Electric field induced metallic state in oxide channel field-effect transistors

• Project/Area Number: 20840029
• Research Category: Grant-in-Aid for Young Scientists (Start-up)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Osaka University
• Principal Investigator: NAKAMURA Hiroyuki Osaka University, 基礎工学研究科, 特任助教 (90506445)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥3,276,000 (Direct Cost: ¥2,520,000、Indirect Cost: ¥756,000); Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2008: ¥1,716,000 (Direct Cost: ¥1,320,000、Indirect Cost: ¥396,000)
• Keywords: 表面・界面物性 / 誘電体物性 / 強相関エレクトロニクス / 超伝導材料・素子 / 酸化物界面 / トランジスタ / 磁性 / 電界効果 / 反局在 / 金属絶縁体転移 / 酸化物 / 酸化物エレクトロニクス / 弱局在 / スピントロニクス / FET

Research Abstract

Strong spin-orbit coupling effects on electrons induced at transition-metal oxide interface have been investigated by using field-effect transistor (FET) structures. Weak antilocalization of electrons was observed in KTaO_3 interface, whose detailed analysis led to the spin precession length of the order of 10 nm. This extremely short spin precession length could be understood in terms of strong spin-orbit coupling probably coming from Ta 5d conduction bands.

Research Products

• [Journal Article] Threshold electric fields controlled by surface treatments in KTaO3 field-effect transistors (2010)
  • Author(s): H. Nakamura, T. Kimura
  • Journal Title: J. Appl. Phys 107 Pages: 74508-74508
  • Peer Reviewed
• [Journal Article] Electric field tuning of spin-orbit coupling in KTaO3 field-effect transistors (2009)
  • Author(s): H. Nakamura, T. Kimura
  • Journal Title: Phys. Rev. B 80
  • Peer Reviewed
• [Journal Article] Electric field tuning of spin orbit coupling in KTaO3 Field effect transistors (2009)
  • Author(s): H.Nakamura, T.Kimura
  • Journal Title: Physical Review B (Rapid Communication) 80 Pages: 121308-121308
  • Peer Reviewed
• [Presentation] Electric field control spin precession inKTaO3 field-effect transistor (2010)
  • Author(s): H. Nakamura, T. Kimura
  • Organizer: APS March meeting, Portland
  • Place of Presentation: Portland, USA
  • Year and Date: 2010-03-17
• [Presentation] Strong spin-orbit coupling in KTaO_3 field-effect transistors (2010)
  • Author(s): H.Nakamura
  • Organizer: American Physical Society, March meeting
  • Place of Presentation: Portland, America
  • Year and Date: 2010-03-17
• [Presentation] Strong spin-orbit coupling in KTaO3 field-effect transistors" (2009)
  • Author(s): H. Nakamura, T. Kimura
  • Organizer: 16th International Workshop on Oxide Electronics
  • Place of Presentation: Tarragona, Spain
  • Year and Date: 2009-10-05
• [Presentation] Strong spin-orbit coupling in KTaO_3 field-effect transistors (2009)
  • Author(s): H.Nakamura
  • Organizer: 16th International Workshop on Oxide Electronics
  • Place of Presentation: Tarragona, Spain
  • Year and Date: 2009-10-05
• [Presentation] KTaO3界面におけるゲート誘起ラシュバ効果 (2009)
  • Author(s): 中村浩之、木村剛
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-27
• [Presentation] KTaO3界面のゲート誘起ラシュバ効果 (2009)
  • Author(s): 中村浩之
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-27
• [Presentation] KTaO3の電界効果 (2009)
  • Author(s): 中村浩之、木村剛
  • Organizer: 日本物理学会年次大会、
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-27
• [Presentation] KTaO3の電界効果 (2009)
  • Author(s): 中村 浩之
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-27