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- W1973771091 abstract "We discuss a general treatment based on the mean field plus random phase approximation (RPA) for the evaluation of subsystem entropies and negativities in ground states of spin systems. The approach leads to a tractable general method, becoming straightforward in translationally invariant arrays. The method is examined in arrays of arbitrary spin with $XYZ$ couplings of general range in a uniform transverse field, where the RPA around both the normal and parity breaking mean field state, together with parity restoration effects, are discussed in detail. In the case of a uniformly connected $XYZ$ array of arbitrary size, the method is shown to provide simple analytic expressions for the entanglement entropy of any global bipartition, as well as for the negativity between any two subsystems, which become exact for large spin. The limit case of a spin $s$ pair is also discussed." @default.
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- W1973771091 date "2010-11-29" @default.
- W1973771091 modified "2023-09-25" @default.
- W1973771091 title "Evaluation of ground-state entanglement in spin systems with the random phase approximation" @default.
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- W1973771091 doi "https://doi.org/10.1103/physreva.82.052332" @default.
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