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Nonlinear Excitations in an Order‐Parameter‐Preserving Antiferromagnet
Author(s) -
Liu WuMing,
Wang Heng,
Bai FengXiang,
Zhou BenLian
Publication year - 1994
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221820222
Subject(s) - ansatz , nonlinear system , antiferromagnetism , soliton , physics , magnon , dispersion (optics) , order (exchange) , transformation (genetics) , quantum mechanics , condensed matter physics , quantum electrodynamics , statistical physics , chemistry , ferromagnetism , biochemistry , finance , economics , gene
Introducing the Dyson‐Maleev transformation and the coherent state ansatz, soliton‐type nonlinear excitations in an order‐parameter‐preserving antiferromagnet (OPP‐AFM) are investigated with help of the method of multiple scales combined with the long‐wavelength approximation. The soliton frequencies enter into the frequency gap of the linear dispersion curve and denote the nonlinear localized modes of this system. These modes which produce the nonlinearity can be viewed as a two‐magnon bound state.