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

Ru Fen Liu, Chia Chu Chen

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)631-645
Number of pages15
JournalPhysica A: Statistical Mechanics and its Applications
Issue number2
Publication statusPublished - 2007 Feb 1

All Science Journal Classification (ASJC) codes

  • Statistics and Probability
  • Condensed Matter Physics


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