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arXiv 0905.4816cond-mat.dis-nncond-mat.stat-mech
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无序SOS模型中的畴壁和混沌

Domain walls and chaos in the disordered SOS model

K. Schwarz, A. Karrenbauer, G. Schehr, H. Rieger

摘要:

对随机衬底上固体-固体模型的畴壁、最优液滴和零温无序混沌进行了数值研究。结果表明,畴壁所代表的随机曲线系综服从Schramm的左通道公式,kappa=4,而它们的分形维数d_s=1.25,因此不能用“随机Loewner演化”(SLE)来描述。横向尺寸在L和2L之间的最佳液滴具有与畴壁相同的分形维数,但是对于L->无穷大,能量在O(1)阶的值处饱和,使得存在仅消耗少量能量的任意大的激发。最后证明了基态对无序中有序度δ的微小变化的敏感性是微妙的:超过一个交叉长度尺度L_delta ~ 1/delta,受扰动的基态与未受扰动的基态的相关性被粗糙度重新标度,被抑制并在数学上接近于零。

英文摘要:

Domain walls, optimal droplets and disorder chaos at zero temperature are studied numerically for the solid-on-solid model on a random substrate. It is shown that the ensemble of random curves represented by the domain walls obeys Schramm's left passage formula with kappa=4 whereas their fractal dimension is d_s=1.25, and therefore is NOT described by "Stochastic-Loewner-Evolution" (SLE). Optimal droplets with a lateral size between L and 2L have the same fractal dimension as domain walls but an energy that saturates at a value of order O(1) for L->infinity such that arbitrarily large excitations exist which cost only a small amount of energy. Finally it is demonstrated that the sensitivity of the ground state to small changes of order delta in the disorder is subtle: beyond a cross-over length scale L_delta ~ 1/delta the correlations of the perturbed ground state with the unperturbed ground state, rescaled by the roughness, are suppressed and approach zero logarithmically.

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