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Quantized Berry Phases of a Spin-1/2 Frustrated Two-Leg Ladder with Four-Spin Exchange | | I. Maruyama
; T. Hirano
; Y. Hatsugai
; | | Date: |
18 Jul 2008 | | Abstract: | A spin-1/2 frustrated two-leg ladder with four-spin exchange interaction is
studied by quantized Berry phases. We found that the Berry phase successfully
characterizes the Haldane phase in addition to the rung-singlet phase, and the
dominant vector-chirality phase. The Hamiltonian of the Haldane phase is
topologically identical to the S=1 antiferromagnetic Heisenberg chain.
Decoupled models connected to the dominant vector-chirality phase revealed that
the local object identified by the non-trivial ($pi$) Berry phase is the
direct product of two diagonal singlets. | | Source: | arXiv, 0807.2896 | | Services: | Forum | Review | PDF | Favorites | |
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