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arXiv 0906.4207cond-mat.stat-mech
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Ising量子链中的梯度临界现象:表面行为

Gradient critical phenomena in the Ising quantum chain: surface behaviour

Mario Collura, Dragi Karevski, Loïc Turban

摘要:

我们考虑幂律偏离临界耦合的影响,使得系统在其表面是临界的。我们开发的标度理论表明,这样的扰动引入了一个新的长度尺度,该尺度支配的密度分布的标度行为,以及表面性质的有限大小的行为。对于Ising量子链,当微扰量线性变化时,得到了精确的结果,而二次微扰主要是数值研究。标度理论在这两种情况下都得到了很好的证实。

英文摘要:

We consider the influence of a power-law deviation from the critical coupling such that the system is critical at its surface. We develop a scaling theory showing that such a perturbation introduces a new length scale which governs the scaling behaviour of the density profiles as well as the finite-size behaviour of the surface properties. Exact results are obtained for the Ising quantum chain when the perturbation varies linearly whereas the quadratic perturbation is mainly studied numerically. The scaling theory is well confirmed in both cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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