Third Sound in Artificially Prepared Two-Dimensional Modulated Structures

人工制备的二维调制结构中的第三种声音

• 批准号: 05452051
• 负责人: KONO Kimitoshi
• 金额: $ 4.54万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452051/
• 关键词: Penrose lattice; Quasicrystal; Third sound; Quantum liquids; Transmission spectrum; Multiple diffraction

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.

调制结构中的波现象不仅在固态物理学，而且在物理学中都具有普遍关注。最近发现在随机培养基（安德森定位）和准晶体中，刺激了波浪的定位，从而刺激了对现象的同时利益。这项研究的目的是阐明这些调制结构中波的性质。在当前的penrose晶格中第三个声音的实验传输光谱，这是二维的准二维晶格。尽管有理论上的期望，但传播对声音的撞击方向敏感，并且光谱具有丰富的结构。这是由于样本的有限性，因此结果与理论没有冲突。欧洲的构造表明，当多个结构因子位于同一ewald圆圈（三维中的球体）上时，透射被强烈抑制。这一事实意味着在该系统中多重dfraction很重要。首次观察到penrose晶格中的波的传输光谱。强调了多重衍射在彭罗斯晶格中的重要性。在研究的下一步中，必须在其他泥浆晶格（例如随机晶格）以外的其他泥浆结构中测量光谱。

项目成果

T.Komuro, H.Kawashima, K.Shirahama: "and K.Kono, Third Sound in One and Two Dimensional Modulated Structures" Journal of Low Temperature Physics. (submitted).

T.Komuro、H.Kawashima、K.Shirahama：“和 K.Kono，一维和二维调制结构中的第三声音”《低温物理学杂志》。

K.Kono: "Third Sound Propagation in Quasicrystals" Physica B. (in press).

K.Kono：“准晶体中的第三声音传播”Physica B.（正在出版）。

T.Komuro,H.Kawashima,K.Shirahama,and K.Kono: "Third Sound in One and Two Dimensional Modulated Structures" Journal of Low Temperature Physics. (投稿中).

T. Komuro、H. Kawashima、K. Shirahama 和 K. Kono：“一维和二维调制结构中的第三声音”《低温物理学杂志》（进行中）。

K.Kono: "Third Sound Transmission Through Non-Periodic Lattices" Phonon Scattering in Cpndensed Matter VII,edited by M.Meiss-ner and R.O.Pohl (Springer-Verlag Berlin Heidelberg). 430-431 (1993)

K.Kono：“通过非周期晶格的第三次声音传输”凝聚态物质中的声子散射 VII，由 M.Meiss-ner 和 R.O.Pohl 编辑（Springer-Verlag Berlin Heidelberg）。

K.Kono: "Third Sound Transmission Through Non-Periodic Lattices" Phonon Scattering in Condensed Matter VII,edited by M.Meissner and R.O.Pohl (Springer-Verlag Berlin Heidelberg). 430-431 (1993)

K.Kono：“通过非周期性晶格的第三次声音传输”凝聚态物质中的声子散射 VII，由 M.Meissner 和 R.O.Pohl 编辑（Springer-Verlag Berlin Heidelberg）。