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Electron spin resonance shifts inS=1antiferromagnetic chains
2013
Physical Review B
We discuss electron spin resonance (ESR) shifts in spin-1 Heisenberg antiferromagnetic chains with a weak single-ion anisotropy based on several effective field theories, the O(3) nonlinear sigma model (NLSM) in the Haldane phase, free fermion theories around the lower and the upper critical fields. In the O(3) NLSM, the single-ion anisotropy corresponds to a composite operator which creates two magnons at the same time and position. Therefore, even inside a parameter range where free magnon
doi:10.1103/physrevb.87.125122
fatcat:ppipkukzjvfpvpdtjczqfw2y74