Discrete breathers in a two-dimensional Morse
lattice with an on-site harmonic potential
Discrete breathers in a two-dimensional Morse
lattice with an on-site harmonic potential
Bin-bin LÜ(吕彬彬),Qiang TIAN(田强),
Department
of Physics, Beijing Normal University, Beijing 100875, China;
Abstract ：Two-dimensional discrete breathers in a two-dimensional Morse lattice with on-site harmonic potentials are investigated. Under the harmonic approximation, the linear dispersion relations for the triangular and the square lattices are discussed. The existence of discrete breathers in a two-dimensional Morse lattice with on-site harmonic potentials is proved by using local inharmonic approximation and the numerical method. The localization and amplitude of two-dimensional discrete breathers correlate closely to the Morse parameter a and the on-site parameter κ .
Key words ：
two-dimensional discrete breathers
triangular lattice
square lattice
Morse lattice
on-site harmonic potential
出版日期: 2009-12-05
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