Ground-state instabilities and entanglement in the spin-boson model

Ru-Fen Liu and Chia-Chu Chen

Physica A: Statistical Mechanics and its Applications, 2007, vol. 374, issue 2, 631-645

Abstract: Ground-state instabilities of the spin-boson model is studied in this work. The existence of sequential ground-state instabilities is shown analytically for arbitrary detuning in the two-spin system. In this model, extra discontinuities of concurrence (entanglement measure) are found in the finite system, which do not appear in the on-resonant model. The above results remain intact by including extra boson modes. Moreover, by including extra modes, it is found that ground-state entanglement can be obtained and enhanced even in the weak coupling regime.

Keywords: Entanglement; Concurrence; Ground-state instability; Spin-boson model (search for similar items in EconPapers)
Date: 2007
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:374:y:2007:i:2:p:631-645

DOI: 10.1016/j.physa.2006.08.063

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