A hierarchy of exactly solvable spin-1/2 chains with so(N)_1 critical points

Abstract

We construct a hierarchy of exactly solvable spin-1/2 chains with so(N)_1 critical points. Our construction is based on the framework of condensate-induced transitions between topological phases. We employ this framework to construct a Hamiltonian term that couples N transverse field Ising chains such that the resulting theory is critical and described by the so(N)_1 conformal field theory. By employing spin duality transformations, we then cast these spin chains for arbitrary N into translationally invariant forms that all allow exact solution by the means of a Jordan-Wigner transformation. For odd N our models generalize the phase diagram of the transverse field Ising chain, the simplest model in our hierarchy. For even N the models can be viewed as longer ranger generalizations of the XY chain, the next model in the hierarchy. We also demonstrate that our method of constructing spin chains with given critical points goes beyond exactly solvable models. Applying the same strategy to the Blume-Capel model, a spin-1 generalization of the Ising chain in a generic magnetic field, we construct another critical spin-1 chain with the predicted CFT describing the criticality.

24 pages, 5 figures; v2: minor changes and added references

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• Condensate induced transitions between topologically ordered phases
• Class of exactly solvable SO(n) symmetric spin chains with matrix product ground states
• Projected BCS states and spin Hamiltonians for the SO(n)_1 Wess-Zumino-Witten model
• Quantum phase transitions in multileg spin ladders with ring exchange
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• Condensate-induced transitions and critical spin chains

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• Gapless Kitaev Spin Liquid to Classical String Gas through Tensor Networks
• Infinite number of solvable generalizations of XY-chain, with cluster state, and with central charge c=m/2
• Josephson Coupled Moore-Read States
• Anatomy of Fermionic Entanglement and Criticality in Kitaev Spin Liquids
• Quantum criticality in many-body parafermion chains
• Anyonic Liquids in Nearly Saturated Spin Chains
• Abelian and non-Abelian chiral spin liquids in a compact tensor network representation
• Symmetry-protected topological phases, conformal criticalities, and duality in exactly solvable SO($n$) spin chains
• Non-Abelian topological order with SO(5)${}_1$ chiral edge states