String and conventional order parameters in the solvable modulated quantum chain

Article

关键词: HIDDEN Z(2)XZ(2) SYMMETRY;    BLOCK TOEPLITZ MATRICES;    PHASE-TRANSITIONS;    HEISENBERG LADDER;    SPIN;    BREAKING;    MODEL;    S=1/2;   

DOI  :  10.1103/PhysRevB.100.104428

来源: SCIE

【 摘 要 】

The phase diagram and the order parameters of the exactly solvable quantum one-dimensional model are analyzed. The model in its spin representation is the dimerized XY spin chain in the presence of uniform and staggered transverse fields. In the fermionic representation this model is the dimerized noninteracting Kitaev chain with a modulated chemical potential. The model has a rich phase diagram which contains phases with local and nonlocal (string) orders. We have calculated within the same systematic framework the local order parameters (spontaneous magnetization) and the nonlocal string order parameters, along with the topological winding numbers for all domains of the phase diagram. The topologically nontrivial phase is shown to have a peculiar oscillating string order with the wave number q = pi/2, awaiting for its experimental confirmation.

【 授权许可】

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