Third Sound in Artificially Prepared Two-Dimensional Modulated Structures
| Project/Area Number |
05452051
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | University of Tokyo |
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Principal Investigator |
KONO Kimitoshi University of Tokyo, Institute for Solid State Physics, Associate Professor, 物性研究所, 助教授 (30153480)
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| Co-Investigator(Kenkyū-buntansha) |
SHIRAHAMA Keiya University of Tokyo, Institute for Solid State Physics, Research Associate, 物性研究所, 助手 (70251486)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥6,400,000 (Direct Cost: ¥6,400,000)
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| Keywords | Penrose lattice / Quasicrystal / Third sound / Quantum liquids / Transmission spectrum / Multiple diffraction |
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| Research Abstract |
Wave phenomena in modulated structures are of general interest not only in the solid state physics but also in physics. Concurrent interests in the phenomena are stimulated by the recent discovery of localization of waves in random media (Anderson localization) and of quasicrystals. The aim of this research is to elucidate the nature of waves in these modulated structures.
In the present experiment transmission spectra of third sound in the Penrose lattice which is a two-dimensional quasiperiodic lattice. Despite the theoretical expectation, the transmission is sensitive to the impinging direction of sound and the spectrum has rich structures. This is due to the finiteness of the sample and hence the result does not conflict with the theory.
Ewald's construction suggests that the transmission is strongly suppressed when more than one spots of the structure factor locate on the same Ewald circle (sphere in three-dimensions). This fact implies that the multiple dffraction is important in this system.
The transmission spectrum of waves in the Penrose lattice is observed for the first time. The importance of the multiple diffraction in the Penrose lattice is emphasized. In the next step of the research the spectra have to be measured in the other mudulated structures than the Penrose lattice, for example, the random lattice.
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Report
(3 results)
Research Products
(15 results)
