paper

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

References in corpus (16)

Cited by in corpus (7)