Quasi-periodic spin chains in a magnetic field
arXiv:cond-mat/0104082 · doi:10.1103/PhysRevB.64.134419
Abstract
We study the interplay between a (quasi) periodic coupling array and an external magnetic field in a spin-1/2 XXZ chain. A new class of magnetization plateaux are obtained by means of Abelian bosonization methods which give rise to a sufficient quantization condition. The investigation of magnetic phase diagrams via exact diagonalization of finite clusters finds a complete agreement with the continuum treatment in a variety of situations.
4 pages RevTeX, 5 PostScript figures included. Final version to appear in PRB
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