量子sine-Gordon自旋链KCuGaF6中的元激发和specific heat
Elementary excitations and specific heat in quantum sine-Gordon spin chain KCuGaF6
摘要：
通过比热和电子自旋共振（ESR）测量研究了S = 1/2反铁磁海森堡链KCuGaF 6的元激发.在这种化合物中，由于交替的g张量和具有交替的D矢量的Dzyaloshinsky-Moriya相互作用，在垂直于外场的方向上诱导交错场。这样的自旋系统在外加磁场作用下可以映射到量子sine-Gordon（SG）模型上。比热表明明确的证据，场诱导的差距，这是有关的元激发，孤子和呼吸，量子SG模型的特点。通过高频高场ESR直接观察到了来自孤子和呼吸子的q = 0激发。这些实验结果用量子SG场论很好地描述了。
英文摘要：
Elementary excitations of an S = 1/2 antiferromagnetic Heisenberg chain KCuGaF6 were investigated through specific heat and electron spin resonance (ESR) measurements. In this compound, a staggered field is induced perpendicular to the external field because of the alternating g tensor and the Dzyaloshinsky-Moriya interaction with an alternating D vector. Such a spin system can be mapped onto the quantum sine-Gordon (SG) model, when subjected to the external magnetic field. Specific heat shows clear evidence of the field-induced gap, which is related to the elementary excitations, solitons and breathers, characteristic of the quantum SG model. q = 0 excitations originated from solitons and breathers were directly observed by high-frequency high-field ESR. These experimental results are well described by the quantum SG field theory.
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