EXCITATION-SPECTRA OF S=1 ANTIFERROMAGNETIC CHAINS

Article

关键词: SPIN-CORRELATION-FUNCTION;    GROUND-STATE PROPERTIES;    MONTE-CARLO CALCULATION;    QUANTUM ENERGY-GAP;    HEISENBERG CHAIN;    DYNAMICAL PROPERTIES;    T=0;   

DOI  :  10.1103/PhysRevB.50.3045

来源: SCIE

【 摘 要 】

The dynamical structure factor S(Q, omega) of the S = 1 antiferromagnetic Heisenberg chain with length 20 at zero temperature is calculated. The lowest-energy states have the delta-function peak at the region pi > \Q\ > 0.3pi. At \Q\ < 0.3pi the lowest-energy states are the lower edge of the continuum of the scattering state, the strength of which decreases for large systems. This gives a reasonable explanation for the experimental fact that no clear peak is observed at the region Q < 0.3pi. This situation is more apparent for the valence-bond solid state. On the contrary for S = 1/2 antiferromagnetic Heisenberg chain the lowest-energy states are always the edge of the continuum.

【 授权许可】

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