Edge states of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange

Details Edge states of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange Edge states of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange

2008-12-18

arxiv.org/abs/0812.3445v3

Phys. Rev. B 79, 205107 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 10 figures

Scientific paper

10.1103/PhysRevB.79.205107

A topological insulator and its spin analogue as a gapped spin liquid have characteristic low energy excitations (edge states) within the gap when the systems have boundaries. This is the bulk-edge correspondence, which implies that the edge states themselves characterize the gapped bulk spin liquid. Based on the general principle, we analyzed the vector chirality phase of the spin-1/2 ladder with ring exchange by using the edge states and the entanglement entropy.

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