From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains
We reconsider the excitation spectra of a dimerized and frustrated antiferromagnetic Heisenberg chain. This model is taken as the simpler example of competing spontaneous and explicit dimerization relevant for spin-Peierls compounds. The bosonized theory is a two-frequency sine-Gordon field theory....
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todo:paper_10980121_v59_n13_p8660_Dobry2023-10-03T16:05:36Z From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains Dobry, A. We reconsider the excitation spectra of a dimerized and frustrated antiferromagnetic Heisenberg chain. This model is taken as the simpler example of competing spontaneous and explicit dimerization relevant for spin-Peierls compounds. The bosonized theory is a two-frequency sine-Gordon field theory. We analyze the excitation spectrum by semiclassical methods. The elementary triplet excitation corresponds to an extended magnon whose radius diverges for vanishing dimerization. The internal oscillations of the magnon give rise to a series of excited states until another magnon is emitted and a two-magnon continuum is reached. We discuss, for weak dimerization, the manner in which the magnon forms as a result of a spinon-spinon interaction potential. © 1999 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v59_n13_p8660_Dobry |
| institution |
Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
We reconsider the excitation spectra of a dimerized and frustrated antiferromagnetic Heisenberg chain. This model is taken as the simpler example of competing spontaneous and explicit dimerization relevant for spin-Peierls compounds. The bosonized theory is a two-frequency sine-Gordon field theory. We analyze the excitation spectrum by semiclassical methods. The elementary triplet excitation corresponds to an extended magnon whose radius diverges for vanishing dimerization. The internal oscillations of the magnon give rise to a series of excited states until another magnon is emitted and a two-magnon continuum is reached. We discuss, for weak dimerization, the manner in which the magnon forms as a result of a spinon-spinon interaction potential. © 1999 The American Physical Society. |
| format |
JOUR |
| author |
Dobry, A. |
| spellingShingle |
Dobry, A. From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains |
| author_facet |
Dobry, A. |
| author_sort |
Dobry, A. |
| title |
From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains |
| title_short |
From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains |
| title_full |
From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains |
| title_fullStr |
From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains |
| title_full_unstemmed |
From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains |
| title_sort |
from spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains |
| url |
http://hdl.handle.net/20.500.12110/paper_10980121_v59_n13_p8660_Dobry |
| work_keys_str_mv |
AT dobrya fromspinonstomagnonsinexplicitandspontaneouslydimerizedantiferromagneticchains |
| _version_ |
1807315885935820800 |