Making of Dirac Fermion Systems using Semiconductor Superstructures

• Project/Area Number: 23654100
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: OSADA Toshihito 東京大学, 物性研究所, 准教授 (00192526)
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: メゾスコピック系 / 局在ディラック電子系 / ディラック電子 / 半導体超微細化 / 半導体バンド設計 / 量子輸送現象 / ディラック電子系 / 半導体超格子 / アンチドット格子

Research Abstract

The purpose of this research was to realize the 2D massless Dirac fermion system in the semiconductor lateral superlattice structure. As the first step, we have tried to realize the2D Bloch electron system with the reconstructed mini-band structure. We prepared the GaAs/AlGaAs FET devices with the laterally modulated gate electrode. The array of holes are fabricated on the ZEP gate insulating layer with the typical period of 60-80nm. The experimental results have not shown the sign of the band-reconstruction. The randomness of the array is an issue in the feature.

Research Products

• [Journal Article] Magnetotransport in organic Dirac fermion system at the quantum limit: Interlayer Hall effect and surface transport via helical edge states (2012)
  • Author(s): Toshihito Osada
  • Journal Title: Phys. Status Solidi B249 Volume: No.5 Pages: 962-966
  • Peer Reviewed
• [Journal Article] Specific Heat of the Multilayered Massless Dirac Fermion System (2012)
  • Author(s): Takako Konoike, Kazuhito Uchida, and Toshihito Osada
  • Journal Title: J. Phys. Soc. Jpn. 81 Volume: No.4 Issue: 4 Pages: 043601-043601
  • DOI: 10.1143/jpsj.81.043601
  • NAID: 210000109469
  • Peer Reviewed
• [Journal Article] Specific heat study of massless Dirac fermion system α-(BEDT-TTF)2I3 under pressure (2012)
  • Author(s): T. Konoike, K. Uchida, and T. Osada
  • Journal Title: Phys. Status Solidi C 9 Volume: No.5 Issue: 5 Pages: 1177-1179
  • DOI: 10.1002/pssc.201100663
  • Peer Reviewed
• [Journal Article] Magnetotransport in organic Dirac fermion system at the quantum limit: Interlayer Hall effect and surface transport via helical edge states (2012)
  • Author(s): T. Osada
  • Journal Title: Physica Status Solidi B Volume: 249 Issue: 5 Pages: 962-966
  • DOI: 10.1002/pssb.201100587
  • Peer Reviewed
• [Journal Article] Anomalous Interlayer Hall Effect in Multilayer Massless Dirac Fermion System at the Quantum Limit (2011)
  • Author(s): Toshihito Osada
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80, No.3 Issue: 3 Pages: 033708-033708
  • DOI: 10.1143/jpsj.80.033708
  • NAID: 40018753704
  • Peer Reviewed
• [Journal Article] Magnetotransport of Massless Dirac Fermions in Multilayer Organic Conductors (2011)
  • Author(s): T. Osada, K. Uchida, and T. Konoike
  • Journal Title: J. Phys.: Conf. Ser Volume: 334 Pages: 012049-012049
  • DOI: 10.1088/1742-6596/334/1/012049
  • Peer Reviewed
• [Journal Article] Quantum Hall Transport across Monolayer-Bilayer Boundary in Graphene (2011)
  • Author(s): A. Tsukuda, H. Okunaga, D. Nakahara, K. Uchida, T. Konoike, and T. Osada
  • Journal Title: J. Phys.: Conf. Ser Volume: 334 Pages: 012038-012038
  • DOI: 10.1088/1742-6596/334/1/012038
  • Peer Reviewed
• [Presentation] 「量子極限下有機多層ディラック電子系のエッジ伝導」(27aXN-7) (2013)
  • Author(s): 長田俊人
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学(広島)
• [Presentation] Surface Magnetotransport due to HelicalEdge State in the Organic Dirac Fermion systemat the Quantum Limit (2012)
  • Author(s): T. Osada, M. Sato, K. Uchida, and T. Konoike
  • Organizer: International Symposium on Materials Science Opened by Molecular Degrees of Freedom (MDF2012)
  • Place of Presentation: 宮崎
• [Presentation] 「強磁場下多層ディラック電子系におけるヘリカル表面状態の層間伝導特性II」(19pEB-3) (2012)
  • Author(s): 長田俊人
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学(横浜)
• [Presentation] Surface transport due to helical edge state in the organic Dirac fermion system under high magnetic fields (2012)
  • Author(s): T. Osada, M. Sato, K. Uchida, and T. Konoike
  • Organizer: The 20th International Conference on High Magnetic Fields in Semiconductor Physics (HMF-20)
  • Place of Presentation: Chamonix (France).
• [Presentation] Quantum Hall Ferromagnet with Helical Edge State Observed in an Organic Massless Dirac Fermion System (2012)
  • Author(s): T. Osada, M. Sato, and T. Konoike
  • Organizer: The 6th International Conference on the Fundamental Science of Graphene and Applications of Graphene-Based Devices (Graphene Week 2012)
  • Place of Presentation: Delft (Netherland)
• [Presentation] 「強磁場下多層ディラック電子系におけるヘリカル表面状態の層間伝導特性」(25aBK-8) (2012)
  • Author(s): 長田俊人
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学(兵庫)
• [Presentation] Surface transport due to helical edge state in the organic Dirac fermion system under high magnetic fields (2012)
  • Author(s): T. Osada
  • Organizer: The 20th International Conference on High Magnetic Fields in Semiconductor Physics (HMF-20)
  • Place of Presentation: Chamonix, France
• [Presentation] Magnetotransport in Organic Dirac Fermion System at the Quantum Limit: Interlayer Hall Effect and Surface Transport via Helical Edge State (2011)
  • Author(s): T. Osada
  • Organizer: The 9th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2011)
  • Place of Presentation: Gniezno (Poland).
• [Presentation] 「低温強磁場における有機多層ディラック 電子系のヘリカル表面状態 II」(21pTR-8) (2011)
  • Author(s): 長田俊人,佐藤光幸,鴻池貴子
  • Organizer: 日本物理学 会2011年秋季大会
  • Place of Presentation: 富山大学(富山)
• [Presentation] 「グラフェン接合系における量子ホール端伝導」(23pTE-7) (2011)
  • Author(s): 長田俊人
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学(富山)
• [Presentation] Quantum Hall Transport in Monolayer-Bilayer Graphene Heterojunction (2011)
  • Author(s): T. Osada, A. Tsukuda, H. Okunaga, and K. Uchida
  • Organizer: The 19th International Conference on ElectronicProperties of Two-Dimensional Systems (EP2DS19)
  • Place of Presentation: Tallahassee (USA).
• [Presentation] Interlayer Magnetotransport of Massless Dirac Fermions in Zerogap Organic Conductors (2011)
  • Author(s): T. Osada
  • Organizer: The 19th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS19)
  • Place of Presentation: Tallahassee (USA)
• [Book] 「グラフェンの機能と応用展望II」(斉木 幸一郎監修)第 16 章「グラフェンの量子ホール伝導」 (2012)
  • Author(s): 長田俊人
  • Publisher: シーエム シー出版
• [Book] グラフェンの機能と応用展望II（第16章「グラフェンの量子ホール伝導」） (2012)
  • Author(s): 長田俊人
  • Total Pages: 16
  • Publisher: シーエムシー出版
• [Remarks]
  • URL: http://osada.issp.u-tokyo.ac.jp/
• [Remarks] 長田研究室ホームページ
  • URL: http://osada.issp.u-tokyo.ac.jp/