Experimental simulation methods using artificial two-dimensional electron systems

• Project/Area Number: 15K13367
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Nantoh Masashi 国立研究開発法人理化学研究所, 石橋極微デバイス工学研究室, 専任研究員 (90300889)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 原子操作 / 表面状態 / 二次元電子系 / 周期ポテンシャル / 局所状態密度 / 走査トンネル顕微鏡

Outline of Final Research Achievements

Artificial superstructures of Fe atoms and CO molecules have been fabricated on a Cu(111) surface by atom manipulation with a low temperature scanning tunneling microscope. On the (8 × 8) structure of CO, the spectra measured at the positions corresponding to two equivalent triangular sublattices A and B of a honeycomb show different features near the Fermi level, while this sublattice site dependence is not observed on the (6 × 6) structure. First-principles calculations have reproduced the same tendency. These results can be understood if we consider that the coupling between the surface state and the bulk is strengthen through the scattering process by the adsorbates, and the periodic potential introduced by the CO lattice is perturbed by the second layer of the Cu(111) substrate.

Research Products

• [Journal Article] Impurity-Induced First-order Phase Transitions in Highly Crystalline V2O3 Nanocrystals (2015)
  • Author(s): Y. Ishiwata, E. Takahashi, K. Akashi, M. Imamura, J. Azuma, K. Takahashi, M. Kamada, H. Ishii, Y.-F. Liao, Y. Tezuka, Y. Inagaki, T. Kawae, D. Nishio-Hamane, M. Nantoh, K. Ishibashi , T. Kida
  • Journal Title: Advanced Materials Interfaces Volume: 2 Issue: 12 Pages: 1500132-1500132
  • DOI: 10.1002/admi.201500132
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Artificial Two-dimensional Lattice Structures Assembled by Atom Manipulation Technique (2017)
  • Author(s): M. Nantoh, K. Takashima, T. Yamamoto and K. Ishibashi
  • Organizer: Frontiers in Quantum Materials and Devices Workshop (FQMD 2016)
  • Place of Presentation: 理化学研究所（埼玉県・和光市広沢）
  • Year and Date: 2017-06-13
  • Int'l Joint Research
• [Presentation] Artificial Two-dimensional Lattice Structures Assembled by Atom Manipulation Technique (2017)
  • Author(s): M. Nantoh, K. Takashima, T. Yamamoto and K. Ishibashi
  • Organizer: The 60th International Conference on Electron, Ion, and Photon Beam Technology and Nanofabrication (EIPBN 2016)
  • Place of Presentation: Wyndham Grand Hotel, Pittsburgh, PA, U.S.A.
  • Year and Date: 2017-05-31
  • Int'l Joint Research / Invited
• [Presentation] Formation of Artificial Two-dimensional Electron Systems Using Atom Manipulation Technique (2015)
  • Author(s): M. Nantoh, and K. Ishibashi
  • Organizer: MNC2015 (28th International Microprocesses and Nanotechnology Conference)
  • Place of Presentation: 富山国際会議場
  • Year and Date: 2015-11-10
  • Int'l Joint Research
• [Presentation] 原子操作により形成した仮想グラフェンの電子状態 (2015)
  • Author(s): 南任真史、石橋幸治
  • Organizer: 日本物理学会２０１５年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-16
• [Presentation] ノンドープおよび磁性イオンドープTiO2ナノ粒子の軟Ｘ線発光分光 (2015)
  • Author(s): 石渡洋一、高橋栄光、赤司健太、手塚泰久、稲垣裕次、河江達也、石井啓文、Yen-Fa Liao、木田徹也、南任真史、石橋幸治
  • Organizer: 日本物理学会２０１５年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-16