Magnetization plateaus as insulator-superfluid transitions in quantum spin systems

Article

关键词: TRIANGULAR LATTICE;    HEISENBERG-MODEL;    GROUND-STATE;    FIELD;    CAV4O9;    ANTIFERROMAGNET;    CSCUCL3;    CHAIN;   

DOI  :  10.1103/PhysRevB.61.3231

来源: SCIE

【 摘 要 】

We study the magnetization process in two-dimensional S = 1/2 spin systems, to discuss the appearance of a plateau structure. The following three cases are considered: (1) the Heisenberg antiferromagnet and multiple-spin exchange model on the triangular lattice, (2) the Shastry-Sutherland-type lattice [which is a possible model for SrCu2(BO3)(2)], (3) the 1/5-depleted lattice (for CaV4O9). We find in these systems that magnetization plateaus can appear owing to a transition from superfluid to a Mott insulator of magnetic excitations. The plateau states have charge-density-wave order of the excitations. The magnetizations of the plateaus depend on components of the magnetic excitations, the range of the repulsive interaction, and the geometry of the lattice.

【 授权许可】

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