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Journal of Experimental and Theoretical Physics

The functional-integration method and diagram technique for spin systems

Victor Nikolaevich Popov, S. A. Fedotov

Published Mar 1, 1988• 25 citations
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We study zero temperature properties of a system of two coupled quantum spin chains subject to fields explicitly breaking time reversal symmetry and parity. A suitable choice of the strength of these fields gives a model soluble by Bethe ansatz methods which allows us to determine the complete magnetic phase diagram of the system and the asymptotics of correlation functions from the finite size spectrum. The chiral properties of the system for both the integrable and the nonintegrable case are studied using numerical techniques.