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1992 Fiscal Year Final Research Report Summary

Exploring Study of Novel Properties in Artificially Stacked Materials Grown by van der Waals Epitaxy

Research Project

Project/Area Number 02102002
Research Category

Grant-in-Aid for Specially Promoted Research

Allocation TypeSingle-year Grants
Research InstitutionUniversity of Tokyo

Principal Investigator

KOMA Atsushi  Univ. of Tokyo, Faculty of Science, Professor, 理学部, 教授 (00010950)

Co-Investigator(Kenkyū-buntansha) UENO Keiji  Univ. of Tokyo, Faculty of Science, Research Associate, 理学部, 助手 (40223482)
TADA Hirokazu  Univ. of Tokyo, Faculty of Science, Research Associate, 理学部, 助手 (40216974)
SAIKI Koichiro  Univ. of Tokyo, Faculty of Science, Associate Professor, 理学部, 助教授 (70143394)
AOKI Hideo  Univ. of Tokyo, Faculty of Science, Associate Professor, 理学部, 助教授 (50114351)
Project Period (FY) 1990 – 1992
Keywordsvan der Waals Epitaxy / Artificially Stacked Materials / STM / Organic Thin Films / Lavered Materials / Modulated Structure / Interface
Research Abstract

This project has been fulfillled to create new artificially stacked materials made of highly heterogeneous layrs and to explore novel properties they show. By extending the idea of van der Waals epitaxy developed by us we have succeeded to grow various kinds of heterostructures. The concept of dangling bond termination has made it possible to grow many layred materials on such ordinary three-dimensional materials as GaAs and Si. Good epitaxial films of fullerene and many organic molecular meterials have also been fabricated successfully. Success in heteroepitaxy between lattice-mismatched alkali halides or polar organic materials on alkali halide by using electrostatic interaction has also increased the possible combination of materials in heteroepitaxy. New properties found and investigated in the present project include moiree-type modulation in STM image, polytype and charge density state formations in ultrathin films, control of optical properties of phthalocyanien films by stacking and anomaly in surface polariton dispersion in ultrathin epitaxial films of alkali halides. Crystal growth, crystal structure, electronic properties, superconductivity dielectric properties in the artificially stacked structures have been investigated theoretically by means of Monte Carlo study, Band, calculation, Quantum Monte Carlo study of analytical method. The occurrence of superconductivity due to nonretarded attraction has been demonstrated in a class of repulsively interacting electron systems that consist of a carrier band interacting with an insulting band.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] B.A.Parkinson,F.S.Ohuchi,K.Ueno and A.Koma: "Periodic Lattece Distortions as a Result of Lattice Mismatch Epitaxial Films of Two-Dimensional Materials" Appl.Phys.Lett.58. 472-474 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Tada,T.Kawaguchi and A.Koma: "Epitaxial Growth of Vanady-Phthalocyanine Ultrathin Films on Hidrogen-Terminated Si(111)Surfaces" Appl.Phys.Lett.61. 2021-2023 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Sakurain,H.Tada,K.Saiki A.Koma,H.Funasaka and Y.Kishimoto: "Epitaxial Growth of C_<70> Films on GaSe(0001) and MoS_2(0001) Surfaces" Chem.Phys.Lett.208. 425-430 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shimada,Y.Furukawa,E.Arakawa,K.Takeshita,T.Matsushita,H.Yamamoto and A.Koma: "Structure Determination of Ultrathin NbSe_2 Films by Grazxing Incidence X-ray Diffraction" Solid State Commun.89. 583-586 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kuroki and H.Aoki: "Superconductivity in Metal-Insulator Composite Bands : A Realization of Negative-U Pairing in Purely Repulsive Systems" Phys.Rev.B48. 7598-7617 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Shima and H.Aoki: "Electronic Structure of Superhoneycomb Systems : A Peculiar Realization of Semimetal/Semiconductor Classes and Ferromagnetism" Phys.Rev.Lett.71. 4389-4392 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] B.A.Parkinson, F.S.Ohuchi, K.Ueno and A.Koma: "Periodic Lattice Distortions as a Result of Lattice Mismatch in Epitaxial Films of Two-Dimensional Materials" Appl.Phys.Lett.58. 472-474 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Tada, T.Kawaguchi and A.Koma: "Epitaxial Growth of Vanadyl-Phthalocyanine Ultrathin Films on Hydrogen-Terminated Si (111) Surfaces" Appl.Phys.Lett.61. 2021-2023 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Sakurai, H.Tada, K.Saiki A.Koma, H.Funasaka and Y.Kishimoto: "Epitaxial Growth of C_<60> and C_<70> Films on GaSe (0001) and MoS_2 (0001) Surfaces" Chem.Phys.Lett.208. 425-430 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shimada, Y.Furukawa, E.Arakawa, K.Takeshita, T.Matsushita, H.Yamamoto and A.Koma: "Structure Determination of Ultrathin NbSe2 Films by Grazxing Incidence X-ray Diffraction" Solid State Commun.89. 583-586 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kuroki and H.Aoki: "Superconductivity in Metal-Insulator Composite Bands : A Realization of Negative-U Pairing in Purely Repulsive Systems" Phys.Rev.B48. 7598-7617 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Shima and H.Aoki: "Electronic Structure of Superhoneycomb Systems : A Peculiar Realization of Semimetal/Semiconductor Classes and Ferromagnetism" Phys.Rev.Lett.71. 4389-4392 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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