A two-legged Heisenberg ladder with staggered bonds shifted between the legs hosts a critical point separating a trivial Mott-insulator-like phase from a Haldane-insulator-like topological phase with edge zero modes, string order, and even entanglement spectrum degeneracy.
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Topological phases in two-legged Heisenberg ladders with alternating interactions
A two-legged Heisenberg ladder with staggered bonds shifted between the legs hosts a critical point separating a trivial Mott-insulator-like phase from a Haldane-insulator-like topological phase with edge zero modes, string order, and even entanglement spectrum degeneracy.