Lattice Vibrations and Dispersion Relations near Conical Point in a Hexagonal Lattice

被引：2

作者：

Iwata, Makoto ^{[1
]}

Ishibashi, Yoshihiro ^{[2
]}

机构：

[1] Nagoya Inst Technol, Grad Sch Engn, Dept Engn Phys Elect & Mech, Nagoya, Aichi 4668555, Japan

[2] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2012年 / 81卷 / 11期

基金：

日本学术振兴会;

关键词：

hexagonal lattice; lattice vibration; dispersion relation; conical point; CHARGE; TRANSITIONS; SYMMETRY; LUFE2O4;

D O I：

10.1143/JPSJ.81.114703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dispersion relation of lattice vibrations in a hexagonal lattice is discussed on the basis of a simple model. It is found that there are the wavenumber-independent branches if only the nearest-neighbor interaction is taken into account. By taking the second-nearest-neighbor interaction into account, the origin of the appearance of the wavenumber-independent branches is clarified. At the reciprocal lattice point k = (1/3, 1/3, 0) of the hexagonal lattice, called the conical point, there are degenerate modes postulated from the symmetry, and the displacements of constituent atoms in them are concretely discussed.

引用

页数：6

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