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Midgap States in Antiferromagnetic Heisenberg Chains with a Staggered Field
2005
Physical Review Letters
We study low-energy excitations in antiferromagnetic Heisenberg chains with a staggered field which splits the spectrum into a longitudinal and a transverse branch. Bound states are found to exist inside the field induced gap in both branches. They originate from the edge effects and are inherent to spin-chain materials. The sine-Gordon scaling h_s^2/3| h_s|^1/6 (h_s: the staggered field) provides an accurate description for the gap and midgap energies in the transverse branch for S=1/2 and the
doi:10.1103/physrevlett.94.217207
pmid:16090347
fatcat:sdocvig4tnatlfwkeozbiovlja