Integrable versus Non-Integrable Spin Chain Impurity Models
نویسندگان
چکیده
Recent renormalization group studies of impurities in spin-1/2 chains appear to be inconsistent with Bethe ansatz results for a special integrable model. We study this system in more detail around the integrable point in parameter space and argue that this integrable impurity model corresponds to a non-generic multi-critical point. Using previous results on impurities in halfinteger spin chains, a consistent renormalization group flow and phase diagram is proposed. 75.10.-b, 75.10.Jm, 75.30.Hx Typeset using REVTEX
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تاریخ انتشار 1993