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arXiv 1208.4015math-phcond-mat.str-elhep-thmath.MP
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关于XX自旋链中关联函数的渐近展开

On the asymptotic expansion of the correlators in the XX spin chain

A. A. Ovchinnikov

摘要:

以XX-自旋链为例,我们表明,在一般情况下,在大的距离的相关的渐近展开不是由低的粒子-空穴中间态的总和。只有膨胀的前两项符合Luttinger液体理论的预测。其他项一般由中间态给出,其中粒子和空穴的量子数远离费米点(在链长度的量级的距离处)。我们认为,整个膨胀不能描述的Luttinger液体理论。

英文摘要:

Using the XX- spin chain as an example we show that in general the asymptotic expansion of the correlator at large distances is not given by the sum over the low-lying particle-hole intermediate states. Only the first two terms in the expansion agree with the predictions of the Luttinger liquid theory. The other terms are in general given by the intermediate states with the particles and holes with the quantum numbers far away from the Fermi- points (at the distances of order of the length of the chain). We argue that the whole expansion cannot be described by the Luttinger liquid theory.

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