1992 Fiscal Year Final Research Report Summary
Exploring Study of Novel Properties in Artificially Stacked Materials Grown by van der Waals Epitaxy
| Project/Area Number |
02102002
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| Research Category |
Grant-in-Aid for Specially Promoted Research
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| Allocation Type | Single-year Grants |
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| Research Institution | University of Tokyo |
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Principal Investigator |
KOMA Atsushi Univ. of Tokyo, Faculty of Science, Professor, 理学部, 教授 (00010950)
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| 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)
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| Project Period (FY) |
1990 – 1992
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| Keywords | van der Waals Epitaxy / Artificially Stacked Materials / STM / Organic Thin Films / Lavered Materials / Modulated Structure / Interface |
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| 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.
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