Abstract
Ground-state phase diagram and low-lying excitation spectrum of the one-dimensional S- 1 anisotropic Heisenberg antiferromagnetic chain with nearest neighbor and next nearest neighbor interactions are studied by means of an approximate mapping of the original S=l spin Hamiltonian to the effective fermion Hamiltonian, which describes the dynamics of spin zero defects in antiferromagnetic environments (domain walls in the Neel state). We find that the frustration due to the next nearest neighbor interactions works cooperatively with quantum fluctuation in the Haldane state and stabilizes it. This is naturally explained in terms of the spin zero defect. In addition, we discuss characteristic features of the excitation spectrum in connection with its ground-state properties.
Original language | English |
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Pages (from-to) | 3694-3701 |
Number of pages | 8 |
Journal | journal of the physical society of japan |
Volume | 62 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1993 |
Keywords
- Haldane state
- competing interactions
- domain wall
- spin zero defect
ASJC Scopus subject areas
- Physics and Astronomy(all)