Recent studies have shown that logarithmic divergence of entanglement entropy as a function of the size of a subsystem is a signature of criticality in quantum models. We demonstrate that the ground-state entanglement entropy of n sites for the ferromagnetic Heisenberg spin- 1/2 chain of the length L in a sector with fixed magnetization y per site grows as 1/2log2fnsL−nd /LgCsyd, where Csyd=2pes14 −y2d.

Logarithmic divergence of the block entanglement entropy for the ferromagnetic Heisenberg model

SALERNO, Mario
2005

Abstract

Recent studies have shown that logarithmic divergence of entanglement entropy as a function of the size of a subsystem is a signature of criticality in quantum models. We demonstrate that the ground-state entanglement entropy of n sites for the ferromagnetic Heisenberg spin- 1/2 chain of the length L in a sector with fixed magnetization y per site grows as 1/2log2fnsL−nd /LgCsyd, where Csyd=2pes14 −y2d.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/1063825
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