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• W1996010259 abstract "Frustration-free (FF) spin chains have a property that their ground state minimizes all individual terms in the chain Hamiltonian. We ask how entangled the ground state of a FF quantum spin-s chain with nearest-neighbor interactions can be for small values of s. While FF spin-1/2 chains are known to have unentangled ground states, the case s=1 remains less explored. We propose the first example of a FF translation-invariant spin-1 chain that has a unique highly entangled ground state and exhibits some signatures of a critical behavior. The ground state can be viewed as the uniform superposition of balanced strings of left and right parentheses separated by empty spaces. Entanglement entropy of one half of the chain scales as log(n)/2 + O(1), where n is the number of spins. We prove that the energy gap above the ground state is polynomial in 1/n. The proof relies on a new result concerning statistics of Dyck paths which might be of independent interest." @default.
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• W1996010259 date "2012-11-16" @default.
• W1996010259 modified "2023-10-18" @default.
• W1996010259 title "Criticality without Frustration for Quantum Spin-1 Chains" @default.
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• W1996010259 doi "https://doi.org/10.1103/physrevlett.109.207202" @default.
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