Alternating spin chains with singlet ground states
Abstract
We investigate low-energy properties of the alternating spin chain model composed of spin s1 and s2 with a singlet ground state. After examining the spin-wave spectrum in detail, we map low-energy spin excitations to the O(3) non-linear sigma model in order to take into account quantum fluctuations. Analyzing the topological term in the resulting sigma model, we discuss how the massless or massive excitations are developed, especially according to the topological nature of the alternating spin system.
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