Two-leg SU(2n) spin ladder: A low-energy effective field theory approach

Article

关键词: PHASE-DIAGRAM;    QUANTUM;    SYMMETRY;    MODELS;    PERTURBATIONS;    BOSONIZATION;    CHAINS;   

DOI  :  10.1103/PhysRevB.91.174407

来源: SCIE

【 摘 要 】

We present a field-theory analysis of a model of two SU(2n)-invariant magnetic chains coupled by a generic interaction preserving time-reversal and inversion symmetry. Contrary to the SU(2)-invariant case the zero-temperature phase diagram of such two-leg spin ladder does not contain topological phases. Only generalized valence bond solid phases are stabilized when n > 1 with different wave vectors and ground-state degeneracies. In particular, we find a phase which is made of a cluster of 2n spins put in an SU(2n) singlet state. For n = 3, this cluster phase is relevant to Yb-173 ultracold atoms, with an emergent SU(6) symmetry, loaded in a double-well optical lattice.

【 授权许可】

Free