Acoustic breathers in two-dimensional lattices

被引:30
作者
Flach, S [1 ]
Kladko, K [1 ]
Takeno, S [1 ]
机构
[1] OSAKA INST TECHNOL,DEPT INFORMAT SCI,HIRAKATA,OSAKA 57301,JAPAN
关键词
D O I
10.1103/PhysRevLett.79.4838
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We calculate breather solutions for a two-dimensional lattice with one acoustic phonon branch. We start from the case of a system with homogeneous interaction potentials. We then continue the zero-strain breather solution into the model sector. with additional quadratic and cubic potential terms with the help of a generalized Newton method, The breather continues to exist but is dressed with a strain field. In contrast to the ac breather components. which decay exponentially in space, the strain field (which has dipole symmetry) should decay like 1/r(a), a = 2. On our rather small lattice (70 x 70) we find an exponent a approximate to 1.85.
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收藏
页码:4838 / 4841
页数:4
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