Sequential quantum phase transitions in - Heisenberg chains with integer spins (): Quantized Berry phase and valence-bond solids
arXiv:1904.00612 · doi:10.1103/PhysRevB.100.014438
Abstract
On the basis of a Berry-phase analysis, we study the ground state of the - Heisenberg chain for . We find that changes of the Berry phase occur times for spin- systems, indicating the sequential phase transitions. The sequential phase transitions are associated with the change of valence-bond configurations of the ground states. To demonstrate this numerically, we connect the - Heisenberg Hamiltonian with the generalized Affleck-Kennedy-Lieb-Tasaki model, and show that the different phases are connected to the different valence-bond-solid states.
7pages, 7 figures
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