Scalar chiral ground states of spin ladders with four-spin exchanges

Article

关键词: SYMMETRY-BREAKING;    ELEMENTARY EXCITATIONS;    MAGNETIC EXCITATIONS;    TRIANGULAR LATTICE;    QUANTUM;    PHASE;    LIQUID;    MODEL;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.67.174410

来源: SCIE

【 摘 要 】

We show that scalar chiral order can be induced by four-spin exchanges in the two-leg spin ladder, using the spin-chirality duality transformation and matrix-product ansatz. Scalar-chiral-ordered states are found to be exact ground states in a family of spin ladder models. In this scalar chiral phase, there is a finite energy gap above the doubly degenerate ground states and a Z(2)xZ(2)xZ(2) symmetry is fully broken. It is also shown that the SU(4)-symmetric model, which is self-dual under the duality transformation, is on a multicritical point surrounded by the staggered dimer phase, the staggered scalar chiral phase, and the gapless phase.

【 授权许可】

Free