Dimensional reduction in quantum spin-21 system on a 71-depleted triangular lattice

Article

关键词: GROUND-STATE;    HEISENBERG-ANTIFERROMAGNET;    CALIFORNIA;    ORDER;   

DOI  :  10.1103/PhysRevB.104.224415

来源: SCIE

【 摘 要 】

We study the magnetism of a quantum spin-21 antiferromagnet on a maple-leaf lattice which is obtained by regularly depleting 71 of the sites of a triangular lattice. Although the interactions are set to be spatially isotropic, the ground state shows a stripe Neel order and the temperature dependence of magnetic susceptibility follows that of the one-dimensional XXZ model with a finite spin gap. We examine the nature of frustration by mapping the low-energy degenerate manifold of states to the fully packed loop-string model on a dual cluster-depleted honeycomb lattice, finding that the order-by-disorder due to quantum fluctuation characteristic of highly frustrated magnets is responsible for the emergent stripes. The excited magnons split into two spinons and propagate in the one-dimensional direction along the stripe, which is reminiscent of the XXZ or Ising model in one dimension. Unlike most of the previously studied dimensional-reduction effects, our case is purely spontaneous as the interactions of the Hamiltonian retain a two-dimensional structure.

【 授权许可】

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