Stationary self-localized magnons in Heisenberg antiferromagnets

Autor:	Mari Kubota, Kazuko Kawasaki, J. Ohishi, Shozo Takeno
Rok vydání:	1997
Předmět:	Physics Nonlinear system Magnon Quantum mechanics Path integral formulation Coherent states Stationary phase approximation Anisotropy Eigenvalues and eigenvectors Dimensionless quantity
Zdroj:	Physical Review B. 55:8812-8820
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.55.8812
Popis:	A path integral method based on the SU(2) coherent state representation is employed to investigate intrinsic stationary self-localized magnons in Heisenberg antiferromagnets. Lagrange equations derived from the stationary phase approximation yield lattice equations in which the intrinsic nonlinearity in the system are incorporated to all orders. The nonlinear eigenvalue problem is solved for a one-dimensional case to show the existence of two types of self-localized modes. Detailed numerical calculations are made to determine their eigenfrequencies and spin profiles as a function of a dimensionless nonlinearity parameter for various values of the anisotropy of exchange interactions and uniaxial anisotropies.
Databáze:	OpenAIRE
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