Spin degree of freedom in two dimensional systems formed at semiconductor surfaces and interfaces

• Project/Area Number: 18340080
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: OKAMOTO Tohru The University of Tokyo, 大学院・理学系研究科, 准教授 (60245371)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥17,410,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥2,610,000); Fiscal Year 2008: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2007: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2006: ¥6,100,000 (Direct Cost: ¥6,100,000)
• Keywords: 低温物性 / 表面・界面物性 / 半導体物性 / 量子閉じ込め

Research Abstract

研究成果は多岐にわたるが代表的なものを2つ挙げる。(1)一原子層以下のFeを吸着させたInAs劈開表面において、2次元電子の磁気抵抗曲線における明瞭なヒステリシスを観測した。さらに詳細な測定を行い、Fe の超薄膜が2次元スピングラスを形成していることを強く示唆する結果を得た。(2)強相関シリコン2次元電子系に対して希釈冷凍機中で磁場方位をその場制御した実験において、ランダウ交差時に擬スピンの強磁性ドメイン構造が形成されることを示す結果を得た。電気伝導の異方性は、面内磁場に直交する方向に伸びたストライプ構造を示唆する。

Research Products

• [Journal Article] Evidence for Two-Dimensional Spin-Glass Ordering in Submonolayer Fe Films on Cleaved InAs Surfaces (2008)
  • Author(s): T.Mochizuki, R. Masutomi and T. Okamoto
  • Journal Title: Physical Review Letters 101
  • Peer Reviewed
• [Journal Article] Electric Transport Properties of the Ising Quantum Hall Ferromagnet in a Si Quantum Well (2008)
  • Author(s): K. Toyama, T. Nishioka, K. Sawano, Y. Shiraki and T. Okamoto
  • Journal Title: Physical Review Letters((also selected by the Virtual Journal of Nanoscale Science and Technology 18 (2), 2008)) 101
  • Peer Reviewed
• [Journal Article] Alkali-metal-induced Fermi-level and two-dimensional electrons at cleaved InAs(110) surfaces (2008)
  • Author(s): M. Minowa, R. Masutomi, T. Mochizuki and T. Okamoto,
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] Hole density and strain dependencies of hole effective mass in compressively strained Ge channel structures (2008)
  • Author(s): K.Sawano, Y. Kunishi, K. Toyama, T.Okamoto, N. Usami, K. Nakagawa and Y. Shiraki
  • Journal Title: Physica E 40 Pages: 2122-2124
  • Peer Reviewed
• [Journal Article] Spin current in the quantum Hall regime detected by dynamic nuclear polarization (2008)
  • Author(s): Y. Komori, S. Sakuma and T. Okamoto
  • Journal Title: Physica E 40 Pages: 1325-1327
  • Peer Reviewed
• [Journal Article] Quantum Hall effect at cleaved surfaces of InAs and InSb (2008)
  • Author(s): R. Masutomi, T.Mochizuki, M. Hio, Y. Tsuji and T. Okamoto
  • Journal Title: Physica E 40 Pages: 1030-1033
  • Peer Reviewed
• [Journal Article] On Effects of Gate Bias on Hole Effective Mass and Mobility in Strained-Ge Channel Structures (2008)
  • Author(s): K.Sawano, Y. Kunishi, Y. Satoh, K. Toyama,T. Okamoto N. Usami, K. Nakagawa and Y. Shiraki
  • Journal Title: Applied Physics Express 1
  • Peer Reviewed
• [Journal Article] Alkali-metal-induced Fermi-level and two-dimensional electrons at cleaved InAs(110) surfaces (2008)
  • Author(s): M. Minowa, R. Masutomi, T. Mochizuki, T. Okamoto
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] Electronic Transport Properties of the Ising Quantum Hall Ferromagnet in a Si Quantum Well (2008)
  • Author(s): K. Toyama, T. Nishioka, K. Sawano, Y. Shiraki, T. Okamoto
  • Journal Title: Physical Review Letters 101
  • Peer Reviewed
• [Journal Article] Evidence for Two-Dimensional Spin-Glass Ordering in Submonolayer Fe Films on Cleaved InAs Surfaces (2008)
  • Author(s): T. Mochizuki, R. Masutomi, T. Okamoto
  • Journal Title: Physical Review Letters 101
  • Peer Reviewed
• [Journal Article] Quantum Hall effect at cleaved surfaces of InAs and InSb (2008)
  • Author(s): R.Masutomi, T.Mochizuki, M.Hio, Y.Tsuji, T.Okamoto
  • Journal Title: Physica E 40 Pages: 1030-1033
  • Peer Reviewed
• [Journal Article] Ettingshausen Effect around a Landau Level Filling Factor ・ = 3 Studied by Dynamic Nuclear Polarization (2007)
  • Author(s): Y. Komori, S. Sakuma and T. Okamoto
  • Journal Title: Physical Review Letters(also selected by the Virtual Journal of Nanoscale Science and Technology 16 (17), 2007) 99
  • Peer Reviewed
• [Journal Article] Fabrication of Ge channels with extremely high compressive strain and their magnetotransport properties (2007)
  • Author(s): K.Sawano, Y. Kunishi, K. Toyama, T.Okamoto, N. Usami, K. Nakagawa and Y. Shiraki
  • Journal Title: Journal of Crystal Growth 301/302 Pages: 339-342
  • Peer Reviewed
• [Journal Article] Quantum Hall effect at cleaved InSb surfaces and low-temperature annealing effect (2007)
  • Author(s): R. Masutomi, M. Hio, T.Mochizuki and T. Okamoto
  • Journal Title: Applied Physics Letters 90
  • Peer Reviewed
• [Journal Article] Dynamic nuclear polarization induced by hot electrons (2007)
  • Author(s): Y. Komori and T. Okamoto
  • Journal Title: Applied Physics Letters 90
  • Peer Reviewed
• [Journal Article] Ettingshausen Effect around a Landau Level Filling Factor nu=3 Studied by Dynamic Nuclear Polarization (2007)
  • Author(s): Y.Komori, S, Sakuma, T.Okamoto
  • Journal Title: Physical Review Letters 99
  • Peer Reviewed
• [Journal Article] Quantum Hall effect at cleaved InSb surfaces and low-temperature annealing effect (2007)
  • Author(s): R.Masutomi, M.Hio, T.Mochizuki, T.Okalnoto
  • Journal Title: Applied Physics Letters 90
  • Peer Reviewed
• [Journal Article] Dynamic nuclear polarization induced by hot electrons (2007)
  • Author(s): Y.Komori, T.Okamoto
  • Journal Title: Applied Physics Letters 90
• [Journal Article] Magnetotransport properties of Ge channels with extremely high compressive strain (2006)
  • Author(s): K. Sawano, Y.Kunishi, Y. Shiraki, K. Toyama, T.Okamoto, N. Usami and K. Nakawaga
  • Journal Title: Applied Physics Letters(alsoselected by the Virtual Journal of Nanoscale Science and Technology 14 (18), 2006) 89
  • Peer Reviewed
• [Journal Article] Electrically Detected Electron Spin Resonance in a High-Mobility Silicon Quantum Well (2006)
  • Author(s): J. Matsunami, M. Ooya and T. Okamoto
  • Journal Title: Physical Review Letters(also selected by the Virtual Journal of Nanoscale Science and Technology 14 (8), 2006) 97
  • Peer Reviewed
• [Journal Article] Observation of the quantum Hall effect in cleaved InAs surfaces (2006)
  • Author(s): Y. Tsuji, T.Mochizuki and T. Okamoto
  • Journal Title: Physica E 34 Pages: 156-159
  • Peer Reviewed
• [Journal Article] Electron spin resonance of the two-dimensional metallic state and the quantum Hall state in a Si/SiGe quantum well (2006)
  • Author(s): J. Matsunami, M. Ooya and T. Okamoto
  • Journal Title: Physica E 34 Pages: 248-251
  • Peer Reviewed
• [Journal Article] Magnetoresistance in the strongly insulating regime of GaAs two-dimensional hole systems (2006)
  • Author(s): K. Toyama,M. Ooya, T. Okamoto, Y. Hashimoto, S.Katsumoto and Y. Iye
  • Journal Title: Physica E 34 Pages: 697-700
  • Peer Reviewed
• [Journal Article] 半導体劈開表面の2次元電子系と量子ホール効果の観測 (2006)
  • Author(s): 岡本徹、辻幸秀、望月敏
  • Journal Title: 固体物理(依頼を受け執筆) 34 Pages: 339-344
  • NAID: 40007301243
  • Peer Reviewed
• [Journal Article] Observation of the quantum Hall effect in cleaved InAs surfaces (2006)
  • Author(s): Y.Tsuji, T.Mochizuki, T.Okamoto
  • Journal Title: Physica E 34 Pages: 156-159
• [Journal Article] Magnetoresistance in the strongly insulating regime of GaAs two-dimensional hole systems (2006)
  • Author(s): K.Toyama, M.Ooya, T.Okamoto, Y.Hashimoto, S.Katsumoto, Y.Iye
  • Journal Title: Physica E 34 Pages: 697-700
• [Journal Article] Electrically detected electron spin resonance in a high-mobility silicon quantum well (2006)
  • Author(s): J.Matsunami, M.Ooya, T.Okamoto
  • Journal Title: Physical Review Letters 97
• [Journal Article] Magneto transport properties of Ge channels with extremely high compressive strain (2006)
  • Author(s): K.Sawano, Y.Kunishi, Y.Shiraki, K.Toyama, Y.Okamoto, N.Usami, K.Nakawaga
  • Journal Title: Applied Physics Letters 89
• [Journal Article] 半導体劈開表面の2次元電子系と量子ホール効果の観測 (2006)
  • Author(s): 岡本徹, 辻幸秀, 望月敏光
  • Journal Title: 固体物理 41 Pages: 339-344
  • NAID: 40007301243
• [Presentation] Alkali Metal Induced Two Dimensional Electron Systems at Cleaved Surfaces of InAs (2008)
  • Author(s): R. Masutomi, M. Minowa, T. Mochizuki, T. Okamoto
  • Organizer: 29th International Conference on the Physics of Semiconductors
  • Place of Presentation: Rio de Janeiro, Brazil
  • Year and Date: 2008-07-29
• [Presentation] Alkali Metal Induced Two Dimensional Electron Systems at Cleaved Surface of InAs (2008)
  • Author(s): R. Masutomi, M. Minowa, T. Mochizuki and T. Okamoto
  • Organizer: The 29th International Conference on the Physics of Semiconductors
  • Place of Presentation: Rio de Janeiro, Brazil
• [Presentation] Evidence for spin-glass ordering in submonolayer Fe films on InAs (2008)
  • Author(s): T. Mochizuki, R. Masutomi and T. Okamoto
  • Organizer: The 29th International Conference on the Physics of Semiconductors
  • Place of Presentation: Rio deJaneiro, Brazil
• [Presentation] Quantum Hall effect at cleaved surfaces of InAs and InSb (2007)
  • Author(s): R, Masutomi, T.Mochizuki, M.Hio, Y.Tsuji, T.Okamoto
  • Organizer: 17th International Conference on Electronic Properties of Two-Dimensional Systems
  • Place of Presentation: Genova
  • Year and Date: 2007-07-20
• [Presentation] Spin current in the quantum Hall regime detected by dynamic nuclear polarization (2007)
  • Author(s): Y. Komori, S. Sakuma and T. Okamoto
  • Organizer: The 17th International Conference on Electronic Properties of Two-Dimensional Systems
  • Place of Presentation: Genova, Italy
• [Presentation] Quantum Hall effect at cleaved surfaces of InAs and InSb (2007)
  • Author(s): R. Masutomi, T. Mochizuki, M. Hio, Y.Tsuji and T. Okamoto
  • Organizer: The 17th International Conference on Electronic Properties of Two-Dimensional Systems
  • Place of Presentation: Genova, Italy
• [Presentation] Magnetotransport of two-dimensional electrons at in situ cleaved InAs surfaces (2006)
  • Author(s): T. Mochizuki, Y. Tsuji, M. Hio and T. Okamoto
  • Organizer: 28th International Conference on the Physics of Semiconductors
  • Place of Presentation: Vienna, Austria
• [Presentation] Electron spin manipulation, detection, and relaxation in a high mobility silicon quantum well (2006)
  • Author(s): J. Matsunami, M. Ooya and T. Okamoto
  • Organizer: 28th International Conference on the Physics of Semiconductors
  • Place of Presentation: Vienna, Austria
• [Book] Electrical Detection of Electron-Spin Resonance in Two-Dimensional Systems
  • Author(s): Junya Matsunami and Tohru Okamoto
  • Publisher: in "Electron Spin Resonance and Related Phenomena in Low-Dimensional Structures", Series : the Topic in Applied Physics, Vol. 115, Ed. Marco Fanciulli, in press
• [Remarks]
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