期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 25, 页码 5880-5883出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.5880
关键词
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A breather excitation is observed directly by electron spin resonance in the quantum spin chain Cu benzoate, in which an unexpected field-induced gap has recently been found. The nonlinear field dependence of the resonance field agrees well with the formula based on a quantum sine-Gordon model. The power-law temperature dependence of the linewidth is observed in the gapless spinon regime while the width decreases exponentially for the gapped breather regime. In the intermediate range, a distinct anomaly is found, which is the manifestation of the spinon-breather dynamical crossover.
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