Phys. Rev. B 54, R9624–R9627 (1996)Magnetic excitation spectrum of dimerized antiferromagnetic chainsSee Also: Erratum
Motivated by recent measurements on CuGeO3, the spectrum of magnetic excitations of an antiferromagnetic S=1/2 chain with alternating coupling strength is investigated. Wave-vector-dependent magnons and a continuum with square-root behavior at the band edges are found. The spectral density of the continua is calculated. Spin-rotation symmetry fixes the gap of the continuum to be twice the elementary magnon gap. This is in excellent agreement with experimental results. The existence of (anti)bound states of two magnons is predicted: below the continuum a singlet and a triplet, above the continuum a quintuplet. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.54.R9624
DOI:
10.1103/PhysRevB.54.R9624
PACS:
See AlsoErratum: Götz S. Uhrig and H. J. Schulz, Erratum: Magnetic excitation spectrum of dimerized antiferromagnetic chains [Phys. Rev. B 54, R9624 (1996)], Phys. Rev. B 58, 2900 (1998). |
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