Schmidt KP (2004)
Publication Status: Published
Publication Type: Journal article
Publication year: 2004
Publisher: AMERICAN PHYSICAL SOC
Book Volume: 69
Journal Issue: 10
DOI: 10.1103/PhysRevB.69.104417
Spectral densities are calculated for the dimerized and frustrated S=1/2 chain using the method of continuous unitary transformations. The transformation to an effective triplon model is realized in a perturbative fashion up to high orders about the limit of isolated dimers. An efficient description in terms of triplons (elementary triplets) is possible: a detailed analysis of the spectral densities is provided for strong and intermediate dimerization including the influence of frustration. Precise predictions are made for inelastic neutron scattering experiments probing the S=1 sector and for optical experiments (Raman scattering, infrared absorption) probing the S=0 sector. Bound states and resonances influence the important continua strongly. The comparison with the field theoretic results reveals that the sine-Gordon model describes the low-energy features for strong to intermediate dimerization only at critical frustration.
APA:
Schmidt, K.P. (2004). Spectral properties of the dimerized and frustrated S=1/2 chain. Physical Review B, 69(10). https://doi.org/10.1103/PhysRevB.69.104417
MLA:
Schmidt, Kai Phillip. "Spectral properties of the dimerized and frustrated S=1/2 chain." Physical Review B 69.10 (2004).
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