Spin Transport in Condensed Matter(STCM)
  • Place of Presentation: Kyoto, Japan
  • Year and Date: 20081027-1128
• [Presentation] Coherence and Correlation of Electrons in Quantum Hybrid Systems (2008)
  • Author(s): Kensuke Kobayashi
  • Organizer: Moriond 2008 :"Quantum Transport and Nanophysics"
  • Place of Presentation: La Thuile, Italy
  • Year and Date: 20080308-15
• [Presentation] Detection of shotnoise in coupled mesoscopic systems (2008)
  • Author(s): Kensuke Kobayashi
  • Organizer: International work shop "Interactionand Interference in Nanoscopic Transport
  • Place of Presentation: Dresden, Germany
  • Year and Date: 20080218-23
• [Presentation] 半導体二次元電子系上の量子ポイントコンタクトにおけるスピン依存伝導 (2008)
  • Author(s): 小林研介
  • Organizer: 第1回界面科学研究会
  • Place of Presentation: 岡山大学
  • Year and Date: 2008-12-19
• [Remarks] ホームページ等・京都大学化学研究所小野研究室(代表者が2012年3月まで准教授として在職)
  • URL: http://www.scl.kyoto-u.ac.jp/~ono/onolab/public_html/indexj.html
• [Remarks] アウトリーチ活動「磁石であそぼう」(京都大学宇治キャンパス公開2007、2007年10月20日-21日、京都大学宇治キャンパス)
• [Remarks] 「磁石であそぼう」(京都大学宇治キャンパス公開2008、2008年10月18日-19日、京都大学宇治キャンパス)
• [Remarks] 「磁石であそぼう」(京都大学宇治キャンパス公開2009、2009年10月24日-25日、京都大学宇治キャンパス)
• [Remarks] 「磁石であそぼう」(京都大学宇治キャンパス公開2010、2010年10月23日-24日、京都大学宇治キャンパス)
• [Remarks] 新聞掲載「巨大磁気抵抗効果京大、シリコンで発見磁気センサーに応用も」、日刊工業新聞(2009年2月26日27面)
• [Remarks] 「シリコンにも磁気抵抗効果読み取り装置に応用も」、京都新聞(2009年2月26日29面)
• [Remarks] 「シリコンに磁場おや電気抵抗変化」、朝日新聞(2009年2月26日夕刊9面)
• [Remarks] 「シリコンに高い電圧で巨大磁気抵抗効果」、産経新聞(2009年3月4日21面)
• [Remarks] 「シリコンに磁気抵抗効果京大化学研が発見」読売新聞(2009年3月23日27面)
• [Remarks] 「小林氏、土居氏に湯川・朝永奨励賞」、京都新聞(2010年12月23日22面)
• [Patent(Industrial Property Rights)] 磁気抵抗素子及び磁気感応スイッチ (2010)
  • Inventor(s): 小林研介、小野輝男
  • Industrial Property Rights Holder: 小林研介、小野輝男
  • Industrial Property Number: 特許、 PCT/JP2010/52409
  • Filing Date: 2010-02-18
  • Overseas
• [Patent(Industrial Property Rights)] 磁気抵抗素子及び磁気感応スイッチ (2009)
  • Inventor(s): 小林研介、小野輝男
  • Industrial Property Rights Holder: 小林研介、小野輝男
  • Industrial Property Number: 特許、特願2009-136275
  • Filing Date: 2009-06-05