Dynamic properties of quantum spin chains: Simple route to complex behavior

Article

关键词: DZYALOSHINSKII-MORIYA INTERACTION;    DIMENSIONAL XY-MODEL;    FIELD-INDUCED GAP;    MAGNETIC-FIELD;    TRANSVERSE FIELD;    HEISENBERG-ANTIFERROMAGNET;    THERMODYNAMIC PROPERTIES;    TEMPERATURE;    ZERO;   

DOI  :  10.1103/PhysRevB.76.144418

来源: SCIE

【 摘 要 】

We examine dynamic structure factors of spin-1/2 chains with nearest-neighbor interactions of XX and Dzyaloshinskii-Moriya type and with periodic and random changes in the sign of these interactions. This special kind of inhomogeneity can be eliminated from the Hamiltonian by suitable transformation of the spin variables. As a result, the dynamic structure factors of periodic or random chains can be computed from those of the uniform chains. Using the exact analytical and precise numerical results available for the uniform systems, we illustrate the effects of regular alternation or random disorder on dynamic structure factors of quantum spin chains.

【 授权许可】

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