Anomalous domain wall condensation in a modified Ising chain

Article

关键词: GROUND-STATES;    SPIN-PEIERLS;    VALENCE-BOND;    SOLITONS;    FERMIONS;    MODEL;   

DOI  :  10.1103/PhysRevB.99.195132

来源: SCIE

【 摘 要 】

We construct a one-dimensional local spin Hamiltonian with an intrinsically nonlocal, and therefore anomalous, global Z(2) symmetry. The model is closely related to the quantum Ising model in a transverse magnetic field, and contains a parameter that can be tuned to spontaneously break the nonlocal Z(2 )symmetry. The Hamiltonian is constructed to capture the unconventional properties of the domain walls in the symmetry-broken phase. Using uniform matrix product states, we obtain the phase diagram that results from condensing the domain walls. We find that the complete phase diagram includes a gapless phase that is separated from the ordered ferromagnetic phase by a Berezinskii-Kosterlitz-Thouless transition, and from the ordered antiferromagnetic phase by a first-order phase transition.

【 授权许可】

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