Spin Chains with Periodic Array of Impurities
T. Fukui, N. Kawakami
Abstract
We investigate the spin chain model composed of periodic array of two kinds of spins S1 and S2, which allows us to study the spin chains with impurities as well as the alternating spin chains in a unified fashion. By using the Lieb-Shultz-Mattis theorem, we first study the model rigorously, and then by mapping it to the non-linear sigma model, we extensively investigate low-energy properties with particular emphasis on the competition between the massive and massless phases.
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