Exploration for quantum transport properties of strongly correlated two-dimensional electron gas in ZnO related heterostructures

• Project/Area Number: 23686008
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: Tohoku University (2013); The University of Tokyo (2011-2012)
• Principal Investigator: TSUKAZAKI ATSUSHI 東北大学, 金属材料研究所, 教授 (50400396)
• Project Period (FY): 2011-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥28,340,000 (Direct Cost: ¥21,800,000、Indirect Cost: ¥6,540,000); Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2012: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000); Fiscal Year 2011: ¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000)
• Keywords: 界面 / 量子輸送現象 / 半導体物性 / 結晶工学 / 表面・界面物性 / 量子エレクトロニクス / 強相関エレクトロニクス

Research Abstract

In this research, electron-electron interaction in two-dimensional electron gas in MgZnO/ZnO heterostructures was investigated with applying field-effect gating technique. The heterostructures were grown by molecular-beam epitaxy, whose mobility is now reaching to 800,000cm2V-1s-1. With using cyclotron resonance method, we conclude that the enhancement of the effective mass and g-factor of 2D electrons originates from electron-electron interaction. In addition, a new gating technique with air-gapped structure was applied to MgZnO/ZnO samples, enabling us to reduce 2DEG density with keeping high electron mobility.

Research Products

• [Journal Article] ZnOヘテロ構造を用いた光・電子素子応用への展望 (2014)
  • Author(s): 塚﨑敦、小塚裕介、川﨑雅司
  • Journal Title: 電子情報通信学会誌3月号 Volume: 97 Pages: 227-232
  • Peer Reviewed
• [Journal Article] Surface and interface engineering of ZnO based heterostructures fabricated by pulsed-laser deposition (2014)
  • Author(s): A. Tsukazaki, A. Ohtomo, M. Kawasaki
  • Journal Title: Journal of Physics D : Applied Physics Volume: 47, 034003 Pages: 1-19
  • Peer Reviewed
• [Journal Article] Challenges and opportunities of ZnO-related single crystalline heterostructures (2014)
  • Author(s): Y. Kozuka, A. Tsukazaki, M. Kawasaki
  • Journal Title: Applied Physical Review Volume: 1, 011303 Pages: 1-18
  • Peer Reviewed
• [Journal Article] Challenges and opportunities of ZnO-related single crystalline heterostructures (2014)
  • Author(s): Y. Kozuka, A. Tsukazaki, M. Kawasaki
  • Journal Title: Applied Physics Review Volume: 1 Issue: 1 Pages: 011303-011303
  • DOI: 10.1063/1.4853535
  • Peer Reviewed
• [Journal Article] Surface and interface engineering of ZnO based heterostructures fabricated by pulsed-laser deposition (2014)
  • Author(s): A. Tsukazaki, A. Ohtomo, M. Kawasaki
  • Journal Title: Journal of Physics D: Applied Physics Volume: 47 Issue: 3 Pages: 034003-034003
  • DOI: 10.1088/0022-3727/47/3/034003
  • Peer Reviewed
• [Journal Article] Rashba spin-orbit interactions in a Mg_xZn_<1-x>O/ZnO two-dimensional electron gas studied by electrically-detected electron spin resonance (2013)
  • Author(s): Y. Kozuka, S. Teraoka, J. Falson, A. Oiwa, A. Tsukazaki, S. Tarucha, M. Kawasaki
  • Journal Title: Physical Review B Volume: 87, 205411 Pages: 1-5
  • Peer Reviewed
• [Journal Article] Magneto-photoluminescence of charged excitons from Mg_xZn_<1-x>O/ZnO heterojunctons (2013)
  • Author(s): T. Makino, Y. Segawa, A. Tsukazaki, R. Shen, S. Takeyama, H. Yuji, Y. Nishimoto, S. Akasaka, D. Takamizu, K. Nakahara, T. Tanabe, A. Kamisawa, M. Kawasaki
  • Journal Title: Physical Review B Volume: 87, 085312 Pages: 1-7
  • Peer Reviewed
• [Journal Article] Magneto-photoluminescence of charged excitons from MgxZn1-xO/ZnO heterojunctons (2013)
  • Author(s): T. Makino, Y. Segawa, A. Tsukazaki, R. Shen, S. Takeyama, H. Yuji, Y. Nishimoto, S. Akasaka, D. Takamizu, K. Nakahara, T. Tanabe, A. Kamisawa, M. Kawasaki
  • Journal Title: Physical Review B Volume: 87 Issue: 8
  • DOI: 10.1103/physrevb.87.085312
  • Peer Reviewed
• [Journal Article] Rashba spin-orbit interaction in a MgxZn1-xO/ZnO two-dimensional electron gas studied by electrically detected electron spin resonance (2013)
  • Author(s): Y. Kozuka, S. Teraoka, J. Falson, A. Oiwa, A. Tsukazaki, S. Tarucha, and M. Kawasaki
  • Journal Title: PHYSICAL REVIEW B Volume: 87 Issue: 20
  • DOI: 10.1103/physrevb.87.205411
  • Peer Reviewed
• [Journal Article] Temperature-dependent magnetotransport around v=1/2 in ZnO heterostructures (2012)
  • Author(s): D. Maryenko, J. Falson, Y. Kozuka, A. Tsukazaki, M. Onoda, H. Aoki, M. Kawasaki
  • Journal Title: Physical Review Letters Volume: 108, 186803 Pages: 1-5
  • Peer Reviewed
• [Journal Article] Correlation enhanced effective mass of two-dimensional electrons in Mg_xZn_<1-x>O/ZnO heterostructures (2012)
  • Author(s): Y. Kasahara, Y. Oshima, J. Falson, Y. Kozuka, A. Tsukazaki, M. Kawasaki, Y. Iwasa
  • Journal Title: Physical Review Letters Volume: 109, 246401 Pages: 1-5
  • Peer Reviewed
• [Journal Article] Single-valley quantum Hall ferromagnet in a dilute Mg_xZn_<1-x>O/ZnO strongly correlated two-dimensional electron system (2012)
  • Author(s): Y. Kozuka, A. Tsukazaki, D. Maryenko, J. Falson, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, M. Kawasaki
  • Journal Title: Physical Review B Volume: 85, 075302 Pages: 1-5
  • Peer Reviewed
• [Journal Article] Correlation-Enhanced Effective Mass of Two-Dimensional Electrons in MgxZn1-xO/ZnO Heterostructures (2012)
  • Author(s): Y. Kasahara, Y. Oshima, J. Falson, Y. Kozuka, A. Tsukazaki, M. Kawasaki, Y. Iwasa
  • Journal Title: Physical Review Letters Volume: 109 Issue: 24
  • DOI: 10.1103/physrevlett.109.246401
  • Peer Reviewed
• [Journal Article] Temperature-Dependent Magnetotransport around nu=1/2 in ZnO Heterostructures (2012)
  • Author(s): D. Maryenko, J. Falson, Y. Kozuka, A. Tsukazaki, M. Onoda, H. Aoki, M. Kawasaki
  • Journal Title: Physical Review Letters Volume: 108 Issue: 18
  • DOI: 10.1103/physrevlett.108.186803
  • Peer Reviewed
• [Journal Article] Single-Valley Quantum Hall Ferromagnet in a Dilute Mg_xZn_<1-x>O/ZnO Two-Dimensional Electron System (2012)
  • Author(s): Y.Kozuka, et al.
  • Journal Title: Physical Review B Volume: 85 Issue: 7
  • DOI: 10.1103/physrevb.85.075302
  • Peer Reviewed
• [Journal Article] Insulating phase of a two-dimensional electron gas in Mg_xZn_<1-x>O/ZnO heterostructures below v=1/3 (2011)
  • Author(s): Y. Kozuka, A. Tsukazaki, D. Maryenko, J. Falson, S. Akasaka, K. Nakahara, S. Nakamura, S. Awaji, K. Ueno, M. Kawasaki
  • Journal Title: Physical Review B Volume: 84, 033304 Pages: 1-4
  • Peer Reviewed
• [Journal Article] Insulating phase of a two-dimensional electron gas in MgxZn1-xO/ZnO heterostructures below nu=(1/3) (2011)
  • Author(s): Y.Kozuka, A.Tsukazaki, D.Maryenko, J.Falson, S.Akasaka, K.Nakahara, S.Nakamura, A.Awaji, K.Ueno, M.Kawasaki
  • Journal Title: Physical Review B Volume: 84 Issue: 3 Pages: 33304-33304
  • DOI: 10.1103/physrevb.84.033304
  • Peer Reviewed
• [Presentation] High mobility 2D transport in well-regulated ZnO based wurtzite heterostructures (2013)
  • Author(s): A. Tsukazaki
  • Organizer: MRS Fall meeting
  • Place of Presentation: Boston, USA
  • Year and Date: 2013-12-04
• [Presentation] 酸化物薄膜研究の自由度について (2013)
  • Author(s): 塚崎敦
  • Organizer: 酸化物研究の新機軸に向けた学術討論会
  • Place of Presentation: 宮城県仙台市
  • Year and Date: 2013-11-08
• [Presentation] MgZnO/ZnO界面2次元電子系の量子ホール物理 (2013)
  • Author(s): A. Tsukazaki
  • Organizer: 極限強磁場科学
  • Place of Presentation: 千葉県柏市
  • Year and Date: 2013-11-01
• [Presentation] Polar discontinuity effect in wurtzite ZnO based heterostructures (2013)
  • Author(s): A. Tsukazaki
  • Organizer: JSAP-MRS symposia
  • Place of Presentation: 京都府京田辺市
  • Year and Date: 2013-09-19
• [Presentation] Interface engineering for high mobility 2DEG on polar-oxide semiconductors (2013)
  • Author(s): A. Tsukazaki
  • Organizer: The 40^<th> international symposium on compound semiconductors
  • Place of Presentation: 兵庫県神戸市
  • Year and Date: 2013-05-23
• [Presentation] 高品質ZnO薄膜の作製と酸化物エレクトロニクスへの応用 (2012)
  • Author(s): 塚崎敦
  • Organizer: 第6回物性科学領域横断研究会
  • Place of Presentation: 東京都文京区
  • Year and Date: 2012-11-27
• [Presentation] 酸化物界面における量子ホール効果研究の現状と将来展望 (2012)
  • Author(s): 塚崎敦
  • Organizer: 強磁場コラボラトーが拓く次世代の強磁場サイエンスの展望
  • Place of Presentation: 宮城県仙台市
  • Year and Date: 2012-11-26
• [Presentation] 酸化物半導体ZnOの魅力 (2012)
  • Author(s): 塚崎敦
  • Organizer: 第5回物質科学セミナーin柏
  • Place of Presentation: 千葉県柏市
  • Year and Date: 2012-11-16
• [Presentation] 酸化物ヘテロ界面における2DEG生成と量子ホール効果 (2012)
  • Author(s): 塚崎敦
  • Organizer: 東邦大学物理学科コロキウム
  • Place of Presentation: 千葉県船橋市
  • Year and Date: 2012-06-20
• [Presentation] ZnO系ヘテロ構造における電界効果 (2012)
  • Author(s): 塚崎敦
  • Organizer: 電界効果ワークショップ
  • Place of Presentation: 宮城県仙台市
  • Year and Date: 2012-03-30
• [Presentation] ZnO系ヘテロ構造における電界効果 (2012)
  • Author(s): 塚崎敦
  • Organizer: 電界効果ワークショップ
  • Place of Presentation: 宮城県仙台市(招待講演)
  • Year and Date: 2012-03-30
• [Presentation] MgZnO/ZnO界面における高移動度2次元電子ガスの電界制御と量子輸送現象 (2012)
  • Author(s): 塚崎敦,小塚裕介,ジョセフファルソン,デニスマリエンコ,川崎雅司
  • Organizer: 結晶成長の科学と技術第161委員会第75回研究会,ワイドギャップ半導体光・電子デバイス第162委員会第78回研究会
  • Place of Presentation: 東京都千代田区
  • Year and Date: 2012-03-02
• [Presentation] MgZnO/ZnO界面における高移動度2次元電子ガスの電界制御と量子輸送現象 (2012)
  • Author(s): 塚崎敦, 小塚裕介, ジョセフファルソン, デニスマリエンコ, 川崎雅司
  • Organizer: 結晶成長の科学と技術第161委員会第75回研究会ワイドギャップ半導体光・電子デバイス第162委員会第78回研究会
  • Place of Presentation: 東京都千代田区(招待講演)
  • Year and Date: 2012-03-02
• [Presentation] 酸化物ヘテロ界面における2DEG生成と量子ホール効果 (2012)
  • Author(s): 塚崎 敦
  • Organizer: 東邦大学物理学科コロキウム
  • Place of Presentation: 千葉県船橋市, 東邦大学
  • Invited
• [Presentation] 酸化物半導体ZnOの魅力 (2012)
  • Author(s): 塚崎 敦
  • Organizer: 第5回物質科学セミナーin柏
  • Place of Presentation: 千葉県柏市, 東大柏キャンパス基盤棟2階会議室
  • Invited
• [Presentation] 酸化物界面における量子ホール効果研究の現状と将来展望 (2012)
  • Author(s): 塚崎 敦
  • Organizer: 強磁場コラボラトーが拓く次世代の強磁場サイエンスの展望
  • Place of Presentation: 宮城県仙台市, 東北大学金属材料研究所
  • Invited
• [Presentation] 高品質ZnO薄膜の作製と酸化物エレクトロニクスへの応用 (2012)
  • Author(s): 塚崎 敦
  • Organizer: 第6回物性科学領域横断研究会
  • Place of Presentation: 東京都文京区, 東大本郷キャンパス武田先端知ビル
  • Invited
• [Presentation] Quantum Hall effect in MgZnO/ZnO heterostructures (2011)
  • Author(s): A. Tsukazaki
  • Organizer: 4^<th> International Workshop on Emergent Phenomena in Quantum Hall Systems (EPQHS)
  • Place of Presentation: Beijing, China
  • Year and Date: 2011-06-25
• [Presentation] Quantum Hall effect in MgZnO/ZnO heterostructures (2011)
  • Author(s): A.Tsukazaki
  • Organizer: 4^<th> International Workshop on Emergent Phenomena in Quantum Hall Systems (EPQHS)
  • Place of Presentation: Beijing, China(招待講演)
  • Year and Date: 2011-06-25
• [Presentation] Fractional quantum Hall effect at the MgZnO/ZnO heterointerfaces (2011)
  • Author(s): A. Tsukazaki
  • Organizer: 38^<th> International symposium on Compound Semiconductors (ISCS)
  • Place of Presentation: Berlin, Germany
  • Year and Date: 2011-05-25
• [Presentation] Fractional quantum Hall effect at the MgZnO/ZnO heterointerfaces (2011)
  • Author(s): A.Tsukazaki
  • Organizer: 38^<th> International symposium on Compound Semiconductors (ISCS)
  • Place of Presentation: Berlin, Germany(招待講演)
  • Year and Date: 2011-05-25
• [Presentation] Interface engineering for high mobility 2DEG on polar-oxide semiconductors
  • Author(s): A. Tsukazaki
  • Organizer: The 40th international symposium on compound semiconductors
  • Place of Presentation: 兵庫県神戸市
  • Invited
• [Presentation] 酸化物薄膜研究の自由度について
  • Author(s): A. Tsukazaki
  • Organizer: 酸化物研究の新機軸に向けた学術討論会
  • Place of Presentation: 宮城県仙台市
  • Invited
• [Remarks] 塚﨑研究室HP
  • URL: http://mu.imr.tohoku.ac.jp/researchlist.html