Dynamical structure factor of the J(1)-J(2) Heisenberg model in one dimension: The variational Monte Carlo approach

Article

关键词: GROUND-STATE;    SPIN;    CHAIN;    SPECTRUM;   

DOI  :  10.1103/PhysRevB.97.235103

来源: SCIE

【 摘 要 】

The dynamical spin structure factor is computed within a variational framework to study the one-dimensional J(1)-J(2) Heisenberg model. Starting from Gutzwiller-projected fermionic wave functions, the low-energy spectrum is constructed from two-spinon excitations. The direct comparison with Lanczos calculations on small clusters demonstrates the excellent description of both gapless and gapped (dimerized) phases, including incommensurate structures for J(2)/J(1) > 0.5. Calculations on large clusters show how the intensity evolves when increasing the frustrating ratio and give an unprecedented accurate characterization of the dynamical properties of (nonintegrable) frustrated spin models.

【 授权许可】

Free