Exact two-spinon dynamic structure factor of the one-dimensional s=1/2 Heisenberg-Ising antiferromagnet

Article

关键词: QUANTUM-FIELD-THEORY;    FINITE-SIZE ANALYSIS;    CORRELATION EXPONENTS;    ANTI-FERROMAGNETS;    RAMAN-SCATTERING;    MAGNETIC-FIELD;    XXZ MODEL;    XY-MODEL;    CSCOCL3;    CHAIN;   

DOI  :  10.1103/PhysRevB.57.11429

来源: SCIE

【 摘 要 】

The exact two-spinon part of the dynamic spin structure factor S-xx(Q,omega) for the one-dimensional s=1/2, XXZ model at T=0 in the antiferromagnetically ordered phase is calculated using recent advances in the algebraic analysis based on (infinite-dimensional) quantum group symmetries of this model and the related vertex models. The two-spinon excitations form a two-parameter continuum consisting of two partly overlapping sheets in (Q,omega) space. The spectral threshold has a smooth maximum at the Brillouin zone boundary (Q=pi/2) and a smooth minimum with a gap at the zone center (Q=0). The two-spinon density of states has square-root divergences at the lower and upper continuum boundaries. For the two-spinon transition rates; the two regimes 0 less than or equal to Q0 in the Heisenberg limit and Q(kappa)-->pi/2 in the Ising limit. In the regime Q(kappa)

【 授权许可】

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