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arXiv 0704.0582math.PRmath-phmath.MP
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无序的连续界面:即使是强钉扎在二维中也太弱了

Continuous interfaces with disorder: Even strong pinning is too weak in 2 dimensions

C. Kuelske, E. Orlandi

摘要:

我们考虑连续高度有效界面的统计力学模型,在高度为零的情况下存在一个三角钉扎。有一个详细的数学理解的脱钉过渡在2维无无序。然后计算界面高度w.r.t.对于任何正的钉扎力,吉布斯测度在体积中保持一致有界,并且当钉扎力趋于零时,吉布斯测度像钉扎力的对数一样发散。在哈密顿量中存在一个淬灭无序项是如何改变这种跃迁的?我们证明了任意弱的随机场项足以击败任意强的二维δ钉扎,并将导致离域。证明是基于一个严格的下界之间的局部磁化和随机场在有限体积的重叠。在2维中,它意味着增长速度比体积快,这与局部化是矛盾的。我们还推导出一个简单的互补不等式,它表明,在高维钉扎网站的分数收敛到一个钉扎力趋于无穷大。

英文摘要:

We consider statistical mechanics models of continuous height effective interfaces in the presence of a delta-pinning at height zero. There is a detailed mathematical understanding of the depinning transition in 2 dimensions without disorder. Then the variance of the interface height w.r.t. the Gibbs measure stays bounded uniformly in the volume for any positive pinning force and diverges like the logarithm of the pinning force when it tends to zero. How does the presence of a quenched disorder term in the Hamiltonian modify this transition? We show that an arbitarily weak random field term is enough to beat an arbitrarily strong delta-pinning in 2 dimensions and will cause delocalization. The proof is based on a rigorous lower bound for the overlap between local magnetizations and random fields in finite volume. In 2 dimensions it implies growth faster than the volume which is a contradiction to localization. We also derive a simple complementary inequality which shows that in higher dimensions the fraction of pinned sites converges to one when the pinning force tends to infinity.

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